Modulating expression of polypeptides via new gene switch expression systems

CROSS-REFERENCE TO RELATED APPLICATION

0001The present application claims the benefit of <patcit id="pcit0001" dnum="US62444775"><text>U.S. provisional Patent Application Nos. 62/444,775 filed January 10, 2017</text></patcit> and <patcit id="pcit0002" dnum="US62464958B"><text>62/464,958 filed February 28, 2017</text></patcit>, which are hereby incorporated by reference in their entirety.

REFERENCE TO SEQUENCE LISTING

0002The present application contains a Sequence Listing which has been filed electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on January 9, 2018, is named 50471_706_601_SL.txt and is 421,163 bytes in size.

INCORPORATION BY REFERENCE

0003All publications, patents, and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference.

BACKGROUND OF THE DISCLOSURE

0004Adoptive T cell immunotherapy using chimeric antigen receptors (CAR) and T-cell receptors (TCR) has been shown to successfully direct killing of tumor cells. While this innovative technology is promising, the administration of modified T cells into tumor bearing individuals has not been without safety issues, for instance tumor lysis and cytokine release syndrome. In addition, expressing CAR or TCR alone may not be sufficient for efficacy and additional expression of cytokines such as IL-2, IL-12, IL-15 or IL-21 may be needed to increase the efficacy of such treatments. However, this may lead to additional safety issues. It is therefore of interest to gain full control over expression of the therapeutic gene(s) of interest following patient administration.

SUMMARY OF THE DISCLOSURE

0005Disclosed herein, in certain embodiments, are systems, methods or compositions comprising gene switch polypeptides and polynucleotides encoding the same.

0006Provided herein is a composition that comprises a polynucleotide encoding gene switch polypeptides for ligand-inducible control of heterologous gene expression, wherein said gene switch polypeptides comprise: (a) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain; and (b) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.

0007Provided herein is a composition that comprises one or more polynucleotides encoding a gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises: (a) a first gene switch polypeptide that comprises a transactivation domain; (b)a second gene switch polypeptide that comprises a DNA binding domain fused to a ligand binding domain; and (c) at least one heterologous gene polypeptide; wherein one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide is connected by a polypeptide linker to another one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide; and wherein said polypeptide linker comprises a cleavable linker or ribosome skipping linker sequence.

0008In some embodiments, the DNA binding domain of any of the compositions as provided herein comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD. In some embodiments, the DNA binding domain of any of the compositions as provided herein has a sequence as shown in SEQ ID NO: 184. In some embodiments, the transactivation domain of any of the compositions as provided herein comprises at least one of a VP16 transactivation domain and a B42 acidic activator transactivation domain. In some embodiments, the transactivation domain of any of the compositions as provided herein has a sequence as shown in SEQ ID NO: 181.

0009In some cases, at least one of the first nuclear receptor ligand binding domain, the second nuclear receptor ligand binding domain, and the ligand binding domain of any of the compositions as provided herein comprises at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, a NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor. In other cases, at least one of the first nuclear receptor ligand binding domain, the second nuclear receptor ligand binding domain, and the ligand binding domain of any of the compositions as provided herein has a sequence as shown in any one of SEQ ID NOs: 185-186. In another case, the first gene switch polypeptide comprises a GAL4 DBD fused to an EcR nuclear receptor ligand binding domain, and said second gene switch polypeptide comprises a VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain. In yet another case, the Gal4 DBD fused to the EcR nuclear receptor ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186 or 187-188, and the VP16 transactivation domain fused to the retinoid receptor X (RXR) nuclear receptor ligand binding domain has a sequence as shown in SEQ ID NO: 183.

0010In some cases, the linker of any of the compositions as provided herein is a cleavable linker, a ribosome skipping linker sequence or an IRES linker. In some cases, the linker is an IRES linker and has a sequence as shown in any one of SEQ ID NOs: 18-19. In other cases, the linker is a cleavable linker or a ribosome skipping linker sequence. In some embodiments, the cleavable linker or the ribosome skipping linker sequence comprises one or more of a 2A linker, p2A linker, T2A linker, F2A linker, E2A linker, GSG-2A linker, GSG linker, SGSG linker, furinlink linker variants and derivatives thereof. In other embodiments, the cleavable linker or said ribosome skipping linker sequence has a sequence as shown in any one of SEQ ID NOs: 146-162.

0011In an embodiment, the polynucleotide or the one or more polynucleotides of any of the compositions as provided herein further encodes an antigen-binding polypeptide. In another embodiment, the antigen-binding polypeptide of any of the compositions as provided herein comprises at least one of a chimeric antigen receptor (CAR) and a T-cell receptor. In other embodiments, the antigen-binding polypeptide comprises a CAR and said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, , h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In another embodiment, the antigen-binding polypeptide comprises a CAR and the CAR has a sequence as shown in any one of SEQ ID NOs: 210-244.

0012In other embodiments, the polynucleotide or the one or more polynucleotides of any of the compositions as provided herein further encodes a cell tag. In some cases, the cell tag comprises at least one of a HER1 truncated variant or a CD20 truncated variant. In other cases, the cell tag has a sequence as shown in any one of SEQ ID NOs: 189-202.

0013In some embodiments, expression of at least one of the first gene switch polypeptide, the second gene switch polypeptide, the antigen-binding polypeptide, and the cell tag of any of the compositions as provided herein is modulated by a promoter, wherein the promoter is a tissue-specific promoter or an EF 1A promoter or functional variant thereof. In some cases, the promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60. In other cases, the promoter is a tissue-specific promoter comprising a T-cell-specific response element. In another case, the tissue-specific promoter comprises one or more NFAT response element(s). In yet another case, the NFAT response element has a sequence as shown in any one of SEQ ID NOs: 51-57.

0014In some examples, any of the compositions as provided herein further comprises a second polynucleotide encoding a heterologous gene polypeptide. In some cases, the heterologous gene polypeptide comprises at least one of a cytokine, a cell tag, and a chimeric antigen receptor (CAR). In some cases, the cytokine comprises a cytokine and said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In other cases, the cytokine is in secreted form. In another case, the cytokine is in membrane-bound form. In yet another case, the cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209.

0015In an embodiment, expression of the at least one heterologous gene polypeptide of any of the compositions as provided herein is modulated by an inducible promoter. In some embodiments, the inducible promoter has a sequence as shown in any of SEQ ID NOs: 40-64. In other embodiments, the inducible promoter is modulated by at least one of the first gene switch polypeptide and the second gene switch polypeptide.

0016Also provided herein is a vector that comprises the polynucleotide(s) of any of the compositions as provided herein. In an embodiment, the vector is a lentivirus vector, a retroviral vector, or a non-viral vector. In another embodiment, the non-viral vector is a Sleeping Beauty transposon.

0017Provided herein is a method of regulating the expression of a heterologous gene in an effector cell, the method comprising: (a) introducing into said effector cell one or more polynucleotides that encode (i) a first gene switch polypeptide that comprises a DNA-binding domain fused to a ligand binding domain, (ii) a second gene switch polypeptide that comprises a transactivation domain, (iii) a heterologous gene polypeptide encoded by said heterologous gene and (iv) a polypeptide linker that comprises a cleavable or ribosome skipping linker sequence, wherein said polypeptide linker connects one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide to another one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide; and (b) contacting said effector cell with a ligand in an amount sufficient to induce expression of said heterologous gene.

0018In an example, at least one of the one or more polynucleotides of the method of regulating the expression of the heterologous gene in the effector cell as provided herein further encodes an antigen-binding polypeptide. In some cases, the antigen-binding polypeptide selectively binds a predetermined cell surface protein of a target cell. In some cases, the target cell is a mammalian cell. In other cases, the target cell is a tumor cell. In some embodiments, the predetermined cell surface protein of the method of regulating the expression of the heterologous gene in the effector cell as provided herein is a tumor antigen. In some cases, the antigen-binding polypeptide selectively binds the predetermined cell surface protein of the target cell prior to contacting the effector cell with the ligand. In some cases, the effector cell is exposed to the predetermined cell surface protein of the target cell for at least 7 days prior to contacting the effector cell with the ligand. In other cases, binding of the predetermined cell surface protein by the antigen-binding polypeptide activates the effector cell. In some embodiments, the method further comprises co-culturing said effector cell with an artificial antigen presenting cell (aAPC) expressing said predetermined cell surface protein, wherein binding of said antigen-binding polypeptide to said predetermined cell surface protein of said aAPC activates said effector cell. In some embodiments, the co-culturing is for at least 7 days, 14 days, 21 days or 28 days. In some cases, the aAPC is a transgenic K562 cell.

0019In other embodiments, the antigen-binding polypeptide in the method of regulating the expression of the heterologous gene in the effector cell as provided herein comprises at least one of a chimeric antigen receptor (CAR) and a T-cell receptor. In another embodiment, the antigen-binding polypeptide comprises a CAR and said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In yet another embodiment, the antigen-binding polypeptide comprises a CAR having a sequence as shown in any one of SEQ ID NOs: 210-244. In some embodiments, the heterologous gene polypeptide comprises the antigen-binding polypeptide.

0020In some cases, at least one of the one or more polynucleotides in the method of regulating the expression of the heterologous gene in the effector cell as provided herein further encodes a cell tag. In some cases, the cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant. In other cases, the cell tag has a sequence as shown in any one of SEQ ID NOs: 189-202. In some cases, the heterologous gene polypeptide comprises the cell tag.

0021In other cases, at least one of the one or more polynucleotides in the method of regulating the expression of the heterologous gene in the effector cell as provided herein further encodes a cytokine. In some cases, the cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In an embodiment, the cytokine is in secreted form. In another embodiment, the cytokine is in membrane-bound form. In yet another embodiment, the cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209. In other embodiments, the heterologous gene polypeptide comprises said cytokine.

0022In an embodiment, expression of the heterologous gene polypeptide in the method of regulating the expression of the heterologous gene in the effector cell as provided herein is modulated by an inducible promoter. In certain embodiments, the inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64.

0023In another embodiment, the DNA-binding domain in the method of regulating the expression of the heterologous gene in the effector cell as provided herein comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD. In yet another embodiment, the DNA binding domain has a sequence as shown in SEQ ID NO: 184.

0024In yet another embodiment, the transactivation domain in the method of regulating the expression of the heterologous gene in the effector cell as provided herein comprises at least one of a VP16 transactivation domain, and a B42 acidic activator transactivation domain. In some cases, the transactivation domain has a sequence as shown in SEQ ID NO: 181. In other embodiments, at least one of said first and second gene switch polypeptides further comprises a response element capable of binding to said DNA-binding domain.

0025In some embodiments, the ligand binding domain in the method of regulating the expression of the heterologous gene in the effector cell as provided herein comprises at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, an NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor. In certain embodiments, the ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186. In certain embodiments, the first gene switch polypeptide comprises a GAL4 DBD fused to an EcR nuclear receptor ligand binding domain, and the second gene switch polypeptide comprises a VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain. In some embodiments, the Gal4 DBD fused to an EcR has a sequence as shown in any one of SEQ ID NOs: 185-186 and said VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain has a sequence as shown in SEQ ID NO: 183.

0026In certain embodiments, the ligand in the method of regulating the expression of the heterologous gene in the effector cell as provided herein comprises at least one of: (2S,3R,5R,9R,10R,13R,14S,17R)-17-[(2S,3R)-3,6-dihydroxy-6-methylheptan-2-yl]-2,3,14-trihydroxy-10,13-dimethyl- 2,3,4,5,9,11,12,15,16,17-decahydro- 1H-cyclopenta[a]phenanthren-6-one; N'-(3,5-Dimethylbenzoyl)-N'-[(3R)-2,2-dimethyl-3-hexanyl]-2-ethyl-3-methoxybenzohydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methylbenzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxybenzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 2-Methoxy-nicotinic acid N-(1-tert-butyl-pentyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(2,2-dimethyl-1-phenylpropyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; and 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide.

0027In some cases, the expression of the heterologous gene in the method of regulating the expression of the heterologous gene in the effector cell as provided herein is reduced or eliminated in the absence of the ligand, as compared to the expression in the presence of the ligand. In certain cases, the expression of said heterologous gene is restored by providing additional amounts of the ligand.

0028In other cases, expression of at least one of the first gene switch polypeptide and the second gene switch polypeptide is modulated by a promoter in the method of regulating the expression of the heterologous gene in the effector cell as provided herein, wherein said promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof. In certain cases, the promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60. In other cases, the promoter is a tissue-specific promoter, and the tissue-specific promoter comprises a T-cell-specific response element. In another case, the tissue-specific promoter comprises one or more NFAT response element(s). In yet another case, the NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57.

0029In certain cases, the one or more polynucleotides of the method of regulating the expression of the heterologous gene in the effector cell as provided herein are comprised within a vector. In some cases, the vector is a lentivirus vector, a retroviral vector, or a non-viral vector. In certain cases, the non-viral vector is a Sleeping Beauty transposon.

0030Provided herein is a gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises one or more expression cassettes, wherein said one or more expression cassettes comprise: (a) a sequence encoding a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain; and (b) a sequence encoding a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain; wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a polypeptide linker.

0031Provided herein is a gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises one or more expression cassettes, wherein said one or more expression cassettes comprise: (a) a sequence encoding a first gene switch polypeptide that comprises a transactivation domain; (b) a sequence encoding a second gene switch polypeptide that comprises a DNA binding domain fused to a ligand binding domain; and (c) a sequence encoding a heterologous gene polypeptide; wherein one of said transactivation domain, DNA binding domain fused to said ligand binding domain, and said heterologous gene polypeptide is connected by a polypeptide linker to another of said transactivation domain, DNA binding domain fused to said ligand binding domain, and said heterologous gene polypeptide, and wherein said polypeptide linker comprises a cleavable or ribosome skipping linker sequence.

0032In some embodiments, the one or more expression cassettes of the gene switch system as provided herein further comprise a sequence encoding a heterologous gene polypeptide. In some embodiments, the one or more expression cassettes further comprise one or more of the following: (a) one or more recombinase attachment sites; and (b) a sequence encoding a serine recombinase. In other embodiments, the one or more expression cassettes further comprise one or more of the following: (a) a non-inducible promoter; and (b) an inducible promoter.

0033In certain embodiments, the DNA binding domain of the gene switch system as provided herein has a sequence as shown in SEQ ID NO: 184. In other embodiments, the transactivation domain of the gene switch system as provided herein has a sequence as shown in SEQ ID NO: 181. In another embodiment, at least one of the first and second nuclear receptor ligand binding domains and the ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186. In certain embodiments, the non-inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64. In certain embodiments, the inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64. In certain embodiments, the polypeptide linker has a sequence as shown in any one of SEQ ID NOs: 146-162. In some embodiments, the polypeptide linker is a cleavable linker, a ribosome skipping linker or an IRES linker with a sequence as shown in any one of SEQ ID NOs: 18-19 and 146-162 .

0034In some examples, the one or more expression cassettes of the gene switch system as provided herein include an expression cassette that comprises a sequence encoding a chimeric antigen receptor (CAR), wherein expression of the chimeric antigen receptor is modulated by a non-inducible promoter. In certain examples, the CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.

0035In other examples, the non-inducible promoter of the gene switch system as provided herein comprises EF1A or a variant thereof. In certain cases, the expression cassette has a sequence as shown in SEQ ID NO: 131. In other cases, the expression cassette further comprises a sequence encoding a cell tag, wherein the cell tag is connected to the CAR by a linker. In some cases, the cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant.

0036In another example, the expression cassette of the gene switch system as provided herein has a sequence as shown in SEQ ID NO: 132. In some embodiments, the expression cassette further comprises a sequence encoding the first gene switch polypeptide and a sequence encoding the second gene switch polypeptide, wherein one of the first and second gene switch polypeptides is connected to the CAR by a linker.

0037In some embodiments, the first and second gene switch polypeptides of the gene switch system as provided herein are connected by said polypeptide linker, and the polypeptide linker is a cleavable linker. In some embodiments, the expression cassette has a sequence as shown in SEQ ID NO: 133. In some embodiments, the first and second gene switch polypeptides are connected by the polypeptide linker, and the polypeptide linker is an IRES linker.

0038In certain embodiments, the expression cassette of the gene switch system as provided herein has a sequence as shown in SEQ ID NO: 134. In other embodiments, the one or more expression cassettes includes an expression cassette that comprises a sequence encoding the heterologous gene polypeptide, wherein expression of said heterologous gene polypeptide is modulated by an inducible promoter. In other embodiments, the heterologous gene polypeptide comprises a cytokine. In some cases, the cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.

0039In another embodiment, the expression cassette of the gene switch system as provided herein has a sequence as shown in SEQ ID NO: 135. In some embodiments, the expression cassette comprises a sequence encoding a second heterologous gene polypeptide, wherein the second heterologous gene polypeptide comprises a cell tag. In certain cases, the cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant. In other cases, the cell tag is connected to the cytokine by a linker. In another case, the expression cassette has a sequence as shown in SEQ ID NO: 136.

0040In some cases, the gene switch system as provided herein is for integrating a heterologous gene in a host cell, wherein upon contacting the host cell with the one or more expression cassettes in the presence of the serine recombinase and the one or more recombinase attachment sites, the heterologous gene is integrated in the host cell. In certain cases, the gene switch system further comprises a ligand, wherein the heterologous gene is expressed in the host cell upon contacting the host cell with the ligand. In certain cases, the host cell is a T cell or an NK cell. In certain cases, the one or more recombinase attachment sites can comprise a phage genomic recombination attachment site (attP) or a bacterial genomic recombination attachment site (attB). In some cases, the serine recombinase can be SF370.

0041In certain cases, the inducible promoter of the gene switch system as provided herein is activated by the transactivation domain. In certain cases, the system is contained in one or more vectors. In certain cases, the system is contained in one vector.

0042Disclosed is a polynucleotide encoding one or more of the components of the gene switch system as provided herein. Also disclosed herein is a vector that comprises the polynucleotide encoding one or more of the components of the gene switch system as provided herein. In certain cases, the vector is any one of a lentivirus vector, a retroviral vector, or a non-viral vector. In certain cases, the vector is a non-viral vector and said non-viral vector is a Sleeping Beauty transposon.

0043Provided herein is a polynucleotide construct that comprises: a polynucleotide that encodes a first gene switch polypeptide, a polynucleotide that encodes a second gene switch polypeptide, and a polynucleotide that encodes a gene of interest (GOI), wherein the polynucleotide that encodes the GOI comprises a continuous open-reading frame (ORF) positioned between the polynucleotide that encodes the first gene switch polypeptide and the polynucleotide that encodes the second gene switch polypeptide, wherein the polynucleotide construct further comprises a polynucleotide that encodes a linker, and wherein said GOI is connected by said linker to each of said first and second gene switch polypeptides.

0044Provided herein is a polynucleotide that comprises at least one of: (i) a first sequence that encodes a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain; and (ii) a second sequence that encodes a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain; wherein expression of at least one of said first sequence and said second sequence is modulated by one or more NFAT response element.

0045Provided herein is a-method of stimulating the proliferation and/or survival of engineered cells, the method comprising: (a) obtaining a sample of cells from a subject, and (b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate said one or more polynucleotides into the genome of said cells, to provide a population of engineered cells; wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.

0046Provided herein is a method of enhancing <i>in vivo</i> persistence of engineered cells in a subject in need thereof, the method comprising: (a) obtaining a sample of cells from a subject, and (b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate the DNA into the genome of said cells, to provide a population of engineered cells; wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.

0047In some embodiments, the transfecting cells in the methods provided herein comprises electroporating the cells. In certain embodiments, at least one polynucleotide of the one or more polynucleotides encodes the gene switch polypeptides, and the at least one polynucleotide is modulated by a promoter, wherein the promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof. In certain cases, the promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60. In certain cases, the promoter is a tissue-specific promoter, and the tissue-specific promoter comprises a T-cell-specific response element. In certain cases, the promoter is a tissue-specific promoter, and the tissue-specific promoter comprises one or more NFAT response element. In certain cases, the NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57. In certain cases, the cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In other cases, the cytokine is in secreted form. In another case, the cytokine is in membrane-bound form. In yet another case, the cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209. In yet another case, the cells are NK cells, NKT cells, T-cells or T-cell progenitor cells.

0048In other cases, the method as provided herein further comprises administering an effective amount of the engineered cells to a subject in need thereof. In certain cases, administering comprises immediately infusing the subject with the engineered cells. In certain cases, the method further comprises administering an effective amount of the ligand to induce expression of the cytokine. In certain cases, the ligand is veledimex. In some cases, the CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In certain cases, the CAR is capable of binding CD19. In certain cases, the CAR is capable of binding CD33. In certain cases, the transposase is salmonid-type Tc1-like transposase. In certain cases, the transposase is SB11 or SB100x transposase. In certain cases, the one or more cell tags comprises at least one of a HER1 truncated variant and a CD20 truncated variant. In certain cases, the one or more cell tags has a sequence as shown in any one of SEQ ID NOs: 189-202.

0049Provided herein is a method of treating a subject with a solid tumor, the method comprising: (a) obtaining a sample of cells from a subject, (b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate the DNA into the genome of said cells, to provide a population of engineered cells; wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker, and (c) administering said population of engineered cells to said subject.

0050In some embodiments, the cytokine in the method of treating comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In some embodiments, the cytokine comprises IL-12. In some embodiments, at least one polynucleotide of the one or more polynucleotides encodes the gene switch polypeptides, and the at least one polynucleotide is modulated by a promoter, wherein the promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof. In some embodiments, the promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60. In certain embodiments, the promoter is a tissue-specific promoter, and the tissue-specific promoter comprises a T-cell-specific response element. In some embodiments, the promoter is a tissue-specific promoter, and the tissue-specific promoter comprises one or more NFAT response element. In some embodiments, the NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57.

0051Also disclosed is an engineered effector cell, wherein said engineered effector cell comprises: (a) a first polynucleotide encoding an engineered receptor construct that selectively binds a predetermined cell surface protein expressed by a target cell; (b) one or more polynucleotides encoding one or more engineered gene switch polypeptides, wherein said engineered gene switch polypeptides comprise one or more of a transactivation domain, a DNA binding domain, and a ligand binding domain; and (c) a heterologous gene under the control of a ligand-inducible promoter modulated by said engineered gene switch polypeptides; wherein said heterologous gene encodes a cytokine.

0052In some embodiments, the target cell is a mammalian cell. In some embodiments, the target cell is a tumor cell. In some embodiments, the cell surface protein is expressed on the surface of said tumor cell. In some embodiments, the cell surface protein is expressed in an artificial antigen-presenting cell (aAPC). In some embodiments, the engineered receptor construct is a chimeric antigen receptor. In some embodiments, the chimeric antigen receptor binds CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2. In some embodiments, the chimeric antigen receptor binds EGFRvIII.

0053In some embodiments, the engineered receptor construct is an engineered T-cell receptor. In some embodiments, the cytokine is IL-2, IL-15, IL-12, IL-21, or a fusion of IL-15 and IL-15Rα. In some embodiments, the cytokine is IL-12. In some embodiments, the effector cell further comprises a polynucleotide encoding a protein comprising a cell tag. In some embodiments, the cell tag is a truncated HER1 variant or a CD20 truncated variant. In some embodiments, the effector cell is an immune effector cell. In some embodiments, the effector cell is a T cell, an NK cell or a tumor infiltrating lymphocyte. In some embodiments, the one or more engineered gene switch polypeptides comprise a transactivation domain, a DNA binding domain and a ligand binding domain. In some embodiments, the one or more engineered gene switch polypeptides comprise a first gene switch polypeptide comprising said DNA-binding domain fused to a nuclear receptor ligand binding domain and a second gene switch polypeptide comprising said transactivation domain fused to a nuclear receptor ligand binding domain.

0054In some embodiments, the first gene switch polypeptide and said second gene switch polypeptide are connected by a polypeptide linker. In some embodiments, the polypeptide linker is a cleavable or ribosome skipping linker sequence. In some embodiments, the polypeptide linker comprises one of 2A, F/T2A, GSG-2A, GSG linker, SGSG linker, furinlink variants and derivatives thereof. In some embodiments, the transactivation domain comprises a VP16 transactivation domain. In some embodiments, the one or more engineered gene switch polypeptides comprise at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, a NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor. In some embodiments, the DNA-binding domain (DBD) comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD.

0055Further disclosed herein is a method of modulating the expression of a heterologous gene, the method comprising contacting the target cell with an effector cell disclosed herein. In some cases, the modulating comprises increasing or decreasing expression of said heterologous gene. In some cases, the expression is reduced or eliminated in the absence of said ligand, as compared to the expression in the presence of said ligand. In some cases, the expression is resuscitated by providing additional amounts of said ligand.

0056Further disclosed is a method of regulating the expression of a heterologous in an effector cell, the method comprising: introducing into said effector cell polynucleotides encoding one or more engineered gene switch polypeptides, an engineered receptor construct, and said heterologous gene; wherein said heterologous gene is under the control of an inducible promoter; activating said effector cell via said engineered receptor construct; and presenting a ligand to said effector cell for inducing expression of said heterologous gene via said one or more engineered gene switch polypeptides after said activating said effector cell.

0057In some cases, the activating comprises contacting the effector cell with an antigen. In some cases, the antigen is a tumor antigen. In some cases, the effector cell is exposed to the tumor antigen for at least 7 days prior to presenting a ligand to the effector cell. In some cases, activating the effector cell comprises co-culturing the effector cell with an artificial antigen presenting cell (aAPC). In some cases, the co-culturing is for at least 7 days, 14 days, 21 days or 28 days. In some cases, the aAPC is a transgenic K562 cell. In some cases, the engineered receptor construct comprises a chimeric antigen receptor (CAR). In some cases, the CAR binds CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, h5T4, PSMA, TAG-72, EGFRvIII, CD123, or VEGF-R2. In some cases, the engineered receptor construct comprises an engineered T-cell receptor (TCR). In some cases, the effector cell comprises contacting the effector cell with a TCR-binding polypeptide. In some cases, the TCR-binding polypeptide comprises a TCR-binding antibody or fragment thereof. In some cases, the effector cell is exposed to the TCR-binding polypeptide for at least 7 days prior to presenting a ligand to the effector cell. In some cases, the TCR-binding polypeptide is expressed by an aAPC. In some cases, the heterologous gene encodes a cytokine. In some cases, the cytokine is IL-2, IL-15, IL-12, IL-21, or a fusion of IL-15 and IL-15Rα. In some cases, the cytokine is IL-12.

0058In some cases, the heterologous gene encodes at least one cell tag. In some cases, the cell tag is a HER1 truncated variant or a CD20 truncated variant. In some cases, the one or more gene expression cassettes further comprise a nucleotide sequence encoding a cell tag. In some cases, the effector cell is an immune effector cell. In some cases, the immune effector cell is a T-cell, an NK cell or a tumor infiltrating lymphocyte. In some cases, the one or more engineered gene switch polypeptides comprise a transactivation domain, a DNA-binding domain, and a ligand-binding domain. In some cases, the ligand-binding domain comprises at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, a NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor. In some cases, the DNA-binding domain comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD. In some cases, the transactivation domain comprises a VP16 transactivation domain.

0059In some cases, the one or more engineered gene switch polypeptides further comprise a response element capable of binding to said DNA-binding domain. In some cases, the one or more engineered gene switch polypeptides further comprise at least one of ultraspiracle protein (USP), retinoid receptor X (RXR), or functional fragments and variants thereof, wherein said functional fragments and variants thereof are capable of binding to an EcR. In some cases, the one or more engineered gene switch polypeptides further comprise one or more polypeptide linkers. In some cases, the one or more polypeptide linkers further comprise at least one of 2A, GSG-2A, GSG linker, SGSG linker, furinlink variants and derivatives thereof. In some cases, the ligand comprises at least one of: (2S,3R,5R,9R,10R,13R,14S,17R)-17- [(2S,3R)-3,6-dihydroxy-6-methylheptan-2-yl]-2,3,14-trihydroxy-10,13-dimethyl-2,3,4,5,9,11,12,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-6-one; N'-(3,5-Dimethylbenzoyl)-N'-[(3R)-2,2-dimethyl-3-hexanyl]-2-ethyl-3-methoxybenzohydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy- benzoyl)-hydrazide; 2-Methoxy-nicotinic acid N-(1-tert-butyl-pentyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(2,2-dimethyl-1-phenyl-propyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; and 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide.

0060Further disclosed herein is a polynucleotide for ligand-inducible control of heterologous gene expression in an engineered cell, wherein said polynucleotide comprises: (a) a first sequence encoding an engineered receptor construct capable of binding a predetermined cell surface protein expressed by a target cell; and (b) a second sequence encoding one or more engineered gene switch polypeptides for ligand-inducible control of said heterologous gene expression by modulating a promoter linked to said heterologous gene in response to the presence of said ligand; wherein said engineered receptor construct and said one or more engineered gene switch polypeptides are connected by a polypeptide linker.

0061In some embodiments, the polypeptide linker comprises a cleavable linker sequence. In some embodiments, the cleavable linker sequence is an F2A linker. In some embodiments, the one or more engineered gene switch polypeptides comprise a first gene switch polypeptide comprising a DNA-binding domain fused to a nuclear receptor ligand binding domain, and a second gene switch polypeptide comprising a transactivation domain fused to a nuclear receptor ligand binding domain. In some embodiments, the first gene switch polypeptide and the second gene switch polypeptide are connected by a linker. In some embodiments, the linker is a cleavable or ribosome skipping linker sequence. In some embodiments, the linker is a 2A linker, GSG-2A linker, GSG linker, SGSG linker, furinlink variants and derivatives thereof. In some embodiments, the 2A linker is an F2A linker. In some embodiments, the heterologous gene encodes a cytokine. In some embodiments, the cytokine is IL-2, IL-15, IL-12, IL-21, or a fusion of IL-15 and IL-15Rα. In some embodiments, the cytokine is IL-12. In some embodiments, the heterologous gene encodes at least one cell tag. In some embodiments, the cell tag is a HER1 truncated variant or a CD20 truncated variant. In some embodiments, the polynucleotide is incorporated into an engineered cell.

0062Further disclosed herein is a system for expressing a cytokine in a host cell in a vicinity of a target cell, wherein the system comprises: (a) the host cell encoding: (i) an engineered receptor construct that selectively binds a predetermined cell surface protein expressed in the target cell; (ii) an engineered gene switch polypeptide, wherein the engineered gene switch polypeptide comprises one or more of a transactivation domain, a DNA-binding domain, and a ligand-binding domain; and (iii) a cytokine expressed from a heterologous gene linked to a promoter modulated by the engineered gene switch polypeptide; and (b) a ligand; such that upon binding of the engineered receptor construct to the cell surface protein in the presence of the ligand, the cytokine is expressed by the host cell in the vicinity of the target cell.

0063In some cases, the engineered receptor construct comprises a chimeric antigen receptor. In some cases, the chimeric antigen receptor binds CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2. In some cases, the chimeric antigen receptor binds EGFRvIII. In some cases, the engineered receptor construct comprises an engineered T-cell receptor. In some cases, the cytokine is IL-2, IL-15, IL-12, IL-21, or a fusion of IL-15 and IL-15Rα. In some cases, the cytokine is IL-12. In some cases, the host cell further encodes at least one cell tag. In some cases, the cell tag is a HER1 truncated variant or a CD20 truncated variant.

0064Further provided for herein is a method of expressing a cytokine from a host cell in the vicinity of a target cell, the method comprising contacting a system disclosed herein the said target cell in the presence of the ligand. Further provided for herein is a method of modulating the expression of a cytokine from a host cell in the vicinity of a target cell, the method comprising contacting a system disclosed herein with the target cell in the presence of the ligand, and regulating the amount of ligand. In some cases, the expression is reduced or eliminated in the absence of said ligand, as compared to expression in the presence of said ligand. In some cases, the expression is resuscitated by providing additional amounts of said ligand. In some cases, the host cell is an animal cell or a mammalian cell. In some cases, the mammalian cell is a human cell. In some cases, the mammalian cell is a T-cell, an NK cell, or a tumor-infiltrating lymphocyte. In some cases, the target cell is a tumor cell. In some cases, the system is contained in one or more vectors. In some cases, each vector comprises a plasmid. In some cases, each vector comprises an expression plasmid. In some cases, each vector is a lentivirus vector, a retroviral vector, or a non-viral vector. In some cases, the non-viral vector comprises a Sleeping Beauty transposase and a SB transposon.

0065Further disclosed herein is a polypeptide for binding to EGFRvIII, wherein the polypeptide comprises a polypeptide sequence which has at least 70%, 75%, 80%, 85%, 90%, 95%, 99% or 99.5% identity to a sequence shown in SEQ ID NOs: 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, or 244.

0066In some cases, the polypeptide is expressed in an engineered effector cell. In some cases, the effector cell is an immune effector cell. In some cases, the immune effector cell is a T-cell, an NK cell or a tumor- infiltrating lymphocyte. In some cases, the polypeptide comprises an antibody or fragment thereof. In some cases, the polypeptide comprises a chimeric antigen receptor (CAR). In some cases, the EGFRvIII binds an scFv antigen-binding domain of said antibody or fragment thereof or said CAR. In some cases, the polypeptide does not cross-react with wild-type EGFR.

0067Further disclosed herein is a polynucleotide encoding: a) an engineered receptor construct capable of binding EGFRvIII; b) a first polypeptide comprising a transactivation domain and a nuclear receptor ligand binding domain; and (c) a second polypeptide comprising a DNA-binding domain and a nuclear receptor ligand binding domain; wherein an F/T2A linker connects at least two of the engineered receptor construct, the first polypeptide and the second polypeptide.

0068In some cases, the F/T2A linker connects said engineered receptor construct to at least one of said first polypeptide and said second polypeptide. In some cases, the F/T2A linker connects the first polypeptide to said second polypeptide. In some cases, the polynucleotide further encodes an IRES linker. In some cases, the IRES linker connects the first polypeptide to the second polypeptide.

0069Further disclosed herein is an effector cell comprising a polynucleotide disclosed herein. In some cases, the effector cell encodes a heterologous gene linked to an inducible promoter capable of being modulated by said first polypeptide or said second polypeptide.

0070Further disclosed herein is a chimeric antigen receptor (CAR) capable of binding EGFRvIII, wherein the CAR comprises: (a) an EGFRvIII-binding region; (b) a transmembrane region; and (c) a spacer region connecting the trans-membrane region with the EGFRvIII binding region, wherein the spacer region comprises a stalk region comprising at least one dimerization site, and a stalk extension region comprising a sequence with at least 75% sequence identity to the stalk region.

0071Further disclosed herein is an engineered effector cell that comprises: (a) an EGFRvIII binding moiety at a surface of said engineered effector cell effective to bind an EGFRvIII molecule or variant thereof; (b) an engineered gene switch polypeptide, wherein the engineered gene switch polypeptide comprises one or more of a transactivation domain, a DNA binding domain, and a ligand binding domain; and (c) a heterologous gene encoding a cytokine, the heterologous gene controlled by a promoter modulated by the engineered gene switch polypeptide.

BRIEF DESCRIPTION OF THE DRAWINGS

0072The features of the present disclosure are set forth with particularity in the appended claims. A better understanding of the features and advantages of the present disclosure will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the disclosure are utilized, and the accompanying drawings of which: <ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001"><b>FIG. 1</b></figref> is a schematic depiction of the Sleeping Beauty (SB) system adapted to genetically modify T cells. DNA plasmids expressing a SB transposon system, <i>i.e.</i> SB11, membrane bound IL-15 (mbIL-15), and chimeric antigen receptor (CAR), are transfected to peripheral blood mononuclear cells (PBMC) to redirect T cell specificity. T cells stably expressing integrants on designer activating and propagating cells (AaPC) are propagated and expanded.</li><li><figref idref="f0002 f0003 f0004 f0005"><b>FIG. 2A-2D</b></figref> schematically illustrate various structural components of diverse ligand-inducible gene switch vector systems. Exemplary CAR as depicted can include CD19 CAR. EF1A promoter is an exemplary constitutive promoter.</li><li><figref idref="f0006"><b>FIG. 3</b></figref> is a schematic illustration of a multiple vector system for ligand-inducible gene switch polypeptides.</li><li><figref idref="f0007"><b>FIG. 4</b></figref> depicts quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 1 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO). Constructs 1, 4, 5, 6, 7 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0008"><b>FIG. 5</b></figref> depicts quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 21 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. Ligand was added 48 hours prior to flow cytometric analysis. Constructs 1, 4, 5, 6 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0009"><b>FIG. 6</b></figref> depicts quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 29 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. The expression of mbIL-15 is turned on post ligand addition. Constructs 1, 4, 5, 6, 7 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0010"><b>FIG. 7</b></figref> shows quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 35 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. The expression of mbIL-15 is turned off post ligand withdrawal. Constructs 1, 4, 5, 6 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0011"><b>FIG. 8</b></figref> shows quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 40 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. The expression of mbIL-15 is maintained after re-introduction of ligand. Constructs 1, 4, 5, 6 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0012"><b>FIG. 9</b></figref> shows quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 48 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. The expression of mbII,-15 is continuously maintained after re-introduction of ligand. Constructs 1, 4, 5, 6 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0013"><b>FIG. 10</b></figref> shows quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, on day 50 of post nucleofection in presence/absence of veledimex ligand (solvent: DMSO), gated on CD19-specific CAR positive populations. The expression of mbII,-15 is continuously maintained after re-introduction of ligand. Constructs 1, 4, 5, 6 and 9 correspond to constructs as schematically depicted in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>.</li><li><figref idref="f0014"><b>FIG. 11</b></figref> shows quantitative RT-qPCR analysis of mbII,-15 expression in cells transfected with ligand-inducible gene switch vector systems described herein, on days 29, 33, 35, and 40 of post nucleofection in the presence and absence of a ligand described herein, demonstrating the ligand dependent regulation of expression of mbIL-15 by the gene switch.</li><li><figref idref="f0015"><b>FIG. 12</b></figref> shows results from a cell survival assay illustrating ligand regulated mb IL-15 expression promotes preferential CAR-T cell survival in the absence of IL-2 and IL-21 cytokines.</li><li><figref idref="f0016"><b>FIG. 13A</b></figref><b>,</b><figref idref="f0017"><b>13B</b></figref><b>,</b><figref idref="f0018"><b>13C</b></figref><b>and</b><figref idref="f0019"><b>13D</b></figref> show the quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, demonstrating veledimex ligand dose response. <figref idref="f0019"><b>FIG. 13D</b></figref> shows quantitative flow cytometric analyses of cells transfected with ligand-inducible gene switch vector systems described herein, demonstrating veledimex ligand dose response. The cells were gated on FSC/SSC/LIVE/CD3+. Samples were taken following a 2 day incubation with veledimex at 100nM, 25nM, 6.25nM, 1.56nM, 0.4nM and 0nM (DMSO control).</li><li><figref idref="f0020"><b>FIG. 14</b></figref> is a western blot analysis of mb-IL-15 expression in cells transfected with ligand-inducible gene switch vector systems described herein, in the presence/absence of veledimex ligand.</li><li><figref idref="f0021"><b>FIG. 15A</b></figref><b>and</b><figref idref="f0022"><b>FIG. 15B</b></figref> are schematic depictions of varying structural components of generic diverse ligand-inducible gene switch vector systems described herein. In the schematic, "PR" stands for a promoter; "IP" is a gene switch ligand-inducible promoter for gene transcription; "5'UTR" is a 5' untranslated region (for transcription into mRNA); "GOI", "GOI-1", "GOI-2" are Gene(s) Of Interest (or first (GOI-1) and second GOI (GOI-2) to be transcribed and expressed as mRNA only (e.g., siRNA) or as mRNA and polypeptide; "Linker" is a cleavable or ribosome skipping linker sequence; "TAD" is a transcription transactivation domain (for instance, but not limited to a VP16 TAD from Herpes Virus); "LBD" is a nuclear receptor ligand binding domain (for instance, but not limited to a USP domain, an RXR domain, or chimeras (<i>e.g</i>., USP/RXR chimeras) and substitution mutated LBD domains derived from vertebrate and invertebrate species); "DBD" is a DNA binding domain (for instance, but not limited to a Gal4 DBD); "EcR" is an Ecdysone Receptor ligand binding domain, including truncated and substitution mutated EcR domains (such as EcR domains which confer <i>in vitro</i> and <i>in vivo</i> ability to form an active transcriptional activation complex in the presence of steroidal and/or non-steroidal ligands (agonists); including steroidal ligands (such as ponasterone A and muristerone A) and non-steroidal ligands (such as diacylhydrazines, tebufenozide and methoxyfenozide); "Optional GOI" is any optional gene of interest to be transcribed and expressed as mRNA or polypeptide; and "BD polyA" is a Bi-directional Poly-Adenosine tail sequence.</li><li><figref idref="f0023"><b>FIG. 16A</b></figref><b>and</b><figref idref="f0024"><b>FIG. 16B</b></figref> are schematic depictions of varying structural components of diverse ligand-inducible gene switch vector systems described herein.</li><li><figref idref="f0025"><b>FIG. 17</b></figref> is a schematic description of an exemplary ligand-inducible gene switch vector system with recombinase attachment sites. Such systems can utilize recombinases (such as serine recombinases) to integrate a single vector into an immune cell (<i>e.g.</i> T cell).</li><li><figref idref="f0026"><b>FIG. 18A</b></figref> is a table depicting % CAR positive T cells over Days 1, 8 and 15. Such T cells were modified to express CAR and gene switch controlled mbIL-15 (RTS-mbIL15) from a single vector using serine recombinase (SF370)-mediated integration. <figref idref="f0027"><b>FIG. 18B</b></figref> depicts the induction of mbIl-15 expression in the presence and absence of veledimex at day 15. The figure also demonstrates the loss of mbIL15 expression upon removal of veledimex at day 22. <figref idref="f0028"><b>FIG. 18C</b></figref> is an exemplary depiction of RTS-mbIL15- constitutive CAR construct.</li><li><figref idref="f0029 f0030">FIG. 19A-B</figref> schematically illustrate various structural components of diverse ligand-inducible gene switch vector systems under the control of constitutive or T cell specific promoters.</li><li><figref idref="f0031"><b>FIG. 20A</b></figref> schematically illustrates various structural components of diverse ligand-inducible gene switch vector systems under the control of constitutive or T cell specific promoters. <figref idref="f0032 f0033 f0034 f0035"><b>FIG. 20B-20E</b></figref> show the quantitative flow cytometric analysis of cells transfected with ligand-inducible gene switch vector systems described herein, demonstrating that expression of mbII,-15 is dependent on T cell activation (with addition of ConA) and presence of veledimex. Constructs 1-6 correspond to constructs as schematically depicted in <figref idref="f0031">FIG. 20A</figref>.</li><li><figref idref="f0036 f0037"><b>FIG. 21A-21B</b></figref> depicts various configurations of IL-12.</li><li><figref idref="f0038"><b>FIG. 22</b></figref> schematically illustrates various structural components of diverse ligand-inducible gene switch vector systems under the control of constitutive or inducible promoters.</li><li><figref idref="f0039"><b>FIG. 23</b></figref> schematically illustrates various structural components of diverse ligand-inducible gene switch vector systems to express different forms of IL-12 under the control of constitutive, inducible promoters or tissue-specific promoters (PR). IL-12 can be expressed as a single chain IL-12; membrane bound IL-12 or by individual expression of p35 and p40 domains.</li><li><figref idref="f0040 f0041 f0042 f0043"><b>FIG. 24A-24D</b></figref> schematically illustrate various structural components of diverse ligand-inducible gene switch vector systems under the control of constitutive or inducible promoters.</li><li><figref idref="f0044 f0045"><b>FIG. 25A-25B</b></figref> schematically illustrate various structural components of diverse ligand-inducible gene switch vector systems under the control of constitutive, inducible or T-cell specific promoters.</li><li><figref idref="f0046"><b>FIG. 26</b></figref> show the quantitative flow cytometric analysis depicting expression of CAR in EGFRvIII CAR T cells expanded <i>ex vivo</i> by successive stimulations via co-culture with AaPC using multiple donors.</li><li><figref idref="f0047"><b>FIG. 27</b></figref> shows production of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein in presence/absence of veledimex ligand (solvent: DMSO).</li><li><figref idref="f0048 f0049"><b>FIG. 28</b></figref> show analyses of IL-12 expression levels. <figref idref="f0048"><b>FIG. 28A</b></figref> shows expression levels of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein in presence/absence of veledimex ligand (solvent: DMSO) in the absence of cell activation. <figref idref="f0049"><b>FIG. 28B</b></figref> shows expression levels of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein in presence/absence of veledimex ligand (solvent: DMSO) following antigen specific activation.</li><li><figref idref="f0050"><b>FIG. 29</b></figref> show analyses of IL-12 expression levels in cells transfected with ligand-inducible gene switch vector system described herein and co-cultured in presence/absence of aAPCs and veledimex ligand (solvent: DMSO).</li><li><figref idref="f0051"><b>FIG. 30A</b></figref><b>and</b><figref idref="f0052"><b>30B</b></figref> show time course analyses of IL-12 expression levels. <figref idref="f0051 f0052"><b>FIG. 30</b></figref><b>A</b> shows expression levels of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein and co-cultured in absence of AaPC s in presence/absence of veledimex ligand (solvent: DMSO). Ligand was added at 24 hours and withdrawn at 48 hours. <figref idref="f0052"><b>FIG. 30B</b></figref> shows expression levels of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein and co-cultured in presence of AaPC s in presence/absence of veledimex ligand (solvent: DMSO). Ligand was added at 24 hours and withdrawn at 48 hours. Expression of of IL-12 was quantified at 24, 48 and 120 hours post addition of ligand.</li><li><figref idref="f0053"><b>FIG. 31A</b></figref><b>and</b><figref idref="f0054"><b>31B</b></figref> show analyses of IL-12 expression levels. <figref idref="f0053"><b>FIG. 31A</b></figref> shows expression levels of IL-12 in presence/absence of veledimex and AaPCs by cells transfected with ligand-inducible gene switch vector system described herein and expanded by co-culture with AaPCs in media without veledimex previously(cycle 1). <figref idref="f0054"><b>FIG. 31B</b></figref> shows production of IL-12 in presence/absence of veledimex and AaPCs by cells transfected with ligand-inducible gene switch vector system described herein and expanded by co-culture with AaPCs in media previously (cycle 1).</li><li><figref idref="f0055"><b>FIG. 32A and 32B</b></figref> show analyses of IL-12 expression levels. <figref idref="f0055"><b>FIG. 32A</b></figref> shows production of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein. Veledimex ligand was added at time 0, withdrawn at time 48 hours, added again at time 168 hours and withdrawn at time 216 hours. <figref idref="f0055"><b>FIG. 32B</b></figref> shows expression of CAR in cells transfected with ligand-inducible gene switch vector systems described herein by flow cytometry analysis. Cells are gated on CD3 positive population.</li><li><figref idref="f0056"><b>FIG. 33</b></figref> shows expression levels of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein in presence of veledimex and in presence (cycle 1) / absence (cycle 2) of AaPCs.</li><li><figref idref="f0057"><b>FIG. 34</b></figref> shows veledimex dose dependent expression of IL-12 by cells transfected with ligand-inducible gene switch vector system described herein.</li><li><figref idref="f0058"><b>FIG. 35</b></figref> shows production of IFNγ by CAR-T cells generated via transfection of ligand-inducible gene switch vector system described herein and co-cultured with target cells at 1:1 effector to target cell ratio. Production of IFNγ was measured using co-culture of CAR-T cells with EL4, EL4 EGFRvIII target cells as well as no target cell (effector alone) control.</li><li><figref idref="f0059"><b>FIG. 36A</b></figref><b>and</b><figref idref="f0060"><b>36B</b></figref> show specific cytotoxicity of CAR-T cells. <figref idref="f0059"><b>FIG. 36A</b></figref> shows production of IFNγ by CAR-T cells generated via transfection of ligand-inducible gene switch vector system described herein. Effector CAR-T cells were co-cultured with U87MG, U87MG-FLuc-GFP, U87MG-EGFRvIII-FLuc-GFP, U251MG, U251MG-FLuc-GFP and U251MG-EGFRvIII-FLuc-GFP target cells at 1:1 effector:target cell ratio for 24 hours before analysis of IFNγ expression in culture supernatants. <figref idref="f0060"><b>FIG. 36B</b></figref> shows % lysis of EGFRvIII expressing glioblastoma cells by CAR-T cells generated via transfection of ligand-inducible gene switch vector system described herein. Effector CAR-T cells were co-incubated with EL4, EL4 expressing EGFRvIII, K562 and K562 expressing EGFRvIII target cell lines at varying effector:target cell ratios.</li></ul>

DETAILED DESCRIPTION OF THE DISCLOSURE

0073The following description and examples illustrate embodiments of the present disclosure in detail. It is to be understood that this disclosure is not limited to the particular embodiments described herein and as such can vary. Those of skill in the art will recognize that there are numerous variations and modifications of this disclosure, which are encompassed within its scope.

0074All terms are intended to be understood as they would be understood by a person skilled in the art. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure pertains.

0075The section headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.

0076Although various features of the present disclosure may be described in the context of a single embodiment, the features may also be provided separately or in any suitable combination. Conversely, although the present disclosure may be described herein in the context of separate embodiments for clarity, the present disclosure may also be implemented in a single embodiment.

Definitions

0077The following definitions supplement those in the art and are directed to the current application and are not to be imputed to any related or unrelated case, e.g., to any commonly owned patent or application. Although any methods and materials similar or equivalent to those described herein can be used in the practice for testing of the present disclosure, the preferred materials and methods are described herein. Accordingly, the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

0078In this application, the use of the singular includes the plural unless specifically stated otherwise. It must be noted that, as used in the specification, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. In this application, the use of "or" means "and/or" unless stated otherwise. Furthermore, use of the term "including" as well as other forms, such as "include", "includes," and "included," is not limiting.

0079Reference in the specification to "some embodiments," "an embodiment," "one embodiment" or "other embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments, of the present disclosure.

0080As used in this specification and claim(s), the words "comprising" (and any form of comprising, such as "comprise" and "comprises"), "having" (and any form of having, such as "have" and "has"), "including" (and any form of including, such as "includes" and "include") or "containing" (and any form of containing, such as "contains" and "contain") are inclusive or open-ended and do not exclude additional, unrecited elements or method steps. It is contemplated that any embodiment discussed in this specification can be implemented with respect to any method or composition of the present disclosure, and vice versa. Furthermore, compositions of the present disclosure can be used to achieve methods of the present disclosure.

0081The term "about" or "approximately" means within an acceptable error range for the particular value as determined by one of ordinary skill in the art, which will depend in part on how the value is measured or determined, i.e., the limitations of the measurement system. For example, "about" can mean within 1 or more than 1 standard deviation, per the practice in the art. Alternatively, "about" can mean a range of up to 20%, up to 10%, up to 5%, or up to 1% of a given value. In another example, the amount "about 10" includes 10 and any amounts from 9 to 11. In yet another example, the term "about" in relation to a reference numerical value can also include a range of values plus or minus 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1% from that value. Alternatively, particularly with respect to biological systems or processes, the term "about" can mean within an order of magnitude, preferably within 5-fold, and more preferably within 2-fold, of a value. Where particular values are described in the application and claims, unless otherwise stated the term "about" meaning within an acceptable error range for the particular value should be assumed.

0082The term "isolated" and its grammatical equivalents as used herein refer to the removal of a nucleic acid from its natural environment. The term "purified" and its grammatical equivalents as used herein refer to a molecule or composition, whether removed from nature (including genomic DNA and mRNA) or synthesized (including cDNA) and/or amplified under laboratory conditions, that has been increased in purity, wherein "purity" is a relative term, not "absolute purity." It is to be understood, however, that nucleic acids and proteins may be formulated with diluents or adjuvants and still for practical purposes be isolated. For example, nucleic acids typically are mixed with an acceptable carrier or diluent when used for introduction into cells. The term "substantially purified" and its grammatical equivalents as used herein refer to a nucleic acid sequence, polypeptide, protein or other compound which is essentially free, <i>i.e.,</i> is more than about 50% free of, more than about 70% free of, more than about 90% free of, the polynucleotides, proteins, polypeptides and other molecules that the nucleic acid, polypeptide, protein or other compound is naturally associated with.

0083"Polynucleotide" or "oligonucleotide" as used herein refers to a polymeric form of nucleotides or nucleic acids of any length, either ribonucleotides or deoxyribonucleotides. This term refers only to the primary structure of the molecule. Thus, this term includes double and single stranded DNA, triplex DNA, as well as double and single stranded RNA. It also includes modified, for example, by methylation and/or by capping, and unmodified forms of the polynucleotide. The term is also meant to include molecules that include non-naturally occurring or synthetic nucleotides as well as nucleotide analogs.

0084"Polypeptide", "peptide", "protein" and their grammatical equivalents as used herein refers to a polymer of amino acid residues. A "mature protein" is a protein which is full-length and which, optionally, includes glycosylation or other modifications typical for the protein in a given cellular environment. Polypeptides and proteins disclosed herein (including functional portions and functional variants thereof) can comprise synthetic amino acids in place of one or more naturally-occurring amino acids. Such synthetic amino acids are known in the art, and include, for example, aminocyclohexane carboxylic acid, norleucine, α-amino n-decanoic acid, homoserine, S-acetylaminomethyl-cysteine, trans-3- and trans-4-hydroxyproline, 4-aminophenylalanine, 4-nitrophenylalanine, 4-chlorophenylalanine, 4-carboxyphenylalanine, β-phenyl serine β-hydroxyphenylalanine, phenylglycine, α-naphthylalanine, cyclohexylalanine, cyclohexylglycine, indoline-2-carboxylic acid, 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, aminomalonic acid, aminomalonic acid monoamide, N'-benzyl-N'-methyl-lysine, N',N'-dibenzyl-lysine, 6-hydroxylysine, ornithine, α-aminocyclopentane carboxylic acid, α-aminocyclohexane carboxylic acid, α-aminocycloheptane carboxylic acid, α-(2-amino-2-norbornane)-carboxylic acid, α,γ-diaminobutyric acid, α,β-diaminopropionic acid, homophenylalanine, and α-tert-butylglycine. The present disclosure further contemplates that expression of polypeptides described herein in an engineered cell can be associated with post-translational modifications of one or more amino acids of the polypeptide constructs. Non-limiting examples of post-translational modifications include phosphorylation, acylation including acetylation and formylation, glycosylation (including N-linked and O-linked), amidation, hydroxylation, alkylation including methylation and ethylation, ubiquitylation, addition of pyrrolidone carboxylic acid, formation of disulfide bridges, sulfation, myristoylation, palmitoylation, isoprenylation, farnesylation, geranylation, glypiation, lipoylation and iodination.

0085Nucleic acids and/or nucleic acid sequences are "homologous" when they are derived, naturally or artificially, from a common ancestral nucleic acid or nucleic acid sequence. Proteins and/or protein sequences are homologous when their encoding DNAs are derived, naturally or artificially, from a common ancestral nucleic acid or nucleic acid sequence. The homologous molecules can be termed homologs. For example, any naturally occurring proteins, as described herein, can be modified by any available mutagenesis method. When expressed, this mutagenized nucleic acid encodes a polypeptide that is homologous to the protein encoded by the original nucleic acid. Homology is generally inferred from sequence identity between two or more nucleic acids or proteins (or sequences thereof). The precise percentage of identity between sequences that is useful in establishing homology varies with the nucleic acid and protein at issue, but as little as 25% sequence identity is routinely used to establish homology. Higher levels of sequence identity, <i>e.g.,</i> 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% or 99% or more can also be used to establish homology. Methods for determining sequence identity percentages (<i>e.g</i>., BLASTP and BLASTN using default parameters) are described herein and are generally available.

0086The terms "identical" and its grammatical equivalents as used herein or "sequence identity" in the context of two nucleic acid sequences or amino acid sequences of polypeptides refers to the residues in the two sequences which are the same when aligned for maximum correspondence over a specified comparison window. A "comparison window", as used herein, refers to a segment of at least about 20 contiguous positions, usually about 50 to about 200, more usually about 100 to about 150 in which a sequence may be compared to a reference sequence of the same number of contiguous positions after the two sequences are aligned optimally. Methods of alignment of sequences for comparison are well-known in the art. Optimal alignment of sequences for comparison may be conducted by the local homology algorithm of <nplcit id="ncit0001" npl-type="s"><text>Smith and Waterman, Adv. Appl. Math., 2:482 (1981</text></nplcit>); by the alignment algorithm of <nplcit id="ncit0002" npl-type="s"><text>Needleman and Wunsch, J. Mol. Biol., 48:443 (1970</text></nplcit>); by the search for similarity method of <nplcit id="ncit0003" npl-type="s"><text>Pearson and Lipman, Proc. Nat. Acad. Sci U.S.A., 85:2444 (1988</text></nplcit>); by computerized implementations of these algorithms (including, but not limited to CLUSTAL in the PC/Gene program by Intelligentics, Mountain View Calif., GAP, BESTFIT, BLAST, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group (GCG), 575 Science Dr., Madison, Wis., U.S.A.); the CLUSTAL program is well described by <nplcit id="ncit0004" npl-type="s"><text>Higgins and Sharp, Gene, 73:237-244 (1988</text></nplcit>) and <nplcit id="ncit0005" npl-type="s"><text>Higgins and Sharp, CABIOS, 5:151-153 (1989</text></nplcit>); <nplcit id="ncit0006" npl-type="s"><text>Corpet et al., Nucleic Acids Res., 16:10881-10890 (1988</text></nplcit>); <nplcit id="ncit0007" npl-type="s"><text>Huang et al., Computer Applications in the Biosciences, 8:155-165 (1992</text></nplcit>); and <nplcit id="ncit0008" npl-type="s"><text>Pearson et al., Methods in Molecular Biology, 24:307-331 (1994</text></nplcit>). Alignment is also often performed by inspection and manual alignment. In one class of embodiments, the polypeptides herein are at least 80%, 85%, 90%, 98% 99% or 100% identical to a reference polypeptide, or a fragment thereof, <i>e.g.,</i> as measured by BLASTP (or CLUSTAL, or any other available alignment software) using default parameters. Similarly, nucleic acids can also be described with reference to a starting nucleic acid, <i>e.g.,</i> they can be 50%, 60%, 70%, 75%, 80%, 85%, 90%, 98%, 99% or 100% identical to a reference nucleic acid or a fragment thereof, <i>e.g.,</i> as measured by BLASTN (or CLUSTAL, or any other available alignment software) using default parameters. When one molecule is said to have certain percentage of sequence identity with a larger molecule, it means that when the two molecules are optimally aligned, said percentage of residues in the smaller molecule finds a match residue in the larger molecule in accordance with the order by which the two molecules are optimally aligned.

0087The term "substantially identical" and its grammatical equivalents as applied to nucleic acid or amino acid sequences mean that a nucleic acid or amino acid sequence comprises a sequence that has at least 90% sequence identity or more, at least 95%, at least 98% and at least 99%, compared to a reference sequence using the programs described above, <i>e.g</i>., BLAST, using standard parameters. For example, the BLASTN program (for nucleotide sequences) uses as defaults a word length (W) of 11, an expectation (E) of 10, M=5, N=-4, and a comparison of both strands. For amino acid sequences, the BLASTP program uses as defaults a word length (W) of 3, an expectation (E) of 10, and the BLOSUM62 scoring matrix (see <nplcit id="ncit0009" npl-type="s"><text>Henikoff &amp; Henikoff, Proc. Natl. Acad. Sci. USA 89:10915 (1992</text></nplcit>)). Percentage of sequence identity is determined by comparing two optimally aligned sequences over a comparison window, wherein the portion of the polynucleotide sequence in the comparison window may comprise additions or deletions (<i>i.e</i>., gaps) as compared to the reference sequence (which does not comprise additions or deletions) for optimal alignment of the two sequences. The percentage is calculated by determining the number of positions at which the identical nucleic acid base or amino acid residue occurs in both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the window of comparison and multiplying the result by 100 to yield the percentage of sequence identity. In embodiments, the substantial identity exists over a region of the sequences that is at least about 50 residues in length, over a region of at least about 100 residues, and in embodiments, the sequences are substantially identical over at least about 150 residues. In embodiments, the sequences are substantially identical over the entire length of the coding regions.

0088"Transposon" or "transposable element" (TE) is a vector DNA sequence that can change its position within the genome, sometimes creating or reversing mutations and altering the cell's genome size. Transposition often results in duplication of the TE. Class I TEs are copied in two stages: first, they are transcribed from DNA to RNA, and the RNA produced is then reverse transcribed to DNA. This copied DNA is then inserted at a new position into the genome. The reverse transcription step is catalyzed by a reverse transcriptase, which may be encoded by the TE itself. The characteristics of retrotransposons are similar to retroviruses, such as HIV. The cut-and-paste transposition mechanism of class II TEs does not involve an RNA intermediate. The transpositions are catalyzed by several transposase enzymes. Some transposases non-specifically bind to any target site in DNA, whereas others bind to specific DNA sequence targets. The transposase makes a staggered cut at the target site resulting in single-strand 5' or 3' DNA overhangs (sticky ends). This step cuts out the DNA transposon, which is then ligated into a new target site; this process involves activity of a DNA polymerase that fills in gaps and of a DNA ligase that closes the sugar-phosphate backbone. This results in duplication of the target site. The insertion sites of DNA transposons may be identified by short direct repeats which may be created by the staggered cut in the target DNA and filling in by DNA polymerase, followed by a series of inverted repeats important for the TE excision by transposase. Cut-and-paste TEs may be duplicated if their transposition takes place during S phase of the cell cycle when a donor site has already been replicated, but a target site has not yet been replicated. Transposition can be classified as either "autonomous" or "non-autonomous" in both Class I and Class II TEs. Autonomous TEs can move by themselves while non-autonomous TEs require the presence of another TE to move. This is often because non-autonomous TEs lack transposase (for class II) or reverse transcriptase (for class I).

0089"Transposase" refers an enzyme that binds to the end of a transposon and catalyzes the movement of the transposon to another part of the genome by a cut and paste mechanism or a replicative transposition mechanism. In some embodiments, the transposase's catalytic activity can be utilized to move gene(s) from a vector to the genome. In some embodiments, the transposase's catalytic activity can be utilized to move gene(s) from a vector (<i>e.g.</i> a transposon) to the genome. In certain embodiments, the Sleeping Beauty transposase is provided as an mRNA. In some aspects, the mRNA comprises a cap and a poly-A tail.

0090The nucleic acid sequences and vectors disclosed or contemplated herein may be introduced into a cell by "transfection," "transformation," "nucleofection" or "transduction." "Transfection," "transformation," or "transduction," as used herein refers to the introduction of one or more exogenous polynucleotides into a host cell by using physical or chemical methods. Many transfection techniques are known in the art and include, for example, calcium phosphate DNA co-precipitation (see, <i>e.g</i>., <nplcit id="ncit0010" npl-type="b"><text>Murray E. J. (ed.), Methods in Molecular Biology, Vol. 7, Gene Transfer and Expression Protocols, Humana Press (1991</text></nplcit>)); DEAE-dextran; electroporation; cationic liposome-mediated transfection; tungsten particle-facilitated microparticle bombardment (<nplcit id="ncit0011" npl-type="s"><text>Johnston, Nature, 346: 776-777 (1990</text></nplcit>)); and strontium phosphate DNA co-precipitation (<nplcit id="ncit0012" npl-type="s"><text>Brash et al., Mol. Cell Biol., 7: 2031-2034 (1987</text></nplcit>)); and nucleofection (<nplcit id="ncit0013" npl-type="s"><text>Trompeter et al., J. Immunol. Methods 274:245-256 (2003</text></nplcit>). Phage or viral vectors can be introduced into host cells, after growth of infectious particles in suitable packaging cells, many of which are commercially available.

0091"Tumor antigen" as used herein refers to any antigenic substance produced or overexpressed in tumor cells. It may, for example, trigger an immune response in the host. Alternatively, for purposes of this disclosure, tumor antigens may be proteins that are expressed by both healthy and tumor cells but because they identify a certain tumor type, are a suitable therapeutic target. In embodiments, the tumor antigen is CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2. In one embodiment, the tumor antigen is EGFRvIII, which is a target for CAR T cell therapies for treating myeloid malignancies, for example, glioblastoma or glioblastoma multiforme (GBM). In another embodiment, the tumor antigen is CD19. In yet another embodiment, the tumor antigen is CD33.

0092The term "enhancer," as used herein, refers to a DNA sequence that increases transcription of, for example, a nucleic acid sequence to which it is operably linked. Enhancers can be located many kilobases away from the coding region of the nucleic acid sequence and can mediate the binding of regulatory factors, patterns of DNA methylation, or changes in DNA structure. A large number of enhancers from a variety of different sources are well known in the art and are available as or within cloned polynucleotides (from, <i>e.g</i>., depositories such as the ATCC as well as other commercial or individual sources). A number of polynucleotides comprising promoters (such as the commonly-used CMV promoter) also comprise enhancer sequences. Enhancers can be located upstream, within, or downstream of coding sequences. The term "Ig enhancers" refers to enhancer elements derived from enhancer regions mapped within the immunoglobulin (Ig) locus (such enhancers include for example, the heavy chain (mu) 5' enhancers, light chain (kappa) 5' enhancers, kappa and mu intronic enhancers, and 3' enhancers (see generally <nplcit id="ncit0014" npl-type="b"><text>Paul W. E. (ed), Fundamental Immunology, 3rd Edition, Raven Press, New York (1993), pages 353-363</text></nplcit>; and <patcit id="pcit0003" dnum="US5885827A"><text>U.S. Pat. No. 5,885,827</text></patcit>).

0093"Coding sequence" as used herein refers to a segment of a polynucleotide that codes for a polypeptide. The region or sequence is bounded nearer the 5' end by a start codon and nearer the 3' end with a stop codon. Coding sequences may also be referred to as open reading frames.

0094"Operably linked" as used herein refers to refers to the physical and/or functional linkage of a DNA segment to another DNA segment in such a way as to allow the segments to function in their intended manners. A DNA sequence encoding a gene product is operably linked to a regulatory sequence when it is linked to the regulatory sequence, such as, for example, promoters, enhancers and/or silencers, in a manner which allows modulation of transcription of the DNA sequence, directly or indirectly. For example, a DNA sequence is operably linked to a promoter when it is ligated to the promoter downstream with respect to the transcription initiation site of the promoter, in the correct reading frame with respect to the transcription initiation site and allows transcription elongation to proceed through the DNA sequence. An enhancer or silencer is operably linked to a DNA sequence coding for a gene product when it is ligated to the DNA sequence in such a manner as to increase or decrease, respectively, the transcription of the DNA sequence. Enhancers and silencers may be located upstream, downstream or embedded within the coding regions of the DNA sequence. A DNA for a signal sequence is operably linked to DNA coding for a polypeptide if the signal sequence is expressed as a preprotein that participates in the secretion of the polypeptide. Linkage of DNA sequences to regulatory sequences is typically accomplished by ligation at suitable restriction sites or via adapters or linkers inserted in the sequence using restriction endonucleases known to one of skill in the art.

0095The term "transcriptional regulator" refers to a biochemical element that acts to prevent or inhibit the transcription of a promoter-driven DNA sequence under certain environmental conditions (<i>e.g</i>., a repressor or nuclear inhibitory protein), or to permit or stimulate the transcription of the promoter-driven DNA sequence under certain environmental conditions (<i>e.g</i>., an inducer or an enhancer).

0096The term "induce", "induction" and its grammatical equivalents as used herein refer to an increase in nucleic acid sequence transcription, promoter activity and/or expression brought about by a transcriptional regulator, relative to some basal level of transcription.

0097A "target" gene or "heterologous" gene, or "gene of interest (GOI)" refers to a gene introduced into the host cell by gene transfer. Exemplary GOI can be an antigen binding polypeptide that can include an antigen binding polypeptide, chimeric receptor, CAR,TCR, a cytokine and/or a cell tag as described herein.

0098"Recombinase" as used herein refers to a group of enzymes that can facilitate site-specific recombination between defined sites, where the sites are physically separated on a single DNA molecule or where the sites reside on separate DNA molecules. The DNA sequences of the defined recombination sites are not necessarily identical. Initiation of recombination depends on protein-DNA interaction, within the group there are large number of proteins that catalyze phage integration and excision (<i>e.g</i>., λ integrase, .φC31), resolution of circular plasmids (<i>e.g</i>., Tn3, gamma delta, Cre, Flp), DNA inversion for expression of alternate genes (<i>e.g</i>., Hin, Gin, Pin), assembly of genes during development (<i>e.g</i>., Anabaena nitrogen fixation genes), and transposition (<i>e.g</i>., IS607 transposon). Most site-specific recombinases fall into one of the two families, based on evolutionary and mechanistic relatedness. These are . λ integrase family or tyrosine recombinases (<i>e.g</i>., Cre, Flp, Xer D) and resolvase/integrase family or serine recombinase family (<i>e.g</i>., φC31, TP901-1, Tn3, gamma delta).

0099"Recombination attachment sites" are specific polynucleotide sequences that are recognized by the recombinase enzymes described herein. Typically, two different sites are involved (termed "complementary sites"), one present in the target nucleic acid (<i>e.g</i>., a chromosome or episome of a eukaryote or prokaryote) and another on the nucleic acid that is to be integrated at the target recombination site. The terms "attB" and "attP," which refer to attachment (or recombination) sites originally from a bacterial target and a phage donor, respectively, are used herein although recombination sites for particular enzymes may have different names. The recombination sites typically include left and right arms separated by a core or spacer region. Thus, an attB recombination site consists of BOB', where B and B' are the left and right arms, respectively, and O is the core region. Similarly, attP is POP', where P and P' are the arms and O is again the core region. Upon recombination between the attB and attP sites, and concomitant integration of a nucleic acid at the target, the recombination sites that flank the integrated DNA are referred to as "attL" and "attR." The attL and attR sites, using the terminology above, thus consist of BOP' and POB', respectively. In some representations herein, the "O" is omitted and attB and attP, for example, are designated as BB' and PP', respectively.

Modulation of the Expression of Genes

0100In the field of genetic engineering, precise control of gene expression is a valuable tool for studying, manipulating, and controlling development and other physiological processes. Gene expression is a complex biological process involving a number of specific protein-protein interactions. Tightly regulated inducible gene expression systems or "gene switches" are useful for various applications such as gene therapy, large scale production of proteins in cells, cell based high throughput screening assays, functional genomics and regulation of traits in transgenic plants and animals. However, for therapy, regulated and localized expression is important to prevent off-target effects. Provided herein are means to regulate the expression of heterologous genes such as cytokines when required and at a specific vicinity of a target cell or location. Further provided herein is a method to regulate the expression of heterologous genes such as cytokines wherein the cytokine, for example, is under the control of a ligand inducible promoter. In some instances, the method results in a low or no basal level of heterologous gene expression in the absence of the ligand. In a further embodiment, the ligand inducible promoter is a gene switch ligand inducible promoter. Further provided herein are methods to regulate the expression of heterologous genes such as cytokines from an engineered cell. Herein an engineered cell is a cell which has been modified from its natural or endogenous state. An example of an engineered cell is a cell described herein which has been modified (<i>e.g</i>., by transfection of a polynucleotide into the cell). In some instances, the engineered cell can be an engineered immune effector cell. In one instance, the engineered cell is a T cell. In another instance, the engineered cell is a NK cell. In one instance, engineered cells are activated prior to inducing the expression of the heterologous gene with a ligand. In another instance, the engineered cells are activated by exposing the cells to an antigen. The antigen can be an antigen that is recognized by the antigen binding polypeptide expressed by the engineered cell. The antigen can be a tumor antigen or an infectious disease antigen. In one instance, the engineered cell can comprise an antigen binding polypeptide that binds such an antigen.

0101In a further instance, the gene switch components of a gene switch ligand inducible promoter can be further regulated by a tissue specific promoter. In such cases, the gene switch components are only expressed when the tissue specific promoter is activated, for example, in an activated T cell or an activated NK cell..

Vector

0102An "expression vector" or "vector" is any genetic element, <i>e.g</i>., a plasmid, chromosome, virus, transposon, behaving either as an autonomous unit of polynucleotide replication within a cell. (<i>i.e.</i> capable of replication under its own control) or being rendered capable of replication by insertion into a host cell chromosome, having attached to it another polynucleotide segment, so as to bring about the replication and/or expression of the attached segment. Suitable vectors include, but are not limited to, plasmids, transposons, bacteriophages and cosmids. Vectors may contain polynucleotide sequences which are necessary to effect ligation or insertion of the vector into a desired host cell and to effect the expression of the attached segment. Such sequences differ depending on the host organism; they include promoter sequences to effect transcription, enhancer sequences to increase transcription, ribosomal binding site sequences and transcription and translation termination sequences. Alternatively, expression vectors may be capable of directly expressing nucleic acid sequence products encoded therein without ligation or integration of the vector into host cell DNA sequences.

0103Vector also can comprise a "selectable marker gene." The term "selectable marker gene," as used herein, refers to a nucleic acid sequence that allows cells expressing the nucleic acid sequence to be specifically selected for or against, in the presence of a corresponding selective agent. Suitable selectable marker genes are known in the art and described in, <i>e.g.</i>, International Patent Application Publications <patcit id="pcit0004" dnum="WO199208796A"><text>WO 1992/08796</text></patcit> and <patcit id="pcit0005" dnum="WO199428143A"><text>WO 1994/28143</text></patcit>; <nplcit id="ncit0015" npl-type="s"><text>Wigler et al., Proc. Natl. Acad. Sci. USA, 77: 3567 (1980</text></nplcit>); <nplcit id="ncit0016" npl-type="s"><text>O'Hare et al., Proc. Natl. Acad. Sci. USA, 78: 1527 (1981</text></nplcit>); <nplcit id="ncit0017" npl-type="s"><text>Mulligan &amp; Berg, Proc. Natl. Acad. Sci. USA, 78: 2072 (1981</text></nplcit>); <nplcit id="ncit0018" npl-type="s"><text>Colberre-Garapin et al., J. Mol. Biol., 150:1 (1981</text></nplcit>); <nplcit id="ncit0019" npl-type="s"><text>Santerre et al., Gene, 30: 147 (1984</text></nplcit>); <nplcit id="ncit0020" npl-type="s"><text>Kent et al., Science, 237: 901-903 (1987</text></nplcit>); <nplcit id="ncit0021" npl-type="s"><text>Wigler et al., Cell, 11: 223 (1977</text></nplcit>); <nplcit id="ncit0022" npl-type="s"><text>Szybalska &amp; Szybalski, Proc. Natl. Acad. Sci. USA, 48: 2026 (1962</text></nplcit>); <nplcit id="ncit0023" npl-type="s"><text>Lowy et al., Cell, 22: 817 (1980</text></nplcit>); and <patcit id="pcit0006" dnum="US5122464A"><text>U.S. Pat. Nos. 5,122,464</text></patcit> and <patcit id="pcit0007" dnum="US5770359A"><text>5,770,359</text></patcit>.

0104In some embodiments, the vector is an "episomal expression vector" or "episome," which is able to replicate in a host cell, and persists as an extrachromosomal segment of DNA within the host cell in the presence of appropriate selective pressure (see, <i>e.g.,</i><nplcit id="ncit0024" npl-type="s"><text>Conese et al., Gene Therapy, 11:1735-1742 (2004</text></nplcit>)). Representative commercially available episomal expression vectors include, but are not limited to, episomal plasmids that utilize Epstein Barr Nuclear Antigen 1 (EBNA1) and the Epstein Barr Virus (EBV) origin of replication (oriP). The vectors pREP4, pCEP4, pREP7, and pcDNA3.1 from Invitrogen (Carlsbad, Calif.) and pBK-CMV from Stratagene (La Jolla, Calif.) represent non-limiting examples of an episomal vector that uses T-antigen and the SV40 origin of replication in lieu of EBNA1 and oriP.

0105As used herein, "a gene expression cassette" is part of a vector and can contain constitutive promoters such as EF1a or inducible promoters, 5' UTR, 3' UTR and polyA elements and one or more genes of interest (GOI). In one embodiment, the polyA element is SV40e polyA (SEQ ID NO 65). In another embodiment, the polyA element is bidirectional aCA polyA (SEQ ID NO 66). In yet another embodiment, the polyA is PA2 polyA (SEQ ID NO 67). In some aspects, a gene expression cassette may further comprise gene switch components such as a DNA-binding domain fused to a nuclear receptor ligand binding domain and/or a transactivation domain fused to a nuclear receptor ligand binding domain. A vector can include one or more gene expression cassette(s).

Vector Modifications

0106A polynucleotide vector useful for the methods and compositions described herein can be a good manufacturing practices (GMP) compatible vector. For example, a GMP vector may be purer than a non-GMP vector. In some cases, purity can be measured by bioburden. For example, bioburden can be the presence or absence of aerobes, anaerobes, sporeformers, fungi, or combinations thereof in a vector composition. In some cases, a pure vector can be endotoxin low or endotoxin free. Purity can also be measured by double-stranded primer-walking sequencing. Plasmid identity can be a source of determining purity of a vector. A GMP vector of the present disclosure can be from 10% to 99% more pure than a non-GMP vector. A GMP vector can be from 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% more pure than a non-GMP vector as measured by the presence of bioburden, endotoxin, sequencing, or combinations thereof.

0107In some cases, a terminator sequence at the end of the first gene program is used. A terminator sequence can ensure that a transcript is terminating prior to initiating a second gene program. For example, an expression vectors may contain sequences necessary for the termination of transcription and for stabilizing an mRNA. Such sequences are commonly available from the 5' and, occasionally 3', untranslated regions of eukaryotic or viral DNAs or cDNAs. These regions can contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA. Cells comprising the expression vector are grown under conditions that provide for expression of the desired polypeptide, either <i>in vivo</i> or <i>in vitro.</i>

0108In some cases, a spacer sequence can be used at the end of a first polypeptide encoded by a polynucleotide in a vector. In other cases, a spacer sequence can be used at the end of a second gene in a vector. A spacer sequence can also be used following a first gene and a second gene in a vector.

0109These vectors can be used to express a polypeptide encoded by a gene, or portion of a gene of interest. A gene of portion or a gene can be inserted by using any method, viral or non-viral. For example; a method can be a non-viral based technique.

IRES Elements

0110Also disclosed herein are constructs that comprise an IRES element to facilitate the expression and functionality of the polynucleotides and polypeptides described herein. The term "internal ribosome entry site (IRES)" as used herein can be intended to mean internal ribosomal entry site. In a vector comprising an IRES sequence, a first gene can be translated by a cap-dependent, ribosome scanning, mechanism with its own 5'-UTR, whereas translation of a subsequent gene can be accomplished by direct recruitment of a ribosome to an IRES in a cap-independent manner. An IRES sequence can allow eukaryotic ribosomes to bind and begin translation without binding to a 5' capped end. An IRES sequence can allow expression of multiple genes from one transcript (Mountford and Smith 1995).

0111The term "CAP" or "cap" as used herein refers to a modified nucleotide, generally a 7-methyl guanosine, linked 3' to 5' (7meG-ppp-G), to the 5' end of a eukaryotic mRNA, that serves as a required element in the normal translation initiation pathway during expression of protein from that mRNA.

0112In certain cases, an IRES region can be derived from a virus, such as picornavirus, encephalomyocarditis virus, hepatitis C virus IRES sequence. In other cases, an IRES sequence can be derived from an encephalomyocarditis virus. The term "EMCV" or "encephalomyocarditis virus" as used herein refers to any member isolate or strain of the encephalomyocarditis virus species of the genus of the family Picornaviridae. Examples are: EMCV-R (Rueckert) strain virus, Columbia-SK virus. In some cases, a cellular IRES element, such as eukaryotic initiation factor 4G, immunoglobulin heavy chain binding protein, c-myc proto-oncogene, vascular endothelial growth factor, fibroblast growth factor-1 IRES, or any combination or modification thereof can be used. In some cases, a cellular IRES can have increased gene expression when compared to a viral IRES.

0113An IRES sequence of viral, cellular or a combination thereof can be utilized in a vector. An IRES can be from encephalomyocarditis (EMCV) or poliovirus (PV). In some cases, an IRES element is selected from a group consisting of Poliovirus (PV), Encephalomyelitis virus (EMCV), Foot-and-mouth disease virus (FMDV), Porcine teschovirus-1 (PTV-1), Aichivirus (AiV), Seneca Valley virus (SVV), Hepatitis C virus (HCV), Classical swine fever virus (CSFV), Human immunodeficiency virus-2 (HIV-2), Human immunodeficiency virus-1 (HIV-1), Moloney murine leukemia virus (MoMLV), Feline immunodeficiency virus (FIV), Mouse mammary tumor virus (MMTV), Human cytomegalovirus latency (pUL138), Epstein-Barr virus (EBNA-1), Herpes virus Marek's disease (MDV RLORF9), SV40 polycistronic 19S (SV40 19S), Rhopalosiphum padi virus (RhPV), Cricket paralysis virus (CrPV), Ectropis obliqua picorna-like virus (EoPV), Plautia stali intestine virus (PSIV), Triatoma virus (TrV), Bee paralysis dicistrovirus (IAPV, KBV), Black currant reversion virus (BRV), Pelargonium flower break virus (PFBV), Hibiscus chlorotic ringspot virus (HCRSV), Crucifer-infecting tobamovirus (CrTMV), Potato leaf roll polerovirus (PLRV), Tobacco etch virus (TEV), Giardiavirus (GLV), Leishmania RNA virus-1 (LRV-1), and combinations or modifications thereof. In some cases, an IRES is selected from a group consisting of Apaf-1, XIAP, HIAP2/c-IAP1, DAP5, Bcl-2, c-myc, CAT-1, INR, Differentiation LEF-1, PDGF2, HIF-1a, VEGF, FGF2, BiP, BAG-1, CIRP, p53, SHMT1, PITSLREp58, CDK1, Rpr, hid, hsp70, grim, skl, Antennapedia, dFoxO, dInR, Adh-Adhr, HSP101, ADH, URE-2,GPR1, NCE102, YMR181a, MSN1, BOI1, FLO8, GIC1, and any combination or modification thereof. When an IRES element is included between two open reading frames (ORFs), initiation of translation can occur by a canonical 5'- m7GpppN cap-dependent mechanism in a first ORF and a cap-independent mechanism in a second ORF downstream of the IRES element.

0114In some cases, genes can be linked by an internal ribosomal entry site (IRES). An IRES can allow simultaneous expression of multiple genes. For example, an IRES sequence can permit production of multiple proteins from a single mRNA transcript. A ribosome can bind to an IRES in a 5'-cap independent manner and initiate translation.

0115In some cases, an IRES sequence can be or can be about 500 base pairs. An IRES sequence can be from 300 base pairs to 1000 base pairs. For example, an IRES can be 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, or 1000 base pairs long.

0116In some cases, expression of a downstream gene within a vector comprising an IRES sequence can be reduced. For example, a gene following an IRES sequence can have reduced expression over a gene preceding an IRES sequence. Reduced expression can be from 1% to 99% reduction over a preceding gene.

0117In certain embodiments, an IRES is an EMCV IRES comprising a nucleotide sequence having at least 70%, 75%, 80%, 85%, 90%, 95%, 99%, 99.5% or 100% identity with the nucleotide sequence of SEQ ID NO 18.

Linkers

0118Also disclosed are constructs that comprise a linker to facilitate the expression and functionality of the polynucleotides and polypeptides described herein. In some embodiments, a polynucleotide linker can be utilized in a polynucleotide described herein. A polynucleotide linker can be a double-stranded segment of DNA containing desired restriction sites that may be added to create end structures that are compatible with a vector comprising a polynucleotide described herein. In some cases, a polynucleotide linker can be useful for modifying vectors comprising polynucleotides described herein. For example, a vector modification comprising a polynucleotide linker can be a change in a multiple cloning site, or the addition of a poly-histidine tail. Polynucleotide linkers can also be used to adapt the ends of blunt insert DNA for cloning into a vector cleaved with a restriction enzyme with cohesive end termini. The use of polynucleotide linkers can be more efficient than a blunt ligation into a vector and can provide a method of releasing an insert from a vector in downstream applications. In some cases an insert can be a polynucleotide sequence encoding polypeptides useful for therapeutic applications. In some cases, a linker can be a cleavable linker.

0119A polynucleotide linker can be an oligomer. A polynucleotide linker can be a DNA double strand, single strand, or a combination thereof. In some cases, a linker can be RNA. A polynucleotide linker can be ligated into a vector comprising a polynucleotide described herein by a T4 ligase in some cases. To facilitate a ligation an excess of polynucleotide linkers can be added to a composition comprising an insert and a vector. In some cases, an insert and vector are pre-treated before a linker is introduced. For example, pre-treatment with a methylase can prevent unwanted cleavage of insert DNA.

0120In certain embodiments, two or more polypeptides encoded by a polynucleotide described herein can be separated by an intervening sequence encoding an intervening linker polypeptide. Herein the term "intervening linker polypeptide" referring to an amino acid sequence separating two or more polypeptides encoded by a polynucleotide is distinguished from the term "peptide linker" which refers to the sequence of amino acids which is optionally included in a polypeptide construct disclosed herein to connect the transmembrane domain to the cell surface polypeptide (<i>e.g</i>., comprising a truncated variant of a natural polypeptide). In certain cases, the intervening linker is a cleavage-susceptible intervening linker polypeptide. In some embodiments, the linker is a cleavable or ribosome skipping linker. In some embodiments, the cleavable linker or ribosome skipping linker sequence is selected from the group consisting of 2A, GSG-2A, GSG linker, SGSG linker, furinlink variants and derivatives thereof. In some embodiments, the 2A linker is a p2A linker, a T2A linker, F2A linker or E2A linker. In some embodiments, polypeptides of interest are expressed as fusion proteins linked by a cleavage-susceptible intervening linker polypeptide. In certain embodiments, cleavage-susceptible intervening linker polypeptide(s) can be any one or more of: F/T2A, T2A, p2A, 2A, GSG-p2A, GSG linker, and furinlink variants. In certain embodiments, the linker polypeptide comprises disclosed in the table below: <tables id="tabl0001" num="0001"><table frame="all"><title><b>Table 1.</b> Linker amino acid sequences and polynucleotide sequences</title><tgroup cols="5"><colspec colnum="1" colname="col1" colwidth="56mm" /><colspec colnum="2" colname="col2" colwidth="18mm" align="center" /><colspec colnum="3" colname="col3" colwidth="77mm" /><colspec colnum="4" colname="col4" colwidth="18mm" align="center" /><colspec colnum="5" colname="col5" colwidth="74mm" /><thead valign="middle"><row><entry><b>Linker Name</b></entry><entry><b>SEQ ID NO</b></entry><entry><b>Polynucleotide Sequence (5' to 3' where applicable)</b></entry><entry><b>SEQ ID NO</b></entry><entry><b>Amino Acids Sequence (5' to 3' where applicable)</b></entry></row></thead><tbody valign="middle"><row><entry>Whitlow Linker</entry><entry>1</entry><entry><img file="EP4382913A2_D0001.tif" /></entry><entry>146</entry><entry>GSTSGSGKPGSGEGSTKG</entry></row><row><entry>Linker</entry><entry>2</entry><entry><img file="EP4382913A2_D0002.tif" /></entry><entry>147</entry><entry><img file="EP4382913A2_D0003.tif" /></entry></row><row><entry>GSG linker</entry><entry>3</entry><entry>GGAAGCGGA</entry><entry>148</entry><entry>GSG</entry></row><row><entry>SGSG linker</entry><entry>4</entry><entry>AGTGGCAGCGGC</entry><entry>149</entry><entry>SGSG</entry></row><row><entry>(G4S)3 linker</entry><entry>5</entry><entry><img file="EP4382913A2_D0004.tif" /></entry><entry>150</entry><entry>GGGGSGGGGSGGGGS</entry></row><row><entry>Furin cleavage site/ Furinlink1</entry><entry>6</entry><entry>CGTGCAAAGCGT</entry><entry>151</entry><entry>RAKR</entry></row><row><entry>Fmdv</entry><entry>7</entry><entry><img file="EP4382913A2_D0005.tif" /></entry><entry>152</entry><entry><img file="EP4382913A2_D0006.tif" /></entry></row><row><entry>Thosea asigna virus 2A region (T2A)</entry><entry>8</entry><entry><img file="EP4382913A2_D0007.tif" /></entry><entry>153</entry><entry>EGRGSLLTCGDVEENPGP</entry></row><row><entry>Furin-GSG-T2A</entry><entry>9</entry><entry><img file="EP4382913A2_D0008.tif" /></entry><entry>154</entry><entry><img file="EP4382913A2_D0009.tif" /></entry></row><row><entry>Furin-SGSG-T2A</entry><entry>10</entry><entry><img file="EP4382913A2_D0010.tif" /></entry><entry>155</entry><entry><img file="EP4382913A2_D0011.tif" /></entry></row><row><entry>Porcine teschovirus-1 2A region (P2A)</entry><entry>11</entry><entry><img file="EP4382913A2_D0012.tif" /></entry><entry>156</entry><entry>ATNFSLLKQAGDVEENPGP</entry></row><row rowsep="0"><entry>GSG-P2A</entry><entry>12</entry><entry><img file="EP4382913A2_D0013.tif" /></entry><entry>157</entry><entry><img file="EP4382913A2_D0014.tif" /></entry></row><row><entry /><entry /><entry><img file="EP4382913A2_D0015.tif" /></entry><entry /><entry /></row><row><entry>Equine rhinitis A virus 2A region (E2A)</entry><entry>13</entry><entry><img file="EP4382913A2_D0016.tif" /></entry><entry>158</entry><entry><img file="EP4382913A2_D0017.tif" /></entry></row><row><entry>Foot-and-mouth disease virus 2A region (F2A)</entry><entry>14</entry><entry><img file="EP4382913A2_D0018.tif" /></entry><entry>159</entry><entry><img file="EP4382913A2_D0019.tif" /></entry></row><row><entry>FP2A</entry><entry>15</entry><entry><img file="EP4382913A2_D0020.tif" /></entry><entry>160</entry><entry><img file="EP4382913A2_D0021.tif" /></entry></row><row><entry>Linker-GSG</entry><entry>16</entry><entry><img file="EP4382913A2_D0022.tif" /></entry><entry>161</entry><entry>APVKQGSG</entry></row><row><entry>Linker</entry><entry>17</entry><entry>GCACCGGTGAAACAG</entry><entry>162</entry><entry>APVKQ</entry></row></tbody></tgroup></table></tables>

0121In some embodiments, an intervening linker polypeptide comprises an amino acid sequence having at least 70%, 75%, 80%, 85%, 90%, 95%, 99%, 99.5% or 100% identity with the amino acid sequence of Whitlow linker (SEQ ID NO 146), GSG linker (SEQ ID NO 148), SGSG linker (SEQ ID NO 149), (G4S)3 linker (SEQ ID NO 150), Furin cleavage site / Furlink1 (SEQ ID NO 151), Fmdv linker (SEQ ID NO 152), Thosea asigna virus 2A region (T2A) (SEQ ID NO 153), Furin-GSG-T2A (SEQ ID NO 154), Furin-SGSG-T2A (SEQ ID NO 155), porcine teschovirus-1 2A region (P2A) (SEQ ID NO 156), GSG-P2A (SEQ ID NO 157), equine rhinitis A virus 2A region (E2A) (SEQ ID NO 158), or foot-and-mouth disease virus 2A region (F2A) (SEQ ID NO: 159). In some cases, an intervening linker polypeptide comprises an amino acid sequence having at least 70%, 75%, 80%, 85%, 90%, 95%, 99%, 99.5% or 100% identity with the amino acid sequence of linkers (SEQ ID NOS 147, 161or 162) In some cases, a viral 2A sequence can be used. 2A elements can be shorter than IRES, having from 5 to 100 base pairs. In some cases, a 2A sequence can have 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, or 100 nucleotides in length. 2A linked genes can be expressed in one single open reading frame and "self-cleavage" can occur co-translationally between the last two amino acids, GP, at the C-terminus of the 2A polypeptide, giving rise to equal amounts of co-expressed proteins.

0122A viral 2A sequence can be about 20 amino acids. In some cases, a viral 2A sequence can contain a consensus motif Asp-Val/Ile-Glu-X-Asn-Pro-Gly-Pro. A consensus motif sequence can act co-translationally. For example, formation of a normal peptide bond between a glycine and proline residue can be prevented, which can result in ribosomal skipping and cleavage of a nascent polypeptide. This effect can produce multiple genes at equimolar levels.

0123A 2A peptide can allow translation of multiple proteins in a single open reading frame into a polypeptide that can be subsequently cleaved into individual polypeptide through a ribosome-skipping mechanism (Funston, Kallioinen et al. 2008). In some embodiments, a 2A sequence can include: F/T2A, T2A, p2A, 2A, T2A, E2A, F2A, and BmCPV2A, BmIFV2A, and any combination thereof.

0124In some cases, a vector can comprise an IRES sequence and a 2A linker sequence. In other cases, expression of multiple genes linked with 2A peptides can be facilitated by a spacer sequence (GSG) ahead of the 2A peptides. In some cases, constructs can combine a spacers, linkers, adaptors, promotors, or combinations thereof. For example, a linker can have a spacer (SGSG or GSG or Whitlow linker) and furin linker (R-A-K-R) cleavage site with different 2A peptides. A spacer can be an I-Ceui. In some cases, a linker can be engineered. For example, a linker can be designed to comprise chemical characteristics such as hydrophobicity. In some cases, at least two linker sequences can produce the same protein. In other cases, multiple linkers can be used in a vector. For example, genes of interest can be separated by at least two linkers, as shown in <figref idref="f0002 f0003 f0004 f0005"><b>FIG 2</b></figref> and <figref idref="f0006"><b>FIG 3</b></figref><b>.</b>

0125In certain embodiments, two or more polypeptides encoded by a polynucleotide described herein can be separated by an intervening sequence encoding a linker polypeptide. In certain cases, the linker is a cleavage-susceptible linker. In some embodiments, polypeptides of interest are expressed as fusion proteins linked by a cleavage-susceptible linker polypeptide. In certain embodiments, cleavage-susceptible linker polypeptide(s) can be any one or two of: Furinlink, fmdv, p2a, GSG-p2a, and/or fp2a described below. In some cases, a linker is APVKQGSG (SEQ ID NO 161).

0126In certain cases, a linker polypeptide can comprise an amino acid sequence "RAKR" (SEQ ID NO 151). In certain cases, a Furin linker polypeptide can be encoded by a polynucleotide sequence polynucleotide sequence comprising "CGTGCAAAGCGT" (SEQ ID NO 6) or "AGAGCTAAGAGG." (SEQ ID NO 9).

0127In some embodiments, a linker can be utilized in a polynucleotide described herein. A linker can be a flexible linker, a rigid linker, an <i>in vivo</i> cleavable linker, or any combination thereof. In some cases, a linker may link functional domains together (as in flexible and rigid linkers) or releasing free functional domain <i>in vivo</i> as in <i>in vivo</i> cleavable linkers.

0128Linkers may improve biological activity, increase expression yield, and achieving desirable pharmacokinetic profiles. A linker can also comprise hydrazone, peptide, disulfide, or thioesther.

0129In some cases, a linker sequence described herein can include a flexible linker. Flexible linkers can be applied when a joined domain requires a certain degree of movement or interaction. Flexible linkers can be composed of small, non-polar (<i>e.g.</i>, Gly) or polar (<i>e.g.</i>, Ser or Thr) amino acids. A flexible linker can have sequences consisting primarily of stretches of Gly and Ser residues ("GS" linker). An example of a flexible linker can have the sequence of (Gly-Gly-Gly-Gly-Ser)n (SEQ ID NO 150). By adjusting the copy number "n", the length of this exemplary GS linker can be optimized to achieve appropriate separation of functional domains, or to maintain necessary inter-domain interactions. Besides GS linkers, other flexible linkers can be utilized for recombinant fusion proteins. In some cases, flexible linkers can also be rich in small or polar amino acids such as Gly and Ser, but can contain additional amino acids such as Thr and Ala to maintain flexibility. In other cases, polar amino acids such as Lys and Glu can be used to improve solubility.

0130Flexible linkers included in linker sequences described herein, can be rich in small or polar amino acids such as Gly and Ser to provide good flexibility and solubility. Flexible linkers can be suitable choices when certain movements or interactions are desired for fusion protein domains. In addition, although flexible linkers may not have rigid structures, they can serve as a passive linker to keep a distance between functional domains. The length of flexible linkers can be adjusted to allow for proper folding or to achieve optimal biological activity of the fusion proteins.

0131A linker described herein can further include a rigid linker in some cases. A rigid linker may be utilized to maintain a fixed distance between domains of a polypeptide. Examples of rigid linkers can be: Alpha helix-forming linkers, Pro-rich sequence, (XP)n, X-Pro backbone, A(EAAAK)nA (n = 2-5), to name a few. Rigid linkers can exhibit relatively stiff structures by adopting α-helical structures or by containing multiple Pro residues in some cases.

0132A linker described herein can be cleavable in some cases. In other cases a linker is not cleavable. Linkers that are not cleavable may covalently join functional domains together to act as one molecule throughout an <i>in vivo</i> processes or an <i>ex vivo</i> process. A linker can also be cleavable <i>in vivo.</i> A cleavable linker can be introduced to release free functional domains <i>in vivo.</i> A cleavable linker can be cleaved by the presence of reducing reagents, proteases, to name a few. For example, a reduction of a disulfide bond may be utilized to produce a cleavable linker. In the case of a disulfide linker, a cleavage event through disulfide exchange with a thiol, such as glutathione, could produce a cleavage. In other cases, an <i>in vivo</i> cleavage of a linker in a recombinant fusion protein may also be carried out by proteases that can be expressed <i>in vivo</i> under pathological conditions (<i>e.g</i>. cancer or inflammation), in specific cells or tissues, or constrained within certain cellular compartments. In some cases, a cleavable linker may allow for targeted cleavage. For example, the specificity of many proteases can offer slower cleavage of a linker in constrained compartments. A cleavable linker can also comprise hydrazone, peptides, disulfide, or thioesther. For example, a hydrazone can confer serum stability. In other cases, a hydrazone can allow for cleavage in an acidic compartment. An acidic compartment can have a pH up to 7. A linker can also include a thioether. A thioether can be nonreducible A thioether can be designed for intracellular proteolytic degradation.

0133In certain embodiments, an fmdv linker polypeptide comprises a sequence that can be at least about 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 152. In certain embodiments, an fmdv linker polypeptide is one or more of the linkers encoded in a single vector linking two or more fusion proteins. In certain cases, an fmdv linker polypeptide can be encoded by a polynucleotide open reading frame (ORF) nucleic acid sequence. In some cases, an ORF encoding fmdv comprises or consists of a sequence of SEQ ID NO 7). In certain embodiments, a polynucleotide encoding fmdv is at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 7).

0134In certain cases, a linker polypeptide can be a "p2a" linker. In certain embodiments, a p2a polypeptide can comprise a sequence that can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 156). In certain embodiments, the p2a linker polypeptide can be one or more of the linkers encoded in a single vector linking two or more fusion proteins. In some cases, a p2a linker polypeptide can be encoded by a polynucleotide open reading frame (ORF) nucleic acid sequence. In certain embodiments, an ORF encoding p2a comprises or consists of the sequence of SEQ ID NO 11). In certain cases, a polynucleotide encoding p2a can be or can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 11).

0135In some cases, a linker polypeptide can be a "GSG-p2a" linker. In certain embodiments, a GSG-p2a linker polypeptide can comprise a sequence that can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 157). In certain embodiments, a GSG-p2a linker polypeptide can be one or more of the linkers encoded in a single vector linking two or more fusion proteins. In some cases, a GSG-p2a linker polypeptide can be encoded by a polynucleotide open-reading frame (ORF) nucleic acid sequence. An ORF encoding GSG p2a can comprise the sequence of SEQ ID NO 12). In some cases, a polynucleotide encoding GSG-p2a can be or can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 12).

0136A linker polypeptide can be an "fp2a" linker as provided herein. In certain embodiments, a fp2a linker polypeptide can comprise a sequence that can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 160). In certain cases, an fp2a linker polypeptide can be one or more of the linkers encoded in a single vector linking two or more fusion proteins. In some cases, a fp2a linker polypeptide can be encoded by a polynucleotide open reading frame (ORF) nucleic acid sequence. In certain embodiments, a polynucleotide encoding an fp2a linker can be or can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 15).

0137In some cases, a linker can be engineered. For example, a linker can be designed to comprise chemical characteristics such as hydrophobicity. In some cases, at least two linker sequences can produce the same protein. A sequence can be or can be about 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% , or 100% identical to a polypeptide sequence of SEQ ID NOS 147, 161 or 162. In other cases, multiple linkers can be used in a vector. For example, genes of interest, and one or more gene switch polypeptide sequences described herein can be separated by at least two linkers, as shown in <figref idref="f0021 f0022"><b>FIG 15</b></figref> and <figref idref="f0023 f0024"><b>FIG 16</b></figref><b>.</b> In some cases, genes can be separated by 2, 3, 4, 5, 6, 7, 8, 9, or up to 10 linkers.

0138A linker can be an engineered linker. Methods of designing linkers can be computational. In some cases, computational methods can include graphic techniques. Computation methods can be used to search for suitable peptides from libraries of three-dimensional peptide structures derived from databases. For example, a Brookhaven Protein Data Bank (PDB) can be used to span the distance in space between selected amino acids of a linker.

0139In some embodiments are polynucleotides encoding a polypeptide construct comprising a furin polypeptide and a 2A polypeptide, wherein the furin polypeptide and the 2A polypeptide are connected by a polypeptide linker comprising at least three hydrophobic amino acids. In some cases, at least three hydrophobic amino acids are selected from the list consisting of glycine (Gly)(G), alanine (Ala)(A), valine (Val)(V), leucine (Leu)(L), isoleucine (Ile)(I), proline (Pro)(P), phenylalanine (Phe)(F), methionine (Met)(M), tryptophan (Trp)(W). In some cases, a polypeptide linker may also include one or more GS linker sequences, for instance (GS)n, (SG)n, (GSG)n (SEQ ID NO: 78) and (SGSG)n (SEQ ID NO: 79) wherein n can be any number from zero to fifteen.

0140Provided are methods of obtaining an improved expression of a polypeptide construct comprising: providing a polynucleotide encoding said polypeptide construct comprising a first functional polypeptide and a second functional polypeptide, wherein said first functional polypeptide and second functional polypeptide are connected by a linker polypeptide comprising a sequence with at least 60% identity to the sequence APVKQ (SEQ ID NO 162); and expressing said polynucleotide in a host cell, wherein said expressing results in an improved expression of the polypeptide construct as compared to a corresponding polypeptide construct that does not have a linker polypeptide comprising a sequence with at least 60% identity to the sequence APVKQ.

Promoters

0141"Promoter" refers to a region of a polynucleotide that initiates transcription of a coding sequence. Promoters are located near the transcription start sites of genes, on the same strand and upstream on the DNA (towards the 5' region of the sense strand). Some promoters are constitutive as they are active in all circumstances in the cell, while others are regulated becoming active in response to specific stimuli, e.g., an inducible promoter. Yet other promoters are tissue specific or activated promoters, including but not limited to T-cell specific promoters.

0142The term "promoter activity" and its grammatical equivalents as used herein refer to the extent of expression of nucleotide sequence that is operably linked to the promoter whose activity is being measured. Promoter activity may be measured directly by determining the amount of RNA transcript produced, for example by Northern blot analysis or indirectly by determining the amount of product coded for by the linked nucleic acid sequence, such as a reporter nucleic acid sequence linked to the promoter.

0143"Inducible promoter" as used herein refers to a promoter which is induced into activity by the presence or absence of transcriptional regulators, <i>e.g</i>., biotic or abiotic factors. Inducible promoters are useful because the expression of genes operably linked to them can be turned on or off at certain stages of development of an organism or in a particular tissue. Examples of inducible promoters are alcohol-regulated promoters, tetracycline-regulated promoters, steroid-regulated promoters, metal-regulated promoters, pathogenesis-regulated promoters, temperature-regulated promoters and light-regulated promoters. In one embodiment, the inducible promoter is part of a genetic switch. The inducible promoter can be a gene switch ligand inducible promoter. In some cases, an inducible promoter can be a small molecule ligand-inducible two polypeptide ecdysone receptor-based gene switch, such as RHEOSWITCH^® gene switch. In some cases, a gene switch can be selected from ecdysone-based receptor components as described in, but without limitation to, any of the systems described in: <patcit id="pcit0008" dnum="US2001009050W"><text>PCT/US2001/009050</text></patcit> (<patcit id="pcit0009" dnum="WO2001070816A"><text>WO 2001/070816</text></patcit>); <patcit id="pcit0010" dnum="US7091038B"><text>U.S. Pat. Nos. 7,091,038</text></patcit>; <patcit id="pcit0011" dnum="US7776587B"><text>7,776,587</text></patcit>; <patcit id="pcit0012" dnum="US7807417B"><text>7,807,417</text></patcit>; <patcit id="pcit0013" dnum="US8202718B"><text>8,202,718</text></patcit>; <patcit id="pcit0014" dnum="US2001030608W"><text>PCT/US2001/030608</text></patcit> (<patcit id="pcit0015" dnum="WO2002029075A"><text>WO 2002/029075</text></patcit>); <patcit id="pcit0016" dnum="US8105825B"><text>U.S. Pat. Nos. 8,105,825</text></patcit>; <patcit id="pcit0017" dnum="US8168426B"><text>8,168,426</text></patcit>; <patcit id="pcit0018" dnum="WO1J52002005235A"><text>PCT/1J52002/005235</text></patcit> (<patcit id="pcit0019" dnum="WO2002066613A"><text>WO 2002/066613</text></patcit>); <patcit id="pcit0020" dnum="US468200"><text>U.S. App. No. 10/468,200</text></patcit> (<patcit id="pcit0021" dnum="US20120167239A"><text>U.S. Pub. No. 20120167239</text></patcit>); <patcit id="pcit0022" dnum="US2002005706W"><text>PCT/US2002/005706</text></patcit> (<patcit id="pcit0023" dnum="WO2002066614A"><text>WO 2002/066614</text></patcit>); <patcit id="pcit0024" dnum="US7531326B"><text>U.S. Pat. Nos. 7,531,326</text></patcit>; <patcit id="pcit0025" dnum="US8236556B"><text>8,236,556</text></patcit>; <patcit id="pcit0026" dnum="US8598409B"><text>8,598,409</text></patcit>; <patcit id="pcit0027" dnum="WOU52002005090A"><text>PCT/U52002/005090</text></patcit> (<patcit id="pcit0028" dnum="WO2002066612A"><text>WO 2002/066612</text></patcit>); <patcit id="pcit0029" dnum="US8715959B"><text>U.S. Pat. No. 8,715,959</text></patcit> (<patcit id="pcit0030" dnum="US20060100416A"><text>U.S. Pub. No. 20060100416</text></patcit>); <patcit id="pcit0031" dnum="US2002005234W"><text>PCT/US2002/005234</text></patcit> (<patcit id="pcit0032" dnum="WO2003027266A"><text>WO 2003/027266</text></patcit>); <patcit id="pcit0033" dnum="US7601508B"><text>U.S. Pat. Nos. 7,601,508</text></patcit>; <patcit id="pcit0034" dnum="US7829676B"><text>7,829,676</text></patcit>; <patcit id="pcit0035" dnum="US7919269B"><text>7,919,269</text></patcit>; <patcit id="pcit0036" dnum="US8030067B"><text>8,030,067</text></patcit>; <patcit id="pcit0037" dnum="WOU52002005708A"><text>PCT/U52002/005708</text></patcit> (<patcit id="pcit0038" dnum="WO2002066615A"><text>WO 2002/066615</text></patcit>); <patcit id="pcit0039" dnum="US468192"><text>U.S. App. No. 10/468,192</text></patcit> (<patcit id="pcit0040" dnum="US20110212528A"><text>U.S. Pub. No. 20110212528</text></patcit>); <patcit id="pcit0041" dnum="US2002005026W"><text>PCT/US2002/005026</text></patcit> (<patcit id="pcit0042" dnum="WO2003027289A"><text>WO 2003/027289</text></patcit>); <patcit id="pcit0043" dnum="US7563879B"><text>U.S. Pat. Nos. 7,563,879</text></patcit>; <patcit id="pcit0044" dnum="US8021878B"><text>8,021,878</text></patcit>; <patcit id="pcit0045" dnum="US8497093B"><text>8,497,093</text></patcit>; <patcit id="pcit0046" dnum="US2005015089W"><text>PCT/US2005/015089</text></patcit> (<patcit id="pcit0047" dnum="WO2005108617A"><text>WO 2005/108617</text></patcit>); <patcit id="pcit0048" dnum="US7935510B"><text>U.S. Pat. No. 7,935,510</text></patcit>; <patcit id="pcit0049" dnum="US8076454B"><text>8,076,454</text></patcit>; <patcit id="pcit0050" dnum="WOU52008011270A"><text>PCT/U52008/011270</text></patcit> (<patcit id="pcit0051" dnum="WO2009045370A"><text>WO 2009/045370</text></patcit>); <patcit id="pcit0052" dnum="US241018"><text>U.S. App. No. 12/241,018</text></patcit> (<patcit id="pcit0053" dnum="US20090136465A"><text>U.S. Pub. No. 20090136465</text></patcit>); <patcit id="pcit0054" dnum="US2008011563W"><text>PCT/US2008/011563</text></patcit> (<patcit id="pcit0055" dnum="WO2009048560A"><text>WO 2009/048560</text></patcit>); <patcit id="pcit0056" dnum="US247738"><text>U.S. App. No. 12/247,738</text></patcit> (<patcit id="pcit0057" dnum="US20090123441A"><text>U.S. Pub. No. 20090123441</text></patcit>); <patcit id="pcit0058" dnum="US2009005510W"><text>PCT/US2009/005510</text></patcit> (<patcit id="pcit0059" dnum="WO2010042189A"><text>WO 2010/042189</text></patcit>); <patcit id="pcit0060" dnum="US123129A"><text>U.S. App. No. 13/123,129</text></patcit> (<patcit id="pcit0061" dnum="US20110268766A"><text>U.S. Pub. No. 20110268766</text></patcit>); <patcit id="pcit0062" dnum="US2011029682W"><text>PCT/US2011/029682</text></patcit> (<patcit id="pcit0063" dnum="WO2011119773A"><text>WO 2011/119773</text></patcit>); <patcit id="pcit0064" dnum="US636473"><text>U.S. App. No. 13/636,473</text></patcit> (<patcit id="pcit0065" dnum="US20130195800A"><text>U.S. Pub. No. 20130195800</text></patcit>); <patcit id="pcit0066" dnum="US2012027515W"><text>PCT/US2012/027515</text></patcit> (<patcit id="pcit0067" dnum="WO2012122025A"><text>WO 2012/122025</text></patcit>); and, <patcit id="pcit0068" dnum="US9402919B"><text>U.S. Pat. No. 9,402,919</text></patcit> each of which is incorporated by reference in its entirety).

0144Provided herein are methods comprising administering to a subject at least one non-viral vector comprising a polynucleotide encoding a polypeptide sequence described herein comprising at least two functional proteins or portions thereof; at least one promotor; and at least one engineered recombination site; wherein said at least one promoter drives expression of said at least two functional proteins. In some cases, at least one promotor can be constitutive. In some cases, at least one promoter can be tissue-specific. In some cases, at least one promoter can be inducible. In some cases, an inducible promoter is a small molecule ligand-inducible two polypeptide ecdysone receptor-based gene switch. In other cases, a combination of promoters wherein at least one promoter can be inducible and at least one promoter can be activation specific can be utilized.

0145An inducible promoter utilizes a ligand for dose-regulated control of expression of said at least two genes. In some cases, a ligand can be selected from a group consisting of ecdysteroid, 9-cis-retinoic acid, synthetic analogs of retinoic acid, N,N'-diacylhydrazines, oxadiazolines, dibenzoylalkyl cyanohydrazines, N-alkyl-N,N'-diaroylhydrazines, N-acyl-N-alkylcarbonylhydrazines, N-aroyl-N-alkyl-N'-aroylhydrazines, arnidoketones, 3,5-di-tert-butyl-4-hydroxy-N-isobutyl-benzamide, 8-O-acetylharpagide, oxysterols, 22(R) hydroxycholesterol, 24(S) hydroxycholesterol, 25-epoxycholesterol, T0901317, 5-alpha-6-alpha-epoxycholesterol-3-sulfate (ECHS), 7-ketocholesterol-3-sulfate, framesol, bile acids, 1,1-biphosphonate esters, juvenile hormone III, RG-115819 (3,5 -Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethylpropyl)-N'-(2-methyl-3-methoxy-benzoyl)-hydrazide- ), RG-115932 ((R)-3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide), and RG-115830 (3,5 -Dimethyl-b enzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide), and any combination thereof.

0146In some embodiments, a promoter is an inducible promoter. In some embodiments, a promoter is a non-inducible promoter. In some cases, a promoter can be a tissue-specific promoter. Herein "tissue-specific" refers to regulated expression of a gene in a subset of tissues or cell types. In some cases, a tissue-specific promoter can be regulated spatially such that the promoter drives expression only in certain tissues or cell types of an organism. In other cases, a tissue-specific promoter can be regulated temporally such that the promoter drives expression in a cell type or tissue differently across time, including during development of an organism. In some cases, a tissue-specific promoter is regulated both spatially and temporally. In certain embodiments, a tissue-specific promoter is activated in certain cell types either constitutively or intermittently at particular times or stages of the cell type. For example, a tissue-specific promoter can be a promoter that is activated when a specific cell such as a T cell or a NK cell is activated. T cells can be activated in a variety of ways, for example, when presented with peptide antigens by MHC class II molecules or when an engineered T cells comprising an antigen binding polypeptide engages with an antigen. In one instance, such an engineered T cell or NK cell expresses a chimeric antigen receptor (CAR) or T-cell receptor (TCR).

0147In one case, at least one promoter is an engineered promoter or variants thereof. As described herein, the promoter can incorporate minimal promoter sequences from IL-2 and one or more of the following: nuclear factor of activated T-cells (NFAT) response element(s) such as SEQ ID NO 51; NFIL2D response element, NFkB/TCF response element, NF_AT/NFIL2B response element or NFIL2A/OCT response element. Examples of response elements are described in <nplcit id="ncit0025" npl-type="s"><text>Mattila et al., EMBO J. 1990 December; 9(13): 4425-4433</text></nplcit>; incorporated herein in its entirety.

0148In some embodiments, at least one promoter comprises IL-2 core promoter (SEQ ID NO 40). In one embodiment, at least one promoter comprises IL-2 minimal promoter (SEQ ID NO 41). In another embodiment, at least one promoter comprises IL-2 enhancer and promoter variant (SEQ ID NOS 42-43). In yet another embodiment, at least one promoter comprises NF-κB binding site (SEQ ID NOS 44-46). In some embodiments, at least one promoter comprises (NF-κB)₁-IL2 promoter variant (SEQ ID NO 47). In some embodiments, at least one promoter comprises (NF-κB)₃-IL2 promoter variant (SEQ ID NO 48). In some embodiments, at least one promoter comprises (NF-κB)₆-IL2 promoter variant (SEQ ID NO 49). In one embodiments, at least one promoter comprises 1X NFAT response elements-IL2 promoter variant (SEQ ID NO 50). In another embodiments, at least one promoter comprises nuclear factor of activated T-cells (NFAT) response element (SEQ ID NO 51). In yet another embodiment, at least one promoter comprises 6X NFAT response elements-IL2 promoter variant (SEQ ID NOS 52-55). In yet another embodiment, at least one promoter comprises 3X NFAT response elements-IL2 promoter variant (SEQ ID NOS 56-57). In some embodiments, at least one promoter comprises human EF1A1 promoter variant (SEQ ID NOS 58-59). In some embodiment, at least one promoter comprises human EF1A1 promoter and enhancer (SEQ ID NO 60). In some embodiments, at least one promoter comprises human UBC promoter (SEQ ID NO 61). In some embodiments, at least one promoter comprises 6 site GAL4-inducible proximal factor binding element (PFB) (SEQ ID NO 62). In some embodiment, at least one promoter comprises synthetic minimal promoter 1 (inducible promoter) (SEQ ID NO 63). Human IL-2 gene and 5' flanking region comprises a nucleotide sequence of SEQ ID NO 95.

0149Use of gene switch for ligand inducible control of IL-12 expression described herein can improve the safety profile of IL-12 by for example allowing for regulated expression and improving therapeutic index. However, a condition for ligand dose dependent expression of IL-12 using gene switch(es) is the presence or absence of activator ligand (<i>e.g</i>. veledimex). In certain embodiments, an additional conditional control for induction of IL-12 expression is contemplated. Gene switch components under the control of T cell activated specific promoters are provided. This results in conditional expression (<i>e.g</i>.,T cell activation) of gene switch components necessary for veledimex controlled expression of transgene(s) under control of a gene switch. In some embodiments, this results in preferential expression of cytokines such as IL-12 or IL-15 by tumor specific T cells when veledimex is present and T cells are activated. This may lead to increased localized levels of gene switch controlled transgene expression.

0150For example, T cell activation specific expression of gene switch components can be controlled by promoter comprising Nuclear Factor of Activated T-cells (NFAT) response element(s). NFAT transcription factors are key modulators of effector T-cell states. NFATs are early transcriptional checkpoint progressively driving exhaustion. NFATs are quickly activated in T cells following TCR stimulation and form a protein complex with AP-1 induced by appropriate co-stimulation signaling and regulate effector genes and T-cell functions. NFAT response element(s) can be fused with other minimal promoter sequences (<i>e.g</i>. IL2 minimal promoter) to drive expression of transgenes in response to T cell activation.

0151Other examples of activation specific promoters include but are not limited to interleukin-2 (IL2) promoter and Programmed Death (PD)-1 (CD279) promoter. Gene switch components can also be conditionally expressed upon immune cell activation by fusing binding sites for other nuclear factors like NF-κB of proinflammatory signaling pathway to minimal promoter sequence (e.g. IL2).

0152In some embodiments, the promoter comprises NF-κB binding site (SEQ ID NOS 44-46), nuclear factor of activated T cells (NFAT) response element (SEQ ID NO 51), 6 site GAL4-inducible proximal factor binding element (PFB) (SEQ ID NO 62) or synthetic 5' UTR based on RPL6 (SEQ ID NO 64). In certain embodiments, the promoter can be any one or more of: IL-2 core promoter, IL-2 minimal promoter, IL-2 enhancer and promoter variant, (NF-κB)₁-IL2 promoter variant, (NF-κB)₃-IL2 promoter variant, (NF-κB)₆-IL2 promoter variant, 1X NFAT response elements-IL2 promoter variant, 3X NFAT response elements-IL2 promoter variant, 6X NFAT response elements-IL2 promoter variant, human EEF1A1 promoter variant, human EEF1A1 promoter and enhancer, human UBC promoter and synthetic minimal promoter 1. In certain embodiments, the promoter nucleotides comprise disclosed in the table below: <tables id="tabl0002" num="0002"><table frame="all"><title><b>Table 2.</b> Promoter polynucleotide sequences</title><tgroup cols="3"><colspec colnum="1" colname="col1" colwidth="13mm" /><colspec colnum="2" colname="col2" colwidth="36mm" /><colspec colnum="3" colname="col3" colwidth="118mm" /><thead valign="middle"><row><entry align="center"><b>SEQ ID NO</b></entry><entry><b>Promoter</b></entry><entry><b>Polynucleotide Sequence (5' to 3' where applicable)</b></entry></row></thead><tbody><row valign="middle"><entry align="center">40</entry><entry>IL-2 core promoter</entry><entry><img file="EP4382913A2_D0023.tif" /></entry></row><row valign="middle"><entry align="center">41</entry><entry>IL-2 minimal promoter</entry><entry><img file="EP4382913A2_D0024.tif" /></entry></row><row valign="middle"><entry align="center">42</entry><entry>IL-2 enhancer and promoter variant</entry><entry><img file="EP4382913A2_D0025.tif" /></entry></row><row valign="middle"><entry align="center">43</entry><entry>L-2 enhancer and promoter variant</entry><entry><img file="EP4382913A2_D0026.tif" /></entry></row><row valign="middle"><entry align="center">47</entry><entry>(NF-κB)₁-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0027.tif" /></entry></row><row valign="middle"><entry align="center">48</entry><entry>(NF-κB)₃-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0028.tif" /></entry></row><row valign="middle"><entry align="center">49</entry><entry>(NF-κB)₆-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0029.tif" /></entry></row><row valign="middle"><entry align="center">50</entry><entry>1X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0030.tif" /></entry></row><row valign="middle"><entry align="center">56</entry><entry>3X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0031.tif" /></entry></row><row valign="middle"><entry align="center">57</entry><entry>3X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0032.tif" /></entry></row><row valign="middle"><entry align="center">52</entry><entry>6X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0033.tif" /></entry></row><row valign="middle"><entry align="center">53</entry><entry>6X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0034.tif" /></entry></row><row valign="middle"><entry align="center">54</entry><entry>6X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0035.tif" /></entry></row><row valign="middle"><entry align="center">55</entry><entry>6X NFAT response elements-IL2 promoter variant</entry><entry><img file="EP4382913A2_D0036.tif" /></entry></row><row valign="middle"><entry align="center">58</entry><entry>human EEF1A1 promoter variant</entry><entry><img file="EP4382913A2_D0037.tif" /></entry></row><row valign="middle"><entry align="center">59</entry><entry>human EEF1A1 promoter variant</entry><entry><img file="EP4382913A2_D0038.tif" /></entry></row><row valign="middle"><entry align="center">60</entry><entry>human EEF1A1 promoter and enhancer</entry><entry><img file="EP4382913A2_D0039.tif" /></entry></row><row valign="middle"><entry align="center" /><entry /><entry><img file="EP4382913A2_D0040.tif" /></entry></row><row valign="middle"><entry align="center">61</entry><entry>human UBC promoter</entry><entry><img file="EP4382913A2_D0041.tif" /></entry></row><row rowsep="0" valign="middle"><entry align="center">63</entry><entry>synthetic minimal promoter 1</entry><entry><img file="EP4382913A2_D0042.tif" /></entry></row><row><entry /><entry /><entry><img file="EP4382913A2_D0043.tif" /></entry></row></tbody></tgroup></table></tables>

Gene Switch

0153Provided herein are gene switch polypeptides, polynucleotides encoding ligand-inducible gene switch polypeptides, and methods and systems incorporating these polypeptides and/or polynucleotides.

0154The term "gene switch" or "genetic switch" refers to the combination of a response element associated with a promoter, and for instance, an EcR based system which, in the presence of one or more ligands, modulates the expression of a gene into which the response element and promoter are incorporated. Tightly regulated inducible gene expression systems or gene switches are useful for various applications such as gene therapy, large scale production of proteins in cells, cell based high throughput screening assays, functional genomics and regulation of traits in transgenic plants and animals. Such inducible gene expression systems may include ligand inducible heterologous gene expression systems.

0155An early version of EcR-based gene switch used Drosophila melanogaster EcR (DmEcR) and Mus musculus RXR (MmRXR) polypeptides and showed that these receptors in the presence of steroid, ponasteroneA, transactivate reporter genes in mammalian cell lines and transgenic mice (Christopherson et al., 1992; No et al., 1996). Later, Suhr et al., 1998 showed that non-steroidal ecdysone agonist, tebufenozide, induced high level of transactivation of reporter genes in mammalian cells through Bombyx mori EcR (BmEcR) in the absence of exogenous heterodimer partner.

0156International Patent Applications No. <patcit id="pcit0069" dnum="US9705330W"><text>PCT/US97/05330</text></patcit> (<patcit id="pcit0070" dnum="WO9738117A"><text>WO 97/38117</text></patcit>) and <patcit id="pcit0071" dnum="US9908381W"><text>PCT/US99/08381</text></patcit> (<patcit id="pcit0072" dnum="WO9958155A"><text>WO99/58155</text></patcit>) disclose methods for modulating the expression of an exogenous gene in which a DNA construct comprising the exogenous gene and an ecdysone response element is activated by a second DNA construct comprising an ecdysone receptor that, in the presence of a ligand therefor, and optionally in the presence of a receptor capable of acting as a silent partner, binds to the ecdysone response element to induce gene expression. In this example, the ecdysone receptor was isolated from Drosophila melanogaster. Typically, such systems require the presence of the silent partner, preferably retinoid X receptor (RXR), in order to provide optimum activation. In mammalian cells, insect ecdysone receptor (EcR) is capable of heterodimerizing with mammalian retinoid X receptor (RXR) and, thereby, be used to regulate expression of target genes or heterologous genes in a ligand dependent manner. International Patent Application No. <patcit id="pcit0073" dnum="US9814215W"><text>PCT/US98/14215</text></patcit> (<patcit id="pcit0074" dnum="WO9902683A"><text>WO 99/02683</text></patcit>) discloses that the ecdysone receptor isolated from the silk moth Bombyx mori is functional in mammalian systems without the need for an exogenous dimer partner. In some embodiments, the RXR comprises a nucleotide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 69 or a polypeptide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 182. In some embodiments, the gene switch comprises VP16-linker-RxR, wherein the VP16-linker-RXR comprises a nucleotide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 70 or a polypeptide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 183.

0157<patcit id="pcit0075" dnum="US6265173B"><text>U.S. Pat. No. 6,265,173</text></patcit> discloses that various members of the steroid/thyroid superfamily of receptors can combine with Drosophila melanogaster ultraspiracle receptor (USP) or fragments thereof comprising at least the dimerization domain of USP for use in a gene expression system. <patcit id="pcit0076" dnum="US5880333A"><text>U.S. Pat. No. 5,880,333</text></patcit> discloses a Drosophila melanogaster EcR and ultraspiracle (USP) heterodimer system used in plants in which the transactivation domain and the DNA binding domain are positioned on two different hybrid proteins. In each of these cases, the transactivation domain and the DNA binding domain (either as native EcR as in International Patent Application No. <patcit id="pcit0077" dnum="US9814215W"><text>PCT/US98/14215</text></patcit> or as modified EcR as in International Patent Application No. <patcit id="pcit0078" dnum="US9705330W"><text>PCT/US97/05330</text></patcit>) were incorporated into a single molecule and the other heterodimeric partners, either USP or RXR, were used in their native state. In some embodiments, the gene switch comprises EcR ligand binding domain - VY variant, wherein the EcR ligand binding domain - VY variant comprises a nucleotide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 72 or 73 or a polypeptide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 185 or 186. In other embodiments, the gene switch comprises GAL4-linker-EcR, wherein the GAL4-linker-EcR comprises a nucleotide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 74 or 75 or a polypeptide at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO 187 or 188.

0158International Patent Application No. <patcit id="pcit0079" dnum="US010905W"><text>PCT/US01/0905</text></patcit> discloses an ecdysone receptor-based inducible gene expression system in which the transactivation and DNA binding domains are separated from each other by placing them on two different proteins results in greatly reduced background activity in the absence of a ligand and significantly increased activity over background in the presence of a ligand. This two-hybrid system is a significantly improved inducible gene expression modulation system compared to the two systems disclosed in applications <patcit id="pcit0080" dnum="US9705330W"><text>PCT/US97/05330</text></patcit> and <patcit id="pcit0081" dnum="US9814215W"><text>PCT/US98/14215</text></patcit>. The two-hybrid system is believed to exploit the ability of a pair of interacting proteins to bring the transcription activation domain into a more favorable position relative to the DNA binding domain such that when the DNA binding domain binds to the DNA binding site on the gene, the transactivation domain more effectively activates the promoter (see, for example, <patcit id="pcit0082" dnum="US5283173A"><text>U.S. Pat. No. 5,283,173</text></patcit>). The two-hybrid gene expression system comprises two gene expression cassettes; the first encoding a DNA binding domain fused to a nuclear receptor polypeptide, and the second encoding a transactivation domain fused to a different nuclear receptor polypeptide. In the presence of ligand, it is believed that a conformational change is induced which promotes interaction of the first polypeptide with the second polypeptide thereby resulting in dimerization of the DNA binding domain and the transactivation domain. Since the DNA binding and transactivation domains reside on two different molecules, the background activity in the absence of ligand is greatly reduced.

0159Another surprising discovery was that certain modifications of the two-hybrid system could also provide improved sensitivity to non-steroidal ligands for example, diacylhydrazines, when compared to steroidal ligands for example, ponasterone A ("PonA") or muristerone A ("MurA"). That is, when compared to steroids, the non-steroidal ligands provided higher gene transcription activity at a lower ligand concentration. Furthermore, the two-hybrid system avoids some side effects due to overexpression of RXR that can occur when unmodified RXR is used as a switching partner. In a preferred two-hybrid system, native DNA binding and transactivation domains of EcR or RXR are eliminated and as a result, these hybrid molecules have less chance of interacting with other steroid hormone receptors present in the cell, thereby resulting in reduced side effects.

0160The ecdysone receptor (EcR) is a member of the nuclear receptor superfamily and is classified into subfamily 1, group H (referred to herein as "Group H nuclear receptors"). The members of each group share 40-60% amino acid identity in the E (ligand binding) domain (<nplcit id="ncit0026" npl-type="s"><text>Laudet et al., A Unified Nomenclature System for the Nuclear Receptor Subfamily, 1999; Cell 97: 161-163</text></nplcit>). In addition to the ecdysone receptor, other members of this nuclear receptor subfamily 1, group H include: ubiquitous receptor (UR), Orphan receptor 1 (OR-1), steroid hormone nuclear receptor 1 (NER-1), RXR interacting protein-15 (RIP-15), liver x receptor β (LXRβ), steroid hormone receptor like protein (RLD-1), liver x receptor (LXR), liver x receptor α (LXRα), farnesoid x receptor (FXR), receptor interacting protein 14 (RIP-14), and farnesol receptor (HRR-1).

0161In some cases, an inducible promoter can be a small molecule ligand-inducible two polypeptide ecdysone receptor-based gene switch, such as Intrexon Corporation's RHEOSWITCH^® gene switch. In some cases, a gene switch can be selected from ecdysone-based receptor components as described in, but without limitation to, any of the systems described in: <patcit id="pcit0083" dnum="US2001009050W"><text>PCT/US2001/009050</text></patcit> (<patcit id="pcit0084" dnum="WO2001070816A"><text>WO 2001/070816</text></patcit>); <patcit id="pcit0085" dnum="US7091038B"><text>U.S. Pat. Nos. 7,091,038</text></patcit>; <patcit id="pcit0086" dnum="US7776587B"><text>7,776,587</text></patcit>; <patcit id="pcit0087" dnum="US7807417B"><text>7,807,417</text></patcit>; <patcit id="pcit0088" dnum="US8202718B"><text>8,202,718</text></patcit>; <patcit id="pcit0089" dnum="US2001030608W"><text>PCT/US2001/030608</text></patcit> (<patcit id="pcit0090" dnum="WO2002029075A"><text>WO 2002/029075</text></patcit>); <patcit id="pcit0091" dnum="US8105825B"><text>U.S. Pat. Nos. 8,105,825</text></patcit>; <patcit id="pcit0092" dnum="US8168426B"><text>8,168,426</text></patcit>; <patcit id="pcit0093" dnum="WO1J52002005235A"><text>PCT/1J52002/005235</text></patcit> (<patcit id="pcit0094" dnum="WO2002066613A"><text>WO 2002/066613</text></patcit>); <patcit id="pcit0095" dnum="US468200"><text>U.S. App. No. 10/468,200</text></patcit> (<patcit id="pcit0096" dnum="US20120167239A"><text>U.S. Pub. No. 20120167239</text></patcit>); <patcit id="pcit0097" dnum="US2002005706W"><text>PCT/US2002/005706</text></patcit> (<patcit id="pcit0098" dnum="WO2002066614A"><text>WO 2002/066614</text></patcit>); <patcit id="pcit0099" dnum="US7531326B"><text>U.S. Pat. Nos. 7,531,326</text></patcit>; <patcit id="pcit0100" dnum="US8236556B"><text>8,236,556</text></patcit>; <patcit id="pcit0101" dnum="US8598409B"><text>8,598,409</text></patcit>; <patcit id="pcit0102" dnum="USU52002005090W"><text>PCT/U52002/005090</text></patcit> (<patcit id="pcit0103" dnum="WO2002066612A"><text>WO 2002/066612</text></patcit>); <patcit id="pcit0104" dnum="US8715959B"><text>U.S. Pat. No. 8,715,959</text></patcit> (<patcit id="pcit0105" dnum="US20060100416A"><text>U.S. Pub. No. 20060100416</text></patcit>); <patcit id="pcit0106" dnum="US2002005234W"><text>PCT/US2002/005234</text></patcit> (<patcit id="pcit0107" dnum="WO2003027266A"><text>WO 2003/027266</text></patcit>); <patcit id="pcit0108" dnum="US7601508B"><text>U.S. Pat. Nos. 7,601,508</text></patcit>; <patcit id="pcit0109" dnum="US7829676B"><text>7,829,676</text></patcit>; <patcit id="pcit0110" dnum="US7919269B"><text>7,919,269</text></patcit>; <patcit id="pcit0111" dnum="US8030067B"><text>8,030,067</text></patcit>; <patcit id="pcit0112" dnum="USU52002005708W"><text>PCT/U52002/005708</text></patcit> (<patcit id="pcit0113" dnum="WO2002066615A"><text>WO 2002/066615</text></patcit>); <patcit id="pcit0114" dnum="US468192"><text>U.S. App. No. 10/468,192</text></patcit> (<patcit id="pcit0115" dnum="US20110212528A"><text>U.S. Pub. No. 20110212528</text></patcit>); <patcit id="pcit0116" dnum="US2002005026W"><text>PCT/US2002/005026</text></patcit> (<patcit id="pcit0117" dnum="WO2003027289A"><text>WO 2003/027289</text></patcit>); <patcit id="pcit0118" dnum="US7563879B"><text>U.S. Pat. Nos. 7,563,879</text></patcit>; <patcit id="pcit0119" dnum="US8021878B"><text>8,021,878</text></patcit>; <patcit id="pcit0120" dnum="US8497093B"><text>8,497,093</text></patcit>; <patcit id="pcit0121" dnum="US2005015089W"><text>PCT/US2005/015089</text></patcit> (<patcit id="pcit0122" dnum="WO2005108617A"><text>WO 2005/108617</text></patcit>); <patcit id="pcit0123" dnum="US7935510B"><text>U.S. Pat. No. 7,935,510</text></patcit>; <patcit id="pcit0124" dnum="US8076454B"><text>8,076,454</text></patcit>; <patcit id="pcit0125" dnum="USU52008011270W"><text>PCT/U52008/011270</text></patcit> (<patcit id="pcit0126" dnum="WO2009045370A"><text>WO 2009/045370</text></patcit>); <patcit id="pcit0127" dnum="US241018"><text>U.S. App. No. 12/241,018</text></patcit> (<patcit id="pcit0128" dnum="US20090136465A"><text>U.S. Pub. No. 20090136465</text></patcit>); <patcit id="pcit0129" dnum="US2008011563W"><text>PCT/US2008/011563</text></patcit> (<patcit id="pcit0130" dnum="WO2009048560A"><text>WO 2009/048560</text></patcit>); <patcit id="pcit0131" dnum="US247738"><text>U.S. App. No. 12/247,738</text></patcit> (<patcit id="pcit0132" dnum="US20090123441A"><text>U.S. Pub. No. 20090123441</text></patcit>); <patcit id="pcit0133" dnum="US2009005510W"><text>PCT/US2009/005510</text></patcit> (<patcit id="pcit0134" dnum="WO2010042189A"><text>WO 2010/042189</text></patcit>); <patcit id="pcit0135" dnum="US123129A"><text>U.S. App. No. 13/123,129</text></patcit> (<patcit id="pcit0136" dnum="US20110268766A"><text>U.S. Pub. No. 20110268766</text></patcit>); <patcit id="pcit0137" dnum="US2011029682W"><text>PCT/US2011/029682</text></patcit> (<patcit id="pcit0138" dnum="WO2011119773A"><text>WO 2011/119773</text></patcit>); <patcit id="pcit0139" dnum="US636473"><text>U.S. App. No. 13/636,473</text></patcit> (<patcit id="pcit0140" dnum="US20130195800A"><text>U.S. Pub. No. 20130195800</text></patcit>); <patcit id="pcit0141" dnum="US2012027515W"><text>PCT/US2012/027515</text></patcit> (<patcit id="pcit0142" dnum="WO2012122025A"><text>WO 2012/122025</text></patcit>); and, <patcit id="pcit0143" dnum="US9402919B"><text>U.S. Pat. No. 9,402,919</text></patcit> each of which is incorporated by reference in its entirety.

0162Provided are systems for modulating the expression of a heterologous gene and an interleukin in a host cell, comprising polynucleotides expressing gene-switch polypeptides disclosed herein. Various structural components of non-limiting exemplary ligand-inducible gene switch vector system under the control of constitutive or inducible promoters are shown in <figref idref="f0038"><b>FIG. 22</b></figref>.

0163In some embodiments, the expression cassette of the gene switch vector system is XON-64 and has a sequence as shown in SEQ ID NO: 131. In some embodiments, the expression cassette of the gene switch vector system is XON-30 and has a sequence as shown in SEQ ID NO: 132. In some embodiments, the expression cassette of the gene switch vector system is XON-59 and has a sequence as shown in SEQ ID NO: 133. In some embodiments, the expression cassette of the gene switch vector system is XON-60 and has a sequence as shown in SEQ ID NO: 134. In some embodiments, the expression cassette of the gene switch vector system is XON-61 and has a sequence as shown in SEQ ID NO: 135. In some embodiments, the expression cassette of the gene switch vector system is XON-62 and has a sequence as shown in SEQ ID NO: 136.

0164In some embodiments are systems for modulating the expression of a heterologous gene and a cytokine in a host cell, comprising a first gene expression cassette comprising a first polynucleotide encoding a first polypeptide; a second gene expression cassette comprising a second polynucleotide encoding a second polypeptide; and a ligand; wherein said first and second polypeptides comprise one or more of: (i) a transactivation domain; (ii) a DNA-binding domain; and (iii) a ligand binding domain; (iv) said heterologous gene; and (vi) said cytokine such that upon contacting said host cell with said first gene expression cassette and said second gene expression cassette in the presence of said ligand, said heterologous gene and said cytokine are expressed in said host cell. In some cases, the heterologous gene comprises an antigen binding polypeptide described herein. In some cases, the antigen binding polypeptide may be a CAR described herein, for instance, a CAR that binds at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.

<i>Cytokines</i>

0165Provided herein are polynucleotides encoding gene-switch polypeptides and a cytokine, or variant or derivative thereof, and methods and systems incorporating the same. Cytokine is a category of small proteins between about 5-20 kDa that are involved in cell signaling. In some instances, cytokines include chemokines, interferons, interleukins, colony-stimulating factors or tumor necrosis factors. In some embodiments, chemokines play a role as a chemoattractant to guide the migration of cells, and is classified into four subfamilies: CXC, CC, CX3C, and XC. Exemplary chemokines include chemokines from the CC subfamily: CCL1, CCL2 (MCP-1), CCL3, CCL4, CCL5 (RANTES), CCL6, CCL7, CCL8, CCL9 (or CCL10), CCL11, CCL12, CCL13, CCL14, CCL15, CCL16, CCL17, CCL18, CCL19, CCL20, CCL21, CCL22, CCL23, CCL24, CCL25, CCL26, CCL27, and CCL28; the CXC subfamily: CXCL1, CXCL2, CXCL3, CXCL4, CXCL5, CXCL6, CXCL7, CXCL8, CXCL9, CXCL10, CXCL11, CXCL12, CXCL13, CXCL14, CXCL15, CXCL16, and CXCL17; the XC subfamily: XCL1 and XCL2; and the CX3C subfamily CX3CL1.

0166Interferons (IFNs) comprise interferon type I (<i>e.g.</i> IFN-α, IFN-β, IFN-ε, IFN-κ, and IFN-ω), interferon type II (<i>e.g.</i> IFN-γ), and interferon type III. In some embodiments, IFN-α is further classified into about 13 subtypes including IFNA1, IFNA2, IFNA4, IFNA5, IFNA6, IFNA7, IFNA8, IFNA10, IFNA13, IFNA14, IFNA16, IFNA17, and IFNA21.

0167Interleukins are expressed by leukocytes or white blood cells and they promote the development and differentiation of T and B lymphocytes and hematopoietic cells. Exemplary interleukines include IL-1, IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, IL-8 (CXCL8), IL-9, IL-10, IL-11, IL-12, IL-13, IL-14, IL-15, IL-16, IL-17, IL-18, IL-19, IL-20, IL-21, IL-22, IL-23, IL-24, IL-25, IL-26, IL-27, IL-28, IL-29, IL-30, IL-31, IL-32, IL-33, IL-35, and IL-36.

0168In some embodiments, an interleukin comprises mbII,-15. In some embodiments, a mbIL-15 is a membrane-bound chimeric IL-15 which can be co-expressed with a modified effector cell described herein. In some embodiments, the mbII,-15 comprises a full-length IL-15 (<i>e.g</i>., a native IL-15 polypeptide) or fragment or variant thereof, fused in frame with a full length IL-15Rα, functional fragment or variant thereof. In some cases, the IL-15 is indirectly linked to the IL-15Rα through a linker. In some instances, the mbIL-15 is as described in Hurton et al., "Tethered IL-15 augments antitumor activity and promotes a stem-cell memory subset in tumor-specific T cells," PNAS 2016.

0169Tumor necrosis factors (TNFs) are a group of cytokines that modulate apoptosis. In some instances, there are about 19 members within the TNF family, including, not limited to, TNFα, lymphotoxin-alpha (LT-alpha), lymphotoxin-beta (LT-beta), T cell antigen gp39 (CD40L), CD27L, CD30L, FASL, 4-1BBL, OX40L, and TNF-related apoptosis inducing ligand (TRAIL).

0170Colony-stimulating factors (CSFs) are secreted glycoproteins that interact with receptor proteins on the surface of hemopoietic stem cells, which subsequently modulates cell proliferation and differentiation into specific kind of blood cells. In some instances, a CSF comprises macrophage colony-stimulating factor, granulocyte macrophage colony-stimulating factor (GM-CSF), granulocyte colony-stimulating factor (G-CSF) or promegapoietin.

0171In some embodiments, the cytokine is a membrane-bound cytokine, which is co-expressed with a chimeric antigen receptor described herein.

0172In some embodiments, one or more methods described herein further comprise administration of a cytokine. In some instances, the cytokine comprises a chemokine, an interferon, an interleukin, a colony-stimulating factor or a tumor necrosis factor. In some instances, one or more methods described herein further comprise administration of a cytokine selected from a chemokine, an interferon, an interleukin, a colony-stimulating factor or a tumor necrosis factor. In some instances, one or more methods described herein further comprise administration of a cytokine selected from IL2, IL7, IL12, IL15, IL21, IFNγ or TNF-α.

0173In some cases, the cytokine comprises at least one chemokine, interferon, interleukin, lymphokine, tumor necrosis factor, or variant or combination thereof. In some cases, the cytokine is an interleukin. In some cases, the interleukin is at least one of IL-12, IL-2, IL-15, IL-21, and functional variants and fragments thereof. In some embodiments, the cytokine is at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In one embodiment, the cytokine is a variant of IL-15 (SEQ ID NO 90; SEQ ID NO 203). In one embodiment, the cytokine comprises IL-15 receptor alpha (SEQ ID NO 91; SEQ ID NO 204). In some embodiments, the cytokines can be membrane bound or secreted. In other embodiments, the cytokines can be intracellular. The interleukin may comprise membrane bound IL-15 (mbII,-15), a fusion of IL-15 and IL-15Rα (SEQ ID NO 91; SEQ ID NO 204) or an IL-15 (SEQ ID NO 90; SEQ ID NO 203) variant. In some embodiments, a mbIL-15 is a membrane-bound chimeric IL-15 which can be co-expressed with a modified effector cell described herein. In some embodiments, the mbIL-15 comprises a full-length IL-15 (<i>e.g</i>., a native IL-15 polypeptide) or fragment or variant thereof, fused in frame with a full length IL-15Rα, functional fragment or variant thereof. In some cases, the IL-15 is indirectly linked to the IL-15Rα through a linker. In some embodiments, the mbIL-15 comprises a signal peptide (SEQ ID NO 92; SEQ ID NO 205). In some instances, the mbIL-15 is as described in Hurton et al., "Tethered IL-15 augments antitumor activity and promotes a stem-cell memory subset in tumor-specific T cells," PNAS 2016. In another aspect, the interleukin can comprise IL-12. In some embodiments, IL-12 can be a single chain IL-12 (scIL-12), protease sensitive IL-12\, destabilized IL-12, membrane bound IL-12 or intercalated IL-12. In some embodiments, IL-12 is murine IL-12 subunit beta (p40) (SEQ ID NO 206). In some embodiments, IL-12 is murine IL-12 subunit alpha (p35) (SEQ ID NO 207). In some embodiments, IL-12 is murine single chain IL-12 (p40-linker-p35) (SEQ ID NO 93; SEQ ID NO 208). In some embodiments, IL-12 is human single chain IL-12 (p40-linker-p35) (SEQ ID NO 94; SEQ ID NO 209). In certain embodiments, IL-12 is single chain IL-12. In some instances, the IL-12 variants are as described in <patcit id="pcit0144" dnum="WO2015095249A"><text>WO2015/095249</text></patcit>, <patcit id="pcit0145" dnum="WO2016048903A"><text>WO2016/048903</text></patcit>, and <patcit id="pcit0146" dnum="WO2017062953A"><text>WO2017/062953</text></patcit>, all of which are incorporated by reference in their entireties.

0174Provided herein are polynucleotides encoding gene switch polypeptides, wherein said gene switch polypeptides comprise: a) a first gene switch polypeptide comprising a DNA-binding domain fused to a nuclear receptor ligand binding domain, and b) a second gene switch polypeptide comprising a transactivation domain fused to a nuclear receptor ligand binding domain, wherein the first gene switch polypeptide and the second gene switch polypeptide are connected by a linker. In some cases, the linker may be a linker described herein, for instance GSG linker, furinlink, a 2A linker such as F/T2A, T2A, p2A, GSG-p2A, variants and derivatives thereof. In other instances, the linker may be an IRES. In some embodiments, the IRES is EMCV IRES or 2xRbm3 IRES. Exemplary IRES sequences can be found in SEQ ID NO: 18 and 19. In certain cases, a polynucleotide encoding 2xRbm3 IRES a can be or can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO: 19. In certain cases, a polynucleotide encoding EMCV IRES a can be or can be about at least 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99% or 100% identical to SEQ ID NO: 18.

0175In some cases, the DNA binding domain (DBD) comprises a DBD described herein, for instance at least one of GAL4 (GAL4 DBD) (SEQ ID NO 71; SEQ ID NO 184), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD. The transactivation domain may comprise a transactivation domain described herein, for instance one of a VP16 transactivation domain (SEQ ID NO 68; SEQ ID NO 181), a p53 transactivation domain and a B42 acidic activator transactivation domain. The Nuclear receptor ligand binding domain may comprise at least one of a ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, a NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor.

0176In some cases, the gene switch polypeptides connected by a polypeptide linker or ribosome-skipping sequence exhibit improved dose-dependent ligand-inducible control of gene expression compared to a ligand-inducible gene switch wherein the gene switch polypeptides are connected by non-coding sequences, such as an IRES. In some cases, the gene switch polypeptides connected by a 2A linker may exhibit improved dose-dependent ligand-inducible control of heterologous gene expression compared to a gene switch wherein said gene switch polypeptides are separated by an IRES.

0177The polypeptides and polynucleotides as described herein can be expressed in an engineered cell. Herein an engineered cell is a cell which has been modified from its natural or endogenous state. An example of an engineered cell is a cell described herein which has been modified (<i>e.g</i>., by transfection of a polynucleotide into the cell) to encode for example, gene switch polypeptides, gene of interest (GOI), cell tags, heterologous genes and any other polypeptides and polynucleotides described herein.

<i>Ligands</i>

0178In some embodiments, a ligand used for inducible gene switch regulation can be selected from any of, but without limitation to, following: N-[(1R)-1-(1,1-dimethylethyl)butyl]-N'-(2-ethyl-3-methoxybenzoyl)-3,5-dimethylbenzohydrazide (also referred to as veledimex), (2S,3R,5R,9R,10R,13R,14S,17R)-17-[(2S,3R)-3,6-dihydroxy-6-methylheptan-2-yl]-2,3,14-trihydroxy-10,13-dimethyl- 2,3,4,5,9,11,12,15,16,17-decahydro- 1H-cyclopenta[a]phenanthren-6-one; N'-(3,5-Dimethylbenzoyl)-N'-[(3R)-2,2-dimethyl-3-hexanyl]-2-ethyl-3-methoxybenzohydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide; 5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methylbenzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxybenzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide; 2-Methoxy-nicotinic acid N-(1-tert-butyl-pentyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(2,2-dimethyl-1-phenylpropyl)-N'-(4-ethyl-benzoyl)-hydrazide; 3,5-Dimethyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; and 3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide.

0179In some cases, a ligand used for dose-regulated control of ecdysone receptor-based inducible gene switch can be selected from any of, but without limitation to, an ecdysteroid, such as ecdysone, 20-hydroxyecdysone, ponasterone A, muristerone A, and the like, 9-cis-retinoic acid, synthetic analogs of retinoic acid, N,N'-diacylhydrazines such as those disclosed in <patcit id="pcit0147" dnum="US6013836A"><text>U.S. Pat. Nos. 6,013,836</text></patcit>; <patcit id="pcit0148" dnum="US5117057A"><text>5,117,057</text></patcit>; <patcit id="pcit0149" dnum="US5530028A"><text>5,530,028</text></patcit>; and <patcit id="pcit0150" dnum="US5378726A"><text>5,378,726</text></patcit> and <patcit id="pcit0151" dnum="US20050209283A"><text>U.S. Published Application Nos. 2005/0209283</text></patcit> and <patcit id="pcit0152" dnum="US20060020146A"><text>2006/0020146</text></patcit>; oxadiazolines as described in <patcit id="pcit0153" dnum="US20040171651A"><text>U.S. Published Application No. 2004/0171651</text></patcit>; dibenzoylalkyl cyanohydrazines such as those disclosed in <patcit id="pcit0154" dnum="EP461809A"><text>European Application No. 461,809</text></patcit>; N-alkyl-N,N'-diaroylhydrazines such as those disclosed in <patcit id="pcit0155" dnum="US5225443A"><text>U.S. Pat. No. 5,225,443</text></patcit>; N-acyl-N-alkylcarbonylhydrazines such as those disclosed in <patcit id="pcit0156" dnum="EP234994A"><text>European Application No. 234,994</text></patcit>; N-aroyl-N-alkyl-N'-aroylhydrazines such as those described in <patcit id="pcit0157" dnum="US4985461A"><text>U.S. Pat. No. 4,985,461</text></patcit>; arnidoketones such as those described in <patcit id="pcit0158" dnum="US20040049037A"><text>U.S. Published Application No. 2004/0049037</text></patcit>; each of which is incorporated herein by reference and other similar materials including 3,5-di-tert-butyl-4-hydroxy-N-isobutyl-benzamide, 8-O-acetylharpagide, oxysterols, 22(R) hydroxycholesterol, 24(S) hydroxycholesterol, 25-epoxycholesterol, T0901317, 5-alpha-6-alpha-epoxycholesterol-3-sulfate (ECHS), 7-ketocholesterol-3-sulfate, framesol, bile acids, 1,1-biphosphonate esters, juvenile hormone III, and the like. Examples of diacylhydrazine ligands useful in the present disclosure include RG-115819 (3,5 -Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-methyl-3-methoxy-benzoyl)-hydrazide- ), RG-115932 ((R)-3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide), and RG-115830 (3,5 - Dimethyl-b enzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide). See, <i>e.g.,</i><patcit id="pcit0159" dnum="US155111"><text>U.S. patent application Ser. No. 12/155,111</text></patcit>, and PCT Appl. No. <patcit id="pcit0160" dnum="US2008006757W"><text>PCT/US2008/006757</text></patcit>, both of which are incorporated herein by reference in their entireties.

Antigen Binding Polypeptides

0180Polypeptides and proteins disclosed herein (including functional portions and functional variants thereof) may comprise synthetic amino acids in place of one or more naturally-occurring amino acids. Such synthetic amino acids are known in the art, and include, for example, aminocyclohexane carboxylic acid, norleucine, α-amino n-decanoic acid, homoserine, S-acetylaminomethyl-cysteine, trans-3- and trans-4-hydroxyproline, 4-aminophenylalanine, 4-nitrophenylalanine, 4-chlorophenylalanine, 4-carboxyphenylalanine, β-phenylserine β-hydroxyphenylalanine, phenylglycine, α-naphthylalanine, cyclohexylalanine, cyclohexylglycine, indoline-2-carboxylic acid, 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, aminomalonic acid, aminomalonic acid monoamide, N'-benzyl-N'-methyl-lysine, N',N'-dibenzyl-lysine, 6-hydroxylysine, ornithine, α-aminocyclopentane carboxylic acid, α-aminocyclohexane carboxylic acid, α-aminocycloheptane carboxylic acid, α-(2-amino-2-norbornane)-carboxylic acid, α,γ-diaminobutyric acid, α,β-diaminopropionic acid, homophenylalanine, and α-tert-butylglycine.

0181"Antibody" as used herein refers to monoclonal or polyclonal antibodies. The term "monoclonal antibodies," as used herein, refers to antibodies that are produced by a single clone of B-cells and bind to the same epitope. In contrast, "polyclonal antibodies" refer to a population of antibodies that are produced by different B-cells and bind to different epitopes of the same antigen. A whole antibody typically consists of four polypeptides: two identical copies of a heavy (H) chain polypeptide and two identical copies of a light (L) chain polypeptide. Each of the heavy chains contains one N-terminal variable (VH) region and three C-terminal constant (CH1, CH2 and CH3) regions, and each light chain contains one N-terminal variable (VL) region and one C-terminal constant (CL) region. The variable regions of each pair of light and heavy chains form the antigen binding site of an antibody. The VH and VL regions have a similar general structure, with each region comprising four framework regions, whose sequences are relatively conserved. The framework regions are connected by three complementarity determining regions (CDRs). The three CDRs, known as CDR1, CDR2, and CDR3, form the "hypervariable region" of an antibody, which is responsible for antigen binding.

0182"Antigen recognition moiety" or "antibody recognition domain" refers to a molecule or portion of a molecule that specifically binds to an antigen. In one embodiment, the antigen recognition moiety is an antibody, antibody like molecule or fragment thereof and the antigen is a tumor antigen or an infectious disease antigen.

0183"Antibody like molecules" may be for example proteins that are members of the Ig-superfamily which are able to selectively bind a partner. MHC molecules and T cell receptors are such molecules. In one embodiment the antibody-like molecule is a TCR. In one embodiment the TCR has been modified to increase its MHC binding affinity.

0184The terms "fragment of an antibody," "antibody fragment," "functional fragment of an antibody," "antigen-binding portion" or their grammatical equivalents are used interchangeably herein to mean one or more fragments or portions of an antibody that retain the ability to specifically bind to an antigen (see, generally, <nplcit id="ncit0027" npl-type="s"><text>Holliger et al., Nat. Biotech., 23(9):1126-1129 (2005</text></nplcit>)). The antibody fragment desirably comprises, for example, one or more CDRs, the variable region (or portions thereof), the constant region (or portions thereof), or combinations thereof. Examples of antibody fragments include, but are not limited to, (i) a Fab fragment, which is a monovalent fragment consisting of the VL, VH, CL, and CH1 domains; (ii) a F(ab')2 fragment, which is a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the stalk region; (iii) a Fv fragment consisting of the VL and VH domains of a single arm of an antibody; (iv) a single chain Fv (scFv), which is a monovalent molecule consisting of the two domains of the Fv fragment (<i>i.e</i>., VL and VH) joined by a synthetic linker which enables the two domains to be synthesized as a single polypeptide chain (see, <i>e.g</i>., <nplcit id="ncit0028" npl-type="s"><text>Bird et al., Science, 242: 423-426 (1988</text></nplcit>); <nplcit id="ncit0029" npl-type="s"><text>Huston et al., Proc. Natl. Acad. Sci. USA, 85: 5879-5883 (1988</text></nplcit>); and <nplcit id="ncit0030" npl-type="s"><text>Osbourn et al., Nat. Biotechnol., 16: 778 (1998</text></nplcit>)) and (v) a diabody, which is a dimer of polypeptide chains, wherein each polypeptide chain comprises a VH connected to a VL by a peptide linker that is too short to allow pairing between the VH and VL on the same polypeptide chain, thereby driving the pairing between the complementary domains on different VH-VL polypeptide chains to generate a dimeric molecule having two functional antigen binding sites. Antibody fragments are known in the art and are described in more detail in, <i>e.g</i>., <patcit id="pcit0161" dnum="US8603950B"><text>U.S. Pat. No. 8,603,950</text></patcit>. Other antibody fragments can include variable fragments of heavy chain antibodies (VHH).

0185The term "functional portion," when used in reference to a CAR, refers to any part or fragment of the CAR of the present disclosure, which part or fragment retains the biological activity of the CAR of which it is a part (the parent CAR). In reference to a nucleic acid sequence encoding the parent CAR, a nucleic acid sequence encoding a functional portion of the CAR can encode a protein comprising, for example, about 10%, 25%, 30%, 50%, 68%, 80%, 90%, 95%, or more, of the parent CAR.

0186The term "functional variant," as used herein, refers to a polypeptide, or a protein having substantial or significant sequence identity or similarity to the reference polypeptide, and retains the biological activity of the reference polypeptide of which it is a variant. In some embodiments, a functional variant, for example, comprises the amino acid sequence of the reference protein with at least or about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 conservative amino acid substitutions. Functional variants encompass, for example, those variants of the CAR described herein (the parent CAR) that retain the ability to recognize target cells to a similar extent, the same extent, or to a higher extent, as the parent CAR. In reference to a nucleic acid sequence encoding the parent CAR, a nucleic acid sequence encoding a functional variant of the CAR can be for example, about 10% identical, about 25% identical, about 30% identical, about 50% identical, about 65% identical, about 80% identical, about 90% identical, about 95% identical, or about 99% identical to the nucleic acid sequence encoding the parent CAR.

0187The term "conservative amino acid substitution" or "conservative mutation" refers to the replacement of one amino acid by another amino acid with a common property. A functional way to define common properties between individual amino acids is to analyze the normalized frequencies of amino acid changes between corresponding proteins of homologous organisms (<nplcit id="ncit0031" npl-type="b"><text>Schulz, G. E. and Schirmer, R. H., Principles of Protein Structure, Springer-Verlag, New York (1979</text></nplcit>)). According to such analyses, groups of amino acids may be defined where amino acids within a group exchange preferentially with each other, and therefore resemble each other most in their impact on the overall protein structure (Schulz, G. E. and Schirmer, R. H., supra). Examples of conservative mutations include amino acid substitutions of amino acids within the sub-groups above, for example, lysine for arginine and vice versa such that a positive charge may be maintained; glutamic acid for aspartic acid and vice versa such that a negative charge may be maintained; serine for threonine such that a free -OH can be maintained; and glutamine for asparagine such that a free -NH₂ can be maintained. Alternatively or additionally, the functional variants can comprise the amino acid sequence of the reference protein with at least one non-conservative amino acid substitution.

0188The term "non-conservative mutations" involve amino acid substitutions between different groups, for example, lysine for tryptophan, or phenylalanine for serine, etc. In this case, it is preferable for the non-conservative amino acid substitution to not interfere with, or inhibit the biological activity of, the functional variant. The non-conservative amino acid substitution may enhance the biological activity of the functional variant, such that the biological activity of the functional variant is increased as compared to the parent CAR.

0189In some embodiments, the antigen binding moiety of a CAR described herein is specific to or binds CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In embodiments, the antigen binding domain comprises a single chain antibody fragment (scFv) comprising a variable domain light chain (VL) and variable domain heavy chain (VH) of a target antigen specific monoclonal antibody joined by a flexible linker, such as a glycine-serine linker or a Whitlow linker. In embodiments, the scFv is humanized. In some embodiments, the antigen binding moiety may comprise VH and VL that are directionally linked, for example, from N to C terminus, VH-linker-VL or VL-linker-VH. In some instances, the antigen binding domain recognizes an epitope of the target. In some embodiments, described herein include a CAR or a CAR-T cell, in which the antigen binding domain comprises a F(ab')2, Fab', Fab, Fv, or scFv.

0190In one embodiment, the antigen binding moiety of a CAR described herein is specific to CD19. In one embodiment, the antigen binding moiety of a CAR described herein is specific to CD33. In another embodiment, the antigen binding moiety of a CAR described herein is specific to BCMA. In yet another embodiment, the antigen binding moiety of a CAR described herein is specific to CD44. In some embodiments, the antigen binding moiety of a CAR described herein is specific to α-Folate receptor. In some embodiments, the antigen binding moiety of a CAR described herein is specific to CAIX. In one embodiment, the antigen binding moiety of a CAR described herein is specific to CD30. In some embodiments, the antigen binding moiety of a CAR described herein is specific to ROR1. In one embodiment, the antigen binding moiety of a CAR described herein is specific to CEA. In some embodiments, the antigen binding moiety of a CAR described herein is specific to EGP-2. In one embodiment, the antigen binding moiety of a CAR described herein is specific to EGP-40. In another embodiment, the antigen binding moiety of a CAR described herein is specific to HER2. In yet another embodiment, the antigen binding moiety of a CAR described herein is specific to HER3. In yet another embodiment, the antigen binding moiety of a CAR described herein is specific to Folate-binding protein. In some embodiments, the antigen binding moiety of a CAR described herein is specific to GD2. In some embodiments, the antigen binding moiety of a CAR described herein is specific to GD3. In one embodiment, the antigen binding moiety of a CAR described herein is specific to IL-13R-a2. In one embodiment, the antigen binding moiety of a CAR described herein is specific to KDR. In one embodiment, the antigen binding moiety of a CAR described herein is specific to EDB-F. In another embodiment, the antigen binding moiety of a CAR described herein is specific to mesothelin. In yet another embodiment, the antigen binding moiety of a CAR described herein is specific to CD22. In one embodiment, the antigen binding moiety of a CAR described herein is specific to EGFR. In one embodiment, the antigen binding moiety of a CAR described herein is specific to MUC-1. In one embodiment, the antigen binding moiety of a CAR described herein is specific to MUC-16. In one embodiment, the antigen binding moiety of a CAR described herein is specific to MAGE-A1. In some embodiments, the antigen binding moiety of a CAR described herein is specific to h5T4. In some embodiments, the antigen binding moiety of a CAR described herein is specific to PSMA. In another embodiment, the antigen binding moiety of a CAR described herein is specific to TAG-72. In yet one embodiment, the antigen binding moiety of a CAR described herein is specific to EGFRvIII. In another embodiment, the antigen binding moiety of a CAR described herein is specific to CD123. In yet embodiment, the antigen binding moiety of a CAR described herein is specific to VEGF-R2.

Chimeric Antigen Receptors (CARs)

0191In some embodiments, described herein includes a polynucleotide which encodes a chimeric receptor expressed on the surface of the cell. In some instances, the chimeric receptor comprises an antigen binding region that enables recognition and binding to an antigen, for instance, a tumor antigen such as a tumor-associated antigen or a tumor-specific antigen. In some instances, the antigen binding region comprises an antibody or binding fragment, for example, an Fab, an Fab', an F(ab')2, an F(ab')3, an scFv, an sc(Fv)2, a dsFv, a diabody, a minibody, and a nanobody or binding fragments thereof. In some cases, the antigen binding region comprises an scFv. In some cases, the chimeric receptor comprises an scFv (<i>e.g</i>., a chimeric antigen receptor (CAR)). In some instances, the chimeric antigen receptor comprises a pattern-recognition receptor. In other cases, the chimeric receptor comprises an engineered T-cell receptor (TCR).

0192The terms "chimeric antigen receptor (CAR)", "artificial T cell receptor", "chimeric T cell receptor" or "chimeric immunoreceptor" as used herein refer to an engineered receptor which grafts an exogenous specificity onto an immune effector cell. In some instances, a CAR comprises an extracellular domain (ectodomain) that comprises an antigen binding domain, a stalk region, a transmembrane domain and an intracellular (endodomain) domain. In some instances, the intracellular domain further comprises one or more intracellular signaling domains. In some instances, a CAR described herein comprises an antigen binding domain, a stalk region, a transmembrane domain, one or more costimulatory domains, and a signaling domain for T-cell activation.

0193In embodiments, the CAR of the present disclosure comprises a target-specific binding element otherwise referred to as an antigen-binding moiety. In embodiments, the CAR of the present disclosure is engineered to target a tumor antigen of interest by way of engineering a desired antigen-binding moiety that specifically binds to an antigen on a tumor cell. In the context of the present disclosure, "tumor antigen" or "hyperproliferative disorder antigen" or "antigen associated with a hyperproliferative disorder," refers to antigens that are common to specific hyperproliferative disorders such as cancer.

0194An antigen binding domain can comprise complementary determining regions of a monoclonal antibody, variable regions of a monoclonal antibody, and/or antigen binding fragments thereof. A complementarity determining region (CDR) is a short amino acid sequence found in the variable domains of antigen receptor (<i>e.g</i>., immunoglobulin and T-cell receptor) proteins that complements an antigen and therefore provides the receptor with its specificity for that particular antigen. Each polypeptide chain of an antigen receptor can contain three CDRs (CDR1, CDR2, and CDR3). In some instances, an antigen binding domain comprises F(ab')2, Fab', Fab, Fv, or scFv. In some cases, an antigen binding domain is a scFv. In some cases, an antigen binding domain is a Fab. In some cases, an antigen binding domain is a Fab'. In some cases, an antigen binding domain is F(ab')2. In some cases, an antigen binding domain is a Fv.

0195In some embodiments, a CAR described herein comprises an antigen binding domain that binds to an epitope on CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD 123 and VEGF-R2. In some embodiments, a CAR described herein comprises an antigen binding domain that binds to an epitope on CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In some embodiments, a CAR described herein comprises an antigen binding domain that binds to an epitope on CD19, CD33 or EGFRvIII. In some instances, a CAR described herein comprises an antigen binding domain that binds to an epitope on CD19. In some cases, a CAR described herein comprises an antigen binding domain that binds to an epitope on CD33. In further embodiments, a CAR or a chimeric receptor or antigen binding polypeptide described herein comprises an autoantigen or an antigen binding region that binds to an epitope on HLA-A2, myelin oligodendrocyte glycoprotein (MOG), factor VIII (FVIII), MAdCAM1, SDF1, or collagen type II.

0196In another embodiment, a CAR described herein is a EGFRvIII specific CAR. "EGFRvIII", "EGFR variant III", "EGFR type III mutant", "EGFR.D2-7" or "de2-7EGFR" is a mutated form of epidermal growth factor receptor (EGFR; ErbB-1; HER1), a transmembrane protein that is a receptor for members of the epidermal growth factor (EGF) family of extracellular protein ligands in human and non-human subjects. EGFRvIII is characterized by a deletion of exons 2-7 of the wild type <i>EGFR</i> gene, which results in an in-frame deletion of 267 amino acids in the extracellular domain of the full length wild type EGFR protein. EGFRvIII also contains a novel glycine residue inserted at the fusion junction. The truncated receptor EGFRvIII is unable to bind any known EGFR ligand; however, it shows constitutive tyrosine kinase activity. This constitutive activation is important to its pro-oncogenic effect. A kinase-deficient EGFRvIII is unable to confer a similar oncogenic advantage. EGFRvIII is highly expressed in glioblastoma (GBM) and can be detected in some other solid tumor types but not in normal tissues.

0197In some embodiments, the antigen binding moiety of a CAR described herein is specific to EGFRvIII (EGFRvIII CAR). The EGFRvIII-specific CAR, when expressed on the cell surface, redirects the specificity of T cells to human EGFRvIII. In embodiments, the antigen binding domain comprises a single chain antibody fragment (scFv) comprising a variable domain light chain (VL) and variable domain heavy chain (VH) of a target antigen specific monoclonal anti-EGFRvIII antibody joined by a flexible linker, such as a glycine-serine linker or a Whitlow linker. In embodiments, the scFv is murine MR1 IgG. In some embodiments, the scFv is anti-EGFRvIII scFv clone MR1 (SEQ ID NO 115; SEQ ID NO 229), anti-EGFRvIII scFv clone MR1-1 (SEQ ID NO 116; SEQ ID NO 230), anti-EGFRvIII scFv clone huMR1-1 (SEQ ID NO 117; SEQ ID NO 231), anti-EGFRvIII scFv clone huMR1-2 (SEQ ID NO 118; SEQ ID NO 232). In some embodiments, the antigen binding moiety may comprise VH and VL that are directionally linked, for example, from N to C terminus, VH-linker-VL or VL-linker-VH.

0198In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VL polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 221 (anti-EGFRvIII clone MR1 VL). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VH polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 220 (anti-EGFRvIII clone MR1 VH). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VL polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 223 (anti-EGFRvIII clone MR1-1 VL). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VH polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 222 (anti-EGFRvIII clone MR1-1 VH).

0199In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VL polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 225 (anti-EGFRvIII clone humMR1-1 VL). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VH polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 224 (anti-EGFRvIII clone humMR1-1 VH). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VL polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 227 (anti-EGFRvIII clone humMR1-2 VL). In embodiments, a CAR described herein comprises an antigen-binding moiety comprising a VH polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 226 (anti-EGFRvIII clone humMR1-2 VH).

0200In one embodiment, a CAR described herein is a CD19 specific CAR. "CD19", cluster of differentiation 19 or B-lymphocyte antigen CD19, is a protein that in human is encoded by the <i>CD19</i> gene. The <i>CD19</i> gene encodes a cell surface molecule that assembles with the antigen receptor of B lymphocytes in order to decrease the threshold for antigen receptor-dependent stimulation. CD19 is expressed on follicular dendritic cells and B cells. In fact, it is present on B cells from earliest recognizable B-lineage cells during development to B-cell blasts but is lost on maturation to plasma cells. It primarily acts as a B cell co-receptor in conjunction with CD21 and CD81. Upon activation, the cytoplasmic tail of CD19 becomes phosphorylated, which leads to binding by Src-family kinases and recruitment of PI-3 kinase. As on T cells, several surface molecules form the antigen receptor and form a complex on B lymphocytes. The (almost) B cell-specific CD19 phosphoglycoprotein is one of these molecules. The others are CD21 and CD81. These surface immunoglobulin (sIg)-associated molecules facilitate signal transduction. On B cells, anti-immunoglobulin antibody mimicking exogenous antigen causes CD19 to bind to sIg and internalize with it. The reverse process has not been demonstrated, suggesting that formation of this receptor complex is antigen-induced. This molecular association has been confirmed by chemical studies.

0201In yet another embodiment, a CAR descried herein is a CD33 specific CAR. "CD33", Siglec-3, sialic acid binding Ig-like lectin 3, SIGLEC3, SIGLEC-3, gp67, or p67 is a 67kDa single pass transmembrane glycoprotein and is a member of the sialic acid-binding immunoglobulin-like lectins (Siglecs) super-family. CD33 is characterized by a V-set Ig-like domain responsible for sialic acid binding and a C2-set Ig-like domain in its extracellular domain. Alternative splicing of CD33 mRNA leads to a shorter isoform (CD33m) lacking the V-set Ig-like domain as well as the disulfide bond linking the V- and C2-set Ig-like domains. In healthy subjects, CD33 is primarily expressed as a myeloid differentiation antigen found on normal multipotent myeloid precursors, unipotent colony-forming cells, monocytes and maturing granulocytes. CD33 is expressed on more than 80% of myeloid leukemia cells but not on normal hematopoietic stem cells or mature granulocytes (<nplcit id="ncit0032" npl-type="s"><text>Andrews, R. et al., The L4F3 antigen is expressed by unipotent and multipotent colony-forming cells but not by their precursors, Blood, 68(5):1030-5 (1986</text></nplcit>)). CD33 has been reported to be expressed on malignant myeloid cells, activated T cells and activated NK cells and is found on at least a subset of blasts in the vast majority of AML patients (<nplcit id="ncit0033" npl-type="s"><text>Pollard, J. et al., Correlation of CD33 expression level with disease characteristics and response to gemtuzumab ozogamicin containing chemotherapy in childhood AML, Blood, 119(16):3705-11 (2012</text></nplcit>)). In addition to broad expression on AML blasts, CD33 may be expressed on stem cells underlying AML.

0202In embodiments, the antigen binding moiety of a CAR described herein is specific to CD33 (CD33 CAR). The CD33-specific CAR, when expressed on the cell surface, redirects the specificity of T cells to human CD33. In embodiments, the antigen binding domain comprises a single chain antibody fragment (scFv) comprising a variable domain light chain (VL) and variable domain heavy chain (VH) of a target antigen specific monoclonal anti-CD33 antibody joined by a flexible linker, such as a glycine-serine linker or a Whitlow linker. In embodiments, the scFv are M195, m2H12, DRB2, and/or My9-6. In embodiments, the scFv is humanized, for example, hM195. In some embodiments, the antigen binding moiety may comprise VH and VL that are directionally linked, for example, from N to C terminus, VH-linker-VL or VL-linker-VH. In some embodiments, the CD33 antigen binding domain comprises a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 214 (hM195 VL). In some embodiments, the CD33 antigen binding domain comprises a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 215 (hM195 VH). In some embodiments, the CD33 antigen binding domain comprises a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 216 (hM195 scFv with linker).

0203In some embodiments, the polynucleotides, polypeptides and methods described herein can be used for the treatment of a hyperproliferative disease, such as a cancer, an autoimmune disease or for the treatment of an infection, such as a viral, bacterial or parasitic infection. In some aspects, the antigen is an antigen that is elevated in cancer cells, in autoimmune cells or in cells that are infected by a virus, bacteria or parasite. Pathogens that may be targeted include, without limitation, Plasmodium, trypanosome, Aspergillus, Candida, Hepatitis A, Hepatitis B, Hepatitis C, HSV, HPV, RSV, EBV, CMV, JC virus, BK virus, or Ebola pathogens. Autoimmune diseases can include graft-versus-host disease, rheumatoid arthritis, lupus, celiac disease, Crohn's disease, Sjogren Syndrome, polymyalgia rheumatic, multiple sclerosis, neuromyelitis optica, ankylosing spondylitis, Type 1 diabetes, alopecia areata, vasculitis, temporal arteritis, bullous pemphigoid, psoriasis, pemphigus vulgaris, or autoimmune uveitis.

0204The pathogen recognized by a CAR may be essentially any kind of pathogen, but in some embodiments the pathogen is a fungus, bacteria, or virus. Exemplary viral pathogens include those of the families of Adenoviridae, Epstein-Barr virus (EBV), Cytomegalovirus (CMV), Respiratory Syncytial Virus (RSV), JC virus, BK virus, HPV, HSV, HHV family of viruses, Hepatitis family of viruses, Picornaviridae, Herpesviridae, Hepadnaviridae, Flaviviridae, Retroviridae, Orthomyxoviridae, Paramyxoviridae, Papovaviridae, Polyomavirus, Rhabdoviridae, and Togaviridae. Exemplary pathogenic viruses cause smallpox, influenza, mumps, measles, chickenpox, ebola, and rubella. Exemplary pathogenic fungi include Candida, Aspergillus, Cryptococcus, Histoplasma, Pneumocystis, and Stachybotrys. Exemplary pathogenic bacteria include Streptococcus, Pseudomonas, Shigella, Campylobacter, Staphylococcus, Helicobacter, E. coli, Rickettsia, Bacillus, Bordetella, Chlamydia, Spirochetes, and Salmonella. In some embodiments the pathogen receptor Dectin-1 may be used to generate a CAR that recognizes the carbohydrate structure on the cell wall of fungi such as Aspergillus. In another embodiment, CARs can be made based on an antibody recognizing viral determinants (<i>e.g</i>., the glycoproteins from CMV and Ebola) to interrupt viral infections and pathology.

0205In some embodiments, a "stalk", "stalk region" or "stalk domain", which encompasses the terms "spacer", "spacer region" or "spacer domain" or "hinge", "hinge region" or "hinge domain", is used to link the antigen-binding domain to the transmembrane domain. In some instances, a "stalk domain" or "stalk region" comprise any oligonucleotide- or polypeptide that functions to link the transmembrane domain to, either the extracellular domain or, the cytoplasmic domain in the polypeptide chain. In some embodiments, it is flexible enough to allow the antigen-binding domain to orient in different directions to facilitate antigen recognition. In some instances, the stalk region comprises the hinge region from IgG1. In alternative instances, the stalk region comprises the CH2CH3 region of immunoglobulin and optionally portions of CD3. In some cases, the stalk region comprises a CD8α hinge region (SEQ ID NO 29; SEQ ID NO 170), an IgG4-Fc 12 amino acid hinge region (ESKYGPPCPPCP) or IgG4 hinge regions as described in WO/2016/073755.

0206In some embodiments, the stalk region comprises at least one of a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of CD8 alpha 2X (SEQ ID NO 30; SEQ ID NO 171), CD8 alpha 3X (SEQ ID NO 31; SEQ ID NO 172) or CD8 alpha 4X (SEQ ID NO 32; SEQ ID NO 173).

0207In other embodiments, between the extracellular domain and the transmembrane domain of the CAR, there is incorporated a spacer. A spacer can comprise a stalk region and a stalk extension region. In one embodiment, a spacer can include a single stalk region. In another embodiment, a spacer can comprise a stalk region and stalk extension region(s). For example, a spacer can comprise one (1) stalk region and 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 stalk regions. In further embodiments, the stalk region can be linked to stalk extension region via a linker.

0208The transmembrane domain can be derived from either a natural or a synthetic source. Where the source is natural, the domain can be derived from any membrane-bound or transmembrane protein. Suitable transmembrane domains can include the transmembrane region(s) of alpha, beta or zeta chain of the T-cell receptor; or a transmembrane region from CD28, CD3 epsilon, CD3ζ, CD45, CD4, CD5, CD8alpha, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 or CD154. Alternatively the transmembrane domain can be synthetic, and can comprise hydrophobic residues such as leucine and valine. In some embodiments, a triplet of phenylalanine, tryptophan and valine is found at one or both termini of a synthetic transmembrane domain. Optionally, a short oligonucleotide or polypeptide linker, in some embodiments, between 2 and 10 amino acids in length may form the linkage between the transmembrane domain and the cytoplasmic signaling domain of a CAR. In some embodiments, the linker is a glycine-serine linker. In some embodiments, the transmembrane domain comprises a CD8α transmembrane domain or a CD3ζ transmembrane domain. In some embodiments, the transmembrane domain comprises a CD8α transmembrane domain. In other embodiments, the transmembrane domain comprises a CD3ζ transmembrane domain. In some embodiments, the transmembrane region comprises at least one of a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of CD8 alpha transmembrane domain (SEQ ID NO 174). In some embodiments, the transmembrane region comprises at least one of a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of CD28 transmembrane domain (SEQ ID NO 175).

0209The intracellular domain can comprise one or more costimulatory domains. Exemplary costimulatory domains include, but are not limited to, CD8, CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof. In some instances, a CAR described herein comprises one or more, or two or more of costimulatory domains selected from CD8, CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof. In some instances, a CAR described herein comprises one or more, or two or more of costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, OX40 (CD134) or fragment or combination thereof. In some instances, a CAR described herein comprises one or more, or two or more of costimulatory domains selected from CD8, CD28, 4-1BB (CD137), or fragment or combination thereof. In some instances, a CAR described herein comprises one or more, or two or more of costimulatory domains selected from CD28, 4-1BB (CD137), or fragment or combination thereof. In some instances, a CAR described herein comprises costimulatory domains CD28 and 4-1BB (CD137) or their respective fragments thereof. In some instances, a CAR described herein comprises costimulatory domains CD28 and OX40 (CD134) or their respective fragments thereof. In some instances, a CAR described herein comprises costimulatory domains CD8 and CD28 or their respective fragments thereof. In some instances, a CAR described herein comprises costimulatory domains CD28 or a fragment thereof. In some instances, a CAR described herein comprises costimulatory domains 4-1BB (CD137) or a fragment thereof. In some instances, a CAR described herein comprises costimulatory domains OX40 (CD134) or a fragment thereof. In some instances, a CAR described herein comprises costimulatory domains CD8 or a fragment thereof.

0210The intracellular signaling domain, also known as cytoplasmic domain, of the CAR of the present disclosure, is responsible for activation of at least one of the normal effector functions of the immune cell in which the CAR has been placed. The term "effector function" refers to a specialized function of a cell. Effector function of a T cell, for example, may be cytolytic activity or helper activity including the secretion of cytokines. Thus the term "intracellular signaling domain" refers to the portion of a protein which transduces the effector function signal and directs the cell to perform a specialized function. While usually the entire intracellular signaling domain can be employed, in many cases it is not necessary to use the entire chain. To the extent that a truncated portion of the intracellular signaling domain is used, such truncated portion may be used in place of the intact chain as long as it transduces the effector function signal. The term intracellular signaling domain is thus meant to include any truncated portion of the intracellular signaling domain sufficient to transduce the effector function signal. In some embodiments, the intracellular domain further comprises a signaling domain for T-cell activation. In some instances, the signaling domain for T-cell activation comprises a domain derived from TCR zeta, FcR gamma, FcR beta, CD3 gamma, CD3 delta, CD3 epsilon, CD5, CD22, CD79a, CD79b or CD66d. In some cases, the signaling domain for T-cell activation comprises a domain derived from CD3ζ.

0211In some embodiments, the intracellular signaling domain comprises at least one of a polypeptide having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of CD28 (SEQ ID NO 176), CD3 zeta signaling domain (SEQ ID NO 177), 4-1BB signaling domain (SEQ ID NO 178), DNAX-activation protein 10 (DAP 10) signaling domain (SEQ ID NO 179) or DNAX-activation protein 12 (DAP12) signaling domain (SEQ ID NO 180).

CD19 Specific CARs

0212CD19 is a cell surface glycoprotein of the immunoglobulin superfamily. In some instances, CD19 has been detected in solid tumors such as pancreatic cancer, liver cancer, and prostate cancer.

0213In some embodiments, the antigen binding moiety of a CAR described herein, is specific to CD19. A CD19-specific CAR, when expressed on the cell surface, may redirect the specificity of T cells to human CD19. In embodiments, the antigen binding domain comprises a single chain antibody fragment (scFv) comprising a variable domain light chain (VL) and variable domain heavy chain (VH) of a target antigen specific monoclonal anti-CD19 antibody joined by a flexible linker, such as a glycine-serine linker or a Whitlow linker. In embodiments, the scFv are SJ25C1 and/or FMC63. In embodiments, the scFv is humanized. In some embodiments, the antigen binding moiety may comprise VH and VL that are directionally linked, for example, from N to C terminus, VH-linker-VL or VL-linker-VH.

0214In some embodiments, described herein include a CD19-specific CAR, in which the antigen binding domain comprises a scFv that binds CD19. In some instances, the antigen binding domain recognizes an epitope on CD19.

0215In some embodiments, the antigen binding domain recognizes an epitope on CD19 that is also recognized by JCAR014, JCAR015, JCAR017, or 19-28z CAR (Juno Therapeutics). In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain recognizes an epitope on CD19 that is also recognized by JCAR014, JCAR015, JCAR017, or 19-28z CAR (Juno Therapeutics). In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0216In some embodiments, described herein include a CD19-specific CAR-T cell comprises a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by JCAR014, JCAR015, JCAR017, or 19-28z CAR (Juno Therapeutics). In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0217In some embodiments, a CD19-specific CAR-T cell described herein comprises an anti-CD19 antibody described in <patcit id="pcit0162" dnum="US20160152723A"><text>US20160152723</text></patcit>.

0218In some embodiments, the antigen binding domain recognizes an epitope on CD19 that is also recognized by KTE-C19 (Kite Pharma, Inc.). In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain recognizes an epitope on CD19 that is also recognized by KTE-C19. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0219In some embodiments, described herein include a CD19-specific CAR-T cell comprises a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by KTE-C19. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0220In some embodiments, a CD19-specific CAR-T cell described herein comprises an anti-CD19 antibody described in <patcit id="pcit0163" dnum="WO2015187528A"><text>WO2015187528</text></patcit> or fragment or derivative thereof.

0221In some embodiments, the antigen binding domain recognizes an epitope on CD19 that is also recognized by CTL019 (Novartis). In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain recognizes an epitope on CD19 that is also recognized by CTL019. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0222In some embodiments, described herein include a CD19-specific CAR-T cell comprises a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by CTL019. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0223In some embodiments, the antigen binding domain recognizes an epitope on CD19 that is also recognized by UCART19 (Cellectis). In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain recognizes an epitope on CD19 that is also recognized by UCART19. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0224In some embodiments, described herein include a CD19-specific CAR-T cell comprises a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by UCART19. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0225In some embodiments, the antigen binding domain recognizes an epitope on CD19 that is also recognized by BPX-401 (Bellicum). In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain recognizes an epitope on CD19 that is also recognized by BPX-401. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10,DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0226In some embodiments, described herein include a CD19-specific CAR-T cell comprises a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by BPX-401. In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0227In some cases, the antigen binding domain recognizes an epitope on CD19 that is also recognized by blinatumomab (Amgen), coltuximabravtansine (ImmunoGen Inc./Sanofi-aventis), MOR208 (Morphosys AG/Xencor Inc.), MEDI-551 (Medimmune), denintuzumabmafodotin (Seattle Genetics), B4 (or DI-B4) (Merck Serono), taplitumomabpaptox (National Cancer Institute), XmAb 5871 (Amgen/Xencor, Inc.), MDX-1342 (Medarex) or AFM11 (Affimed). In some instances, the CD19-specific CAR further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0228In some embodiments, described herein include a CD19-specific CAR-T cell, in which the antigen binding domain comprises a F(ab')2, Fab', Fab, Fv, or scFv. In some instances, the antigen binding domain recognizes an epitope on CD19. In some cases, the antigen binding domain recognizes an epitope on CD19 that is also recognized by blinatumomab (Amgen), coltuximabravtansine (ImmunoGen Inc./Sanofi-aventis), MOR208 (Morphosys AG/Xencor Inc.), MEDI-551 (Medimmune), denintuzumabmafodotin (Seattle Genetics), B4 (or DI-B4) (Merck Serono), taplitumomabpaptox (National Cancer Institute), XmAb 5871 (Amgen/Xencor, Inc.), MDX-1342 (Medarex) or AFM11 (Affimed). In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, DAP12, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0229In some cases, a CD19-specific CAR-T cell described herein comprise a scFv antigen binding domain, and the antigen binding domain recognizes an epitope on CD 19 that is also recognized by blinatumomab (Amgen), coltuximabravtansine (ImmunoGen Inc./Sanofi-aventis), MOR208 (Morphosys AG/Xencor Inc.), MEDI-551 (Medimmune), denintuzumabmafodotin (Seattle Genetics), B4 (or DI-B4) (Merck Serono), taplitumomabpaptox (National Cancer Institute), XmAb 5871 (Amgen/Xencor, Inc.), MDX-1342 (Medarex) or AFM11 (Affimed). In some instances, the CD19-specific CAR-T cell further comprises a transmembrane domain selected from a CD8alpha transmembrane domain or a CD3ζ transmembrane domain; one or more costimulatory domains selected from CD27, CD28, 4-1BB (CD137), ICOS, DAP10, OX40 (CD134) or fragment or combination thereof; and a signaling domain from CD3ζ.

0230In embodiments, a CAR described herein comprises CD19 specific CAR (CD19-CD8α-CD28-CD3ζ) having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 210. In embodiments, a CAR described herein comprises CD19 specific CAR (CD19-CD8α-CD28-CD3ζ with signal peptide) having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 211.

0231In some embodiments, the antigen binding moiety of a CAR described herein is specific to CD19. The CD19-specific CAR, when expressed on the cell surface, redirects the specificity of T cells to human CD19. In embodiments, the antigen binding domain comprises a single chain antibody fragment (scFv) comprising a variable domain light chain (VL) and variable domain heavy chain (VH) of a target antigen specific monoclonal anti-CD19 antibody joined by a flexible linker, such as a glycine-serine linker or a Whitlow linker. In embodiments, the scFv is anti-CD19 clone FMC63 scFv with whitlow linker (SEQ ID NO 213). In embodiments, the anti-CD19 antibody comprises anti-CD19 monoclonal antibody clone FMC63 variable heavy chain (SEQ ID NO 212). In some embodiments, the antigen binding moiety may comprise VH and VL that are directionally linked, for example, from N to C terminus, VH-linker-VL or VL-linker-VH.

Engineered T Cell Receptor (TCR)

0232In some embodiments, the chimeric receptor encoded by a polynucleotide described herein, comprises an engineered T-cell receptor. The T cell receptor (TCR) is composed of two chains (αβ or γδ) that pair on the surface of the T cell to form a heterodimeric receptor. In some instances, the αβ TCR is expressed on most T cells in the body and is known to be involved in the recognition of specific MHC-restricted antigens. Each α and β chain are composed of two domains: a constant domain (C) which anchors the protein to the cell membrane and is associated with invariant subunits of the CD3 signaling apparatus; and a variable domain (V) that confers antigen recognition through six loops, referred to as complementarity determining regions (CDRs). In some instances, each of the V domains comprises three CDRs; <i>e.g</i>., CDR1, CDR2 and CDR3 with CDR3 as the hypervariable region. These CDRs interact with a complex formed between an antigenic peptide bound to a protein encoded by the major histocompatibility complex (pepMHC) (<i>e.g</i>., HLA-A, HLA-B, HLA-C, HLA-DPA1, HLA-DPB1, HLA-DQA1, HLA-DQB1, HLA-DRA, or HLA-DRB1 complex). In some instances, the constant domain further comprises a joining region that connects the constant domain to the variable domain. In some cases, the beta chain further comprises a short diversity region which makes up part of the joining region.

0233In some cases, such TCR are reactive to specific tumor antigen, <i>e.g</i>. NY-ESO, Mage A3, Titin. In other cases, such TCR are reactive to specific neoantigens expressed within a patient's tumor (<i>i.e.</i> patient-specific, somatic, non-synonymous mutations expressed by tumors). In some cases, engineered TCRs can be affinity-enhanced.

0234In some embodiments, a TCR is described using the International Immunogenetics (IMGT) TCR nomenclature, and links to the IMGT public database of TCR sequences. For example, there can be several types of alpha chain variable (Vα) regions and several types of beta chain variable (Vβ) regions distinguished by their framework, CDR1, CDR2, and CDR3 sequences. As such, a Vα type can be referred to in IMGT nomenclature by a unique TRAV number. For example, "TRAV21" defines a TCR Vα region having unique framework and CDR1 and CDR2 sequences, and a CDR3 sequence which is partly defined by an amino acid sequence which is preserved from TCR to TCR but which also includes an amino acid sequence which varies from TCR to TCR. Similarly, "TRBV5-1" defines a TCR Vβ region having unique framework and CDR1 and CDR2 sequences, but with only a partly defined CDR3 sequence.

0235In some cases, the beta chain diversity region is referred to in IMGT nomenclature by the abbreviation TRBD.

0236In some instances, the unique sequences defined by the IMGT nomenclature are widely known and accessible to those working in the TCR field. For example, they can be found in the IMGT public database and in "<nplcit id="ncit0034" npl-type="b"><text>T cell Receptor Factsbook", (2001) LeFranc and LeFranc, Academic Press, ISBN 0-12-441352-8</text></nplcit>.

0237In some embodiments, an αβ heterodimeric TCR is, for example, transfected as full length chains having both cytoplasmic and transmembrane domains. In some cases, the TCRs contain an introduced disulfide bond between residues of the respective constant domains, as described, for example, in <patcit id="pcit0164" dnum="WO2006000830A"><text>WO 2006/000830</text></patcit>.

0238In some instances, TCRs described herein are in single chain format, for example see <patcit id="pcit0165" dnum="WO2004033685A"><text>WO 2004/033685</text></patcit>. Single chain formats include αβ TCR polypeptides of the Vα-L-Vβ, Vβ-L-Vα, Vα-Cα-L-Vβ, Vα-L-Vβ-Cβ, Vα-Cα-L-Vβ-Cβ types, wherein Vα and Vβ are TCR α and β variable regions respectively, Cα and Cβ are TCR α and β constant regions respectively, and L is a linker sequence. In certain embodiments single chain TCRs of the present disclosure may have an introduced disulfide bond between residues of the respective constant domains, as described in <patcit id="pcit0166" dnum="WO2004033685A"><text>WO 2004/033685</text></patcit>.

0239The TCR described herein may be associated with a detectable label, a therapeutic agent or a PK modifying moiety.

0240Exemplary detectable labels for diagnostic purposes include, but are not limited to, fluorescent labels, radiolabels, enzymes, nucleic acid probes and contrast reagents.

<i>Additional Genetic Elements</i>

0241Although cellular therapies hold great promise for the treatment of human disease, significant toxicities from the cells themselves or from their transgene products have hampered clinical investigation. In embodiments described herein, immune effector cells comprising a CAR or TCR described herein that have been infused into a mammalian subject, <i>e.g</i>., a human, can be ablated in order to regulate the effect of such immune effector cells should toxicity arise from their use. Therefore, certain in embodiments, in addition to the specific chimeric antigen receptor described herein, a second gene is also introduced into an engineered immune effector cell described herein. The second gene is effectively a "kill switch" or "cell tag" that allows for the depletion of CAR or TCR or antigen binding polypeptide containing cells. In certain embodiments, the "kill switch" is a truncated HER1 peptide (herein designated HER1t or EGFRt) which comprises at least an antibody binding epitope of HER1 or functional fragment thereof, and optionally a signal polypeptide sequence or fragment thereof.

0242In certain embodiments, the second gene is a HER1 tag which is Epidermal Growth Factor Receptor (HER1) or a fragment or variant thereof. In embodiments, the second gene is a HER1 tag which is truncated human Epidermal Growth Factor Receptor 1 (for instance HER1t) (SEQ ID NO 76; SEQ ID NO 189). In some cases, the second gene is a variant of a truncated human Epidermal Growth Factor Receptor 1. In some cases, the variant of a truncated HER1 is HER1t1 (SEQ ID NO 77; SEQ ID NO 190), HER1t2 (SEQ ID NO 78; SEQ ID NO 191), HER1t3 (SEQ ID NO 79; SEQ ID NO 192), HER1t4 (SEQ ID NO 80; SEQ ID NO 193), HER115 (SEQ ID NO 81; SEQ ID NO 194), HER1t6 (SEQ ID NO 82; SEQ ID NO 195), HER1t7 (SEQ ID NO 83; SEQ ID NO 196), HER1t8 (SEQ ID NO 84; SEQ ID NO 197), HER119 (SEQ ID NO 85; SEQ ID NO 198), HER1t10 (SEQ ID NO 86; SEQ ID NO 199) or HER1t11(SEQ ID NO 87; SEQ ID NO 200). In embodiments, at least one of HER1, HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 and HER1t11 provide a safety mechanism by allowing for depletion of infused CAR-T cells through administering FDA approved cetuximab or any antibody that recognizes HER1, HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 and/or HER1t11.

0243In embodiments, the HER1t gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 76. In embodiments, the HER1t1 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 77. In embodiments, the HER1t2 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 78. In embodiments, the HER1t3 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 79. In embodiments, the HER1t4 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 80. In embodiments, the HER1t5 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 81. In embodiments, the HER1t6 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 82. In embodiments, the HER1t7 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 83. In embodiments, the HER1t8 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 84. In embodiments, the HER1t9 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 85. In embodiments, the HER1t10 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 86. In embodiments, the HER1t11 gene comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 87.

0244The truncated HER1 sequence, for instance HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 and/or HER1t11 eliminates the potential for EGF ligand binding, homo- and hetero- dimerization of EGFR, and EGFR mediated signaling while keeping cetuximab binding to the receptor intact (<nplcit id="ncit0035" npl-type="s"><text>Ferguson, K., 2008. A structure-based view of Epidermal Growth Factor Receptor regulation. Annu Rev Biophys, Volume 37, pp. 353-373</text></nplcit>).

0245In further embodiments, in addition to the therapeutic target specific chimeric antigen receptor of the present disclosure the second gene introduced is a HER1 tag. In some cases, the HER1 tag is a full-length HER1 polypeptide, or a truncated HER1 polypeptide (HER1t1), HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 or HER1t11. In some cases, the HER1 tag is a truncated HER1 variant. In some cases, the HER1 tag, for instance HER1, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 or HER1t11 also provides a safety mechanism by allowing for depletion of infused CAR-T cells through administering FDA-approved rituximab therapy. In certain embodiments, the HER1 tag has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 189. In certain embodiments, the HER1 tag is a HER1t1 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 190. In certain embodiments, the HER1 tag is a HER1t2 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 191. In certain embodiments, the HER1 tag is a HER 1 t3 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 192. In certain embodiments, the HER1 tag is a HER1t4 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 193. In certain embodiments, the HER1 tag is a HER1t5 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 194. In certain embodiments, the HER1 tag is a HER 1 t6 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 195. In certain embodiments, the HER1 tag is a HER1t7 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 196. In certain embodiments, the HER1 tag is a HER1t8 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 197. In certain embodiments, the HER1 tag is a HER119 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 198. In certain embodiments, the HER1 tag is a HER1t10 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 199. In certain embodiments, the HER1 tag is a HER1t11 tag and has a polypeptide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the sequence of SEQ ID NO: 200.

0246In certain embodiments, the second gene is a CD20 tag (SEQ ID NO 88; SEQ ID NO 201) which is an activated glycosylated phosphoprotein or a fragment or variant thereof. In some cases, the second gene is a variant of a truncated CD20, CD20t1 (SEQ ID NO 89; SEQ ID NO 202). In embodiments, the CD20 tag, the variant of CD20 tag (CD20t1) or the fragment of the CD20 or CD20t1 tag provides a safety mechanism by allowing for depletion of infused CAR-T cells through administering an antibody that recognizes CD20. In embodiments, the gene encoding the CD20 tag comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 88. In embodiments, the gene encoding the CD20t1 tag comprises a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 89.

0247In further embodiments, in addition to the therapeutic target specific chimeric antigen receptor of the present disclosure the second gene introduced is a CD20 tag. In some cases, the CD20 tag is a full-length CD20 polypeptide or a truncated CD20 polypeptide (CD20t1).

0248In embodiments, a CAR vector comprising a CAR described herein further comprises a full length CD20 tag comprising a nucleic acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 88. In embodiments, a CAR vector comprising a CAR described herein further comprises a variant of CD20 tag (CD20t1) comprising a nucleic acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleic acid sequence of SEQ ID NO: 89.

0249In embodiments, the gene encoding the kill tag, for instance the HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 or HER1t11 is genetically fused to the CAR or TCR or cytokine via in-frame with a self-cleaving peptide, for example but not restricted to <i>Thosea asigna</i> virus (T2A) peptide. In embodiments, the T2A peptide has an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO 153. In other embodiments, the gene encoding the kill tag, for instance the HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 or HER1t11 is genetically fused to a cytokine at 3' end via in-frame with a self-cleaving peptide, for example but not restricted to <i>Thosea asigna</i> virus (T2A) peptide.

0250In embodiments, both genes are cloned into a plasmid. In other embodiments, the cell tag is cloned into a separate lentiviral vector. In other embodiments, the cell tag gene is cloned into the Sleeping Beauty transposon vector backbone in frame with the CAR gene. In yet other embodiments, the cell tag such as HER1t, HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10 or HER1t11 is cloned into multiple Sleeping Beauty transposon vectors.

0251In certain embodiments, the cell tags have a signal peptide, for instance, GM-CSFRα signal peptide wherein the GM-CSFRα signal peptide has at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 163. In certain embodiments, the signal peptide is IgK having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 164. In certain embodiments, the signal peptide is IgE having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 165. In certain embodiments, the signal peptide is CD8α having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 166. In certain embodiments, the signal peptide is TVB2 (T21A) having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 167. In certain embodiments, the signal peptide is CD52 having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 168. In certain embodiments, the signal peptide is low-affinity nerve growth factor receptor (LNGFR, TNFRSF16) having a sequence at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the amino acid sequence of SEQ ID NO: 169.In some cases the signal peptide can be selected from GM-CSFRα, IgK, IgE, CD8α, T21A, CD52, low-affinity nerve growth factor receptor variants and fragments thereof.

0252In some embodiments, the cell tags have a signal peptide, for instance, GM-CSFRα signal peptide wherein the GM-CSFRα signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 20 or SEQ ID NO 21. In some embodiments, the cell tags have a signal peptide, for instance, IgK signal peptide wherein the IgK signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 22. In some embodiments, the cell tags have a signal peptide, for instance, IgE signal peptide wherein the IgK signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 23.In some embodiments, the cell tags have a signal peptide, for instance, CD8α signal peptide wherein the CD8α signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 24 or SEQ ID NO 25. In some embodiments, the cell tags have a signal peptide, for instance, TVB2 (T21A) signal peptide wherein the TVB2 (T21A) signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 26. In some embodiments, the cell tags have a signal peptide, for instance, CD52 signal peptide wherein the CD52 signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 27. In some embodiments, the cell tags have a signal peptide, for instance, low-affinity nerve growth factor receptor (LNGFR, TNFRSF 16) signal peptide wherein the low-affinity nerve growth factor receptor (LNGFR, TNFRSF16) signal peptide is encoded from a nucleotide sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identity with the nucleotide acid sequence of SEQ ID NO 28.

0253A signal peptide is a sequence of amino acids typically located at the N-terminus of a newly synthesized protein or polypeptide which directs the protein or polypeptide to the cell surface. In some embodiments, the signal peptide directs the polypeptide to the cell surface to be inserted (<i>e.g</i>., via a transmembrane domain) into the cellular membrane. In some embodiments, a polypeptide construct described herein is synthesized with the signal peptide, but then post-translationally processed to cleave the signal peptide such that the mature polypeptide construct lacks the signal peptide amino acid sequence. In other embodiments, the signal peptide sequence is not cleaved and remains in the mature polypeptide construct.

0254The present disclosure provides for a polypeptide construct comprising any known or unknown signal peptide capable of directing and/or trafficking the polypeptide construct to the cell surface. For example, in some embodiments, a polypeptide construct comprises a signal sequence corresponding to the signal peptide of GMCSFRα, Ig Kappa, Immunoglobulin E, CD8α, TVB2 (T21A), CD52 or Low-affinity nerve growth factor receptor (LNGFR, TNFRSF16).

0255In embodiments, the signal peptide is encoded by a polynucleotide comprising a nucleotide sequence which has at least 70%, 75%, 80%, 85%, 90%, 95%, 99%, or 100% identity with a nucleotide sequence selected from the list consisting of SEQ ID NO: 20-28. In embodiments, the signal peptide comprises an amino acid sequence which has at least 70%, 75%, 80%, 85%, 90%, 95%, 99%, or 100% identity with an amino acid sequence selected from the list consisting of SEQ ID NO: 163-169.

Modified Effector Cells

0256Provided are effector cells (also referred to as immune effector cells) modified to express one or more heterologous genes or genes regulated by gene-switch polypeptides disclosed herein.

0257"T cell" or "T lymphocyte" as used herein is a type of lymphocyte that plays a central role in cell-mediated immunity. They may be distinguished from other lymphocytes, such as B cells and natural killer cells (NK cells), by the presence of a T-cell receptor (TCR) on the cell surface.

0258In some embodiments, modified effector cells are modified immune cells that comprise T cells and/or natural killer cells. T cells or T lymphocytes are a subtype of white blood cells that are involved in cell-mediated immunity. Exemplary T cells include T helper cells, cytotoxic T cells, T_H17 cells, stem memory T cells (TSCM), naive T cells, memory T cells, effector T cells, regulatory T cells, or natural killer T cells.

0259"T helper cells" (T_H cells) assist other white blood cells in immunologic processes, including maturation of B cells into plasma cells and memory B cells, and activation of cytotoxic T cells and macrophages. In some instances, T_H cells are known as CD4+ T cells due to expression of the CD4 glycoprotein on the cell surfaces. Helper T cells become activated when they are presented with peptide antigens by MHC class II molecules, which are expressed on the surface of antigen-presenting cells (APCs). Once activated, they divide rapidly and secrete small proteins called cytokines that regulate or assist in the active immune response. These cells can differentiate into one of several subtypes, including T_H1, T_H2, T_H3, T_H17, T_H9, or T_FH, which secrete different cytokines to facilitate different types of immune responses. Signaling from the APC directs T cells into particular subtypes.

0260"Cytotoxic T cells" (TC cells or CTLs) destroy virus-infected cells and tumor cells, and are also implicated in transplant rejection. These cells are also known as CD8+ T cells since they express the CD8 glycoprotein on their surfaces. These cells recognize their targets by binding to antigen associated with MHC class I molecules, which are present on the surface of all nucleated cells. Through IL-10, adenosine, and other molecules secreted by regulatory T cells, the CD8+ cells can be inactivated to an anergic state, which prevents autoimmune diseases.

0261"Memory T cells" are a subset of antigen-specific T cells that persist long-term after an infection has resolved. They quickly expand to large numbers of effector T cells upon re-exposure to their cognate antigen, thus providing the immune system with "memory" against past infections. Memory T cells comprise subtypes: stem memory T cells (TSCM), central memory T cells (TCM cells) and two types of effector memory T cells (TEM cells and TEMRA cells). Memory cells may be either CD4+ or CD8+. Memory T cells may express the cell surface proteins CD45RO, CD45RA and/or CCR7.

0262"Regulatory T cells" (Treg cells), formerly known as suppressor T cells, play a role in the maintenance of immunological tolerance. Their major role is to shut down T cell-mediated immunity toward the end of an immune reaction and to suppress autoreactive T cells that escaped the process of negative selection in the thymus.

0263"Natural killer T cells" (NKT cells) bridge the adoptive immune system with the innate immune system. Unlike conventional T cells that recognize peptide antigens presented by major histocompatibility complex (MHC) molecules, NKT cells recognize glycolipid antigen presented by a molecule called CD1d. Once activated, these cells can perform functions ascribed to both Th and Tc cells (i.e., cytokine production and release of cytolytic/cell killing molecules). They are also able to recognize and eliminate some tumor cells and cells infected with herpes viruses. Natural killer (NK) cells are a type of cytotoxic lymphocyte of the innate immune system. In some instances, NK cells provide a first line defense against viral infections and/or tumor formation. NK cells can detect MHC presented on infected or cancerous cells, triggering cytokine release, and subsequently induce lysis and apoptosis. NK cells can further detect stressed cells in the absence of antibodies and/or MHC, thereby allowing a rapid immune response.

Modified Effector Cell Doses

0264In some embodiments, an amount of modified effector cells is administered to a subject in need thereof and the amount is determined based on the efficacy and the potential of inducing a cytokine-associated toxicity. In some cases, an amount of modified effector cells comprises about 10⁵ to about 10⁹ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁵ to about 10⁸ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁵ to about 10⁷ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁶ to about 10⁹ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁶ to about 10⁸ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁷ to about 10⁹ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁵ to about 10⁶ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁶ to about 10⁷ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁷ to about 10⁸ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁸ to about 10⁹ modified effector cells/kg. In some instances, an amount of modified effector cells comprises about 10⁹ modified effector cells/kg. In some instances, an amount of modified effector cells comprises about 10⁸ modified effector cells/kg. In some instances, an amount of modified effector cells comprises about 10⁷ modified effector cells/kg. In some instances, an amount of modified effector cells comprises about 10⁶ modified effector cells/kg. In some instances, an amount of modified effector cells comprises about 10⁵ modified effector cells/kg.

0265In some embodiments, the modified effector cells are modified T cells. In some instances, the modified T cells are CAR-T cells. In some cases, an amount of CAR-T cells comprises about 10⁵ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁵ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁵ to about 10⁷ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁶ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁶ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁷ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁵ to about 10⁶ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁶ to about 10⁷ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁷ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CAR-T cells comprises about 10⁸ to about 10⁹ CAR-T cells/kg. In some instances, an amount of CAR-T cells comprises about 10⁹ CAR-T cells/kg. In some instances, an amount of CAR-T cells comprises about 10⁸ CAR-T cells/kg. In some instances, an amount of CAR-T cells comprises about 10⁷ CAR-T cells/kg. In some instances, an amount of CAR-T cells comprises about 10⁶ CAR-T cells/kg. In some instances, an amount of CAR-T cells comprises about 10⁵ CAR-T cells/kg.

0266In some embodiments, the CAR-T cells are CD19-specific CAR-T cells. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁵ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁵ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁵ to about 10⁷ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁶ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁶ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁷ to about 10⁹ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁵ to about 10⁶ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁶ to about 10⁷ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁷ to about 10⁸ CAR-T cells/kg. In some cases, an amount of CD19-specific CAR-T cells comprises about 10⁸ to about 10⁹ CAR-T cells/kg. In some instances, an amount of CD19-specific CAR-T cells comprises about 10⁹ CAR-T cells/kg. In some instances, an amount of CD19-specific CAR-T cells comprises about 10⁸ CAR-T cells/kg. In some instances, an amount of CD19-specific CAR-T cells comprises about 10⁷ CAR-T cells/kg. In some instances, an amount of CD19-specific CAR-T cells comprises about 10⁶ CAR-T cells/kg. In some instances, an amount of CD19-specific CAR-T cells comprises about 10⁵ CAR-T cells/kg.

0267In some embodiments, the modified T cells are engineered TCR T-cells. In some cases, an amount of engineered TCR T- cells comprises about 10⁵ to about 10⁹ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁵ to about 10⁸ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁵ to about 10⁷ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁶ to about 10⁹ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁶ to about 10⁸ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁷ to about 10⁹ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁵ to about 10⁶ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁶ to about 10⁷ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁷ to about 10⁸ TCR cells/kg. In some cases, an amount of engineered TCR cells comprises about 10⁸ to about 10⁹ TCR cells/kg. In some instances, an amount of engineered TCR cells comprises about 10⁹ TCR cells/kg. In some instances, an amount of engineered TCR cells comprises about 10⁸ TCR cells/kg. In some instances, an amount of engineered TCR cells comprises about 10⁷ TCR cells/kg. In some instances, an amount of engineered TCR cells comprises about 10⁶ TCR cells/kg. In some instances, an amount of engineered TCR cells comprises about 10⁵ TCR cells/kg.

Indications

0268In some embodiments, disclosed herein are methods of administering a modified effector cell encoding a polynucleotide described herein to a subject having a disorder, for instance a cancer or an infectious disease. In some cases, the cancer is a cancer associated with an expression of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2.

0269In some embodiments, disclosed herein are methods of administering a polynucleotide, polypeptide or a modified effector cell encoding a polynucleotide described herein, to a subject having a cancer associated with an overexpression of CD19. In some embodiments, disclosed herein are methods of administering a modified effector cell to a subject having a cancer associated with an overexpression of CD33. In some embodiments, disclosed herein are methods of administering a modified effector cell to a subject having a cancer associated with an overexpression of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2. In some cases, the cancer is a metastatic cancer. In other cases, the cancer is a relapsed or refractory cancer.

0270In some cases, a cancer is a solid tumor or a hematologic malignancy. In some instances, the cancer is a solid tumor. In other instances, the cancer is a hematologic malignancy. In some cases, the cancer is a metastatic cancer. In some cases, the cancer is a relapsed or refractory cancer.

0271In some instances, the cancer is a solid tumor. Exemplary solid tumors include, but are not limited to, anal cancer; appendix cancer; bile duct cancer (<i>i.e</i>., cholangiocarcinoma); bladder cancer; brain tumor; breast cancer; cervical cancer; colon cancer; cancer of Unknown Primary (CUP); esophageal cancer; eye cancer; fallopian tube cancer; gastroenterological cancer; kidney cancer; liver cancer; lung cancer; medulloblastoma; melanoma; oral cancer; ovarian cancer; pancreatic cancer; parathyroid disease; penile cancer; pituitary tumor; prostate cancer; rectal cancer; skin cancer; stomach cancer; testicular cancer; throat cancer; thyroid cancer; uterine cancer; vaginal cancer; vulvar cancer; or glioblastoma.

0272"Glioblastoma" or "glioblastoma multiforme" (GBM) is an aggressive neuroepithelial brain cancer. GBM may originate from glial type cells, astrocytes, oligodendrocyte progenitor cells, or neural stem cells. Four subtypes of glioblastoma have been identified. The classical subtype, a majority of GBM, carries extra copies of the <i>epidermal growth factor receptor</i> (<i>EGFR</i>) gene, and most have higher than normal expression of epidermal growth factor receptor (EGFR). In a subset of the cases, EGFR amplification is accompanied by gene rearrangement, the most common of which is EGFR variant III (EGFRvIII). The gene <i>TP53</i> (<i>p53</i>), which is often mutated in glioblastoma, is rarely mutated in the classical subtype. The proneural subtype often has high rates of alterations in <i>TP53</i> (<i>p53</i>), and in <i>PDGFRA</i>, the gene encoding platelet-derived growth factor receptor A, and in <i>IDH1</i>, the gene encoding isocitrate dehydrogenase-1. The Mesenchymal subtype is characterized by high rates of mutations or other alterations in <i>NF1</i>, the gene encoding neurofibromin 1 and fewer alterations in the <i>EGFR</i> gene and less expression of EGFR than other types. The Neural subtype was typified by the expression of neuron markers such as <i>NEFL</i>, <i>GABRA1</i>, <i>SYT1</i> and <i>SLC12A5.</i> Other genetic alterations have been described in glioblastoma, and the majority of them are clustered in two pathways, the RB and the PI3K/AKT. Glioblastomas have alterations in 68-78% and 88% of these pathways, respectively.

0273In some instances, the cancer is a hematologic malignancy. In some cases, a hematologic malignancy comprises a lymphoma, a leukemia, a myeloma, or a B-cell malignancy. In some cases, a hematologic malignancy comprises a lymphoma, a leukemia or a myeloma. In some instances, exemplary hematologic malignancies include chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL), high risk CLL, non-CLL/SLL lymphoma, prolymphocytic leukemia (PLL), follicular lymphoma (FL), diffuse large B-cell lymphoma (DLBCL), mantle cell lymphoma (MCL), Waldenstrom's macroglobulinemia, multiple myeloma, extranodal marginal zone B cell lymphoma, nodal marginal zone B cell lymphoma, Burkitt's lymphoma, non-Burkitt high grade B cell lymphoma, primary mediastinal B-cell lymphoma (PMBL), immunoblastic large cell lymphoma, precursor B-lymphoblastic lymphoma, B cell prolymphocytic leukemia, lymphoplasmacytic lymphoma, splenic marginal zone lymphoma, plasma cell myeloma, plasmacytoma, mediastinal (thymic) large B cell lymphoma, intravascular large B cell lymphoma, primary effusion lymphoma, or lymphomatoid granulomatosis. In some embodiments, the hematologic malignancy comprises a myeloid leukemia. In some embodiments, the hematologic malignancy comprises acute myeloid leukemia (AML) or chronic myeloid leukemia (CML).

0274In some instances, disclosed herein are methods of administering to a subject having a hematologic malignancy selected from chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL), high risk CLL, non-CLL/SLL lymphoma, prolymphocytic leukemia (PLL), follicular lymphoma (FL), diffuse large B-cell lymphoma (DLBCL), mantle cell lymphoma (MCL), Waldenstrom's macroglobulinemia, multiple myeloma, extranodal marginal zone B cell lymphoma, nodal marginal zone B cell lymphoma, Burkitt's lymphoma, non-Burkitt high grade B cell lymphoma, primary mediastinal B-cell lymphoma (PMBL), immunoblastic large cell lymphoma, precursor B-lymphoblastic lymphoma, B cell prolymphocytic leukemia, lymphoplasmacytic lymphoma, splenic marginal zone lymphoma, plasma cell myeloma, plasmacytoma, mediastinal (thymic) large B cell lymphoma, intravascular large B cell lymphoma, primary effusion lymphoma, or lymphomatoid granulomatosis a modified effector cell described herein. In some instances, disclosed herein are methods of administering to a subject having a hematologic malignancy selected from AML or CML a modified effector cell to the subject.

0275In other cases, disclosed herein are methods of administering to a subject having an infection due to an infectious disease. An infectious disease can be a disease resulting from a bacterial, viral or fungi infection. In other instances, exemplary viral pathogens include those of the families of Adenoviridae, Epstein-Barr virus (EBV), Cytomegalovirus (CMV), Respiratory Syncytial Virus (RSV), JC virus, BK virus, HSV, HHV family of viruses, Picornaviridae, Herpesviridae, Hepadnaviridae, Flaviviridae, Retroviridae, Orthomyxoviridae, Paramyxoviridae, Papovaviridae, Polyomavirus, Rhabdoviridae, and Togaviridae. Exemplary pathogenic viruses cause smallpox, influenza, mumps, measles, chickenpox, ebola, and rubella. Exemplary pathogenic fungi include Candida, Aspergillus, Cryptococcus, Histoplasma, Pneumocystis, and Stachybotrys . Exemplary pathogenic bacteria include Streptococcus, Pseudomonas, Shigella, Campylobacter, Staphylococcus, Helicobacter, E. coli, Rickettsia, Bacillus, Bordetella, Chlamydia, Spirochetes, and Salmonella.

Viral Based Delivery System

0276The present disclosure also provides delivery systems, such as viral-based systems, in which a nucleic acid described herein is inserted. Representative viral expression vectors include, but are not limited to, adeno-associated viral vectors, adenovirus-based vectors (<i>e.g</i>., the adenovirus-based Per.C6 system available from Crucell, Inc. (Leiden, The Netherlands)), lentivirus-based vectors (<i>e.g</i>., the lentiviral-based pLPI from Life Technologies (Carlsbad, Calif.)), retroviral vectors (<i>e.g</i>., the pFB-ERV plus pCFB-EGSH), and herpes virus-based vectors. In an embodiment, the viral vector is a lentivirus vector. Vectors derived from retroviruses such as the lentivirus are suitable tools to achieve long-term gene transfer since they allow long-term, stable integration of a transgene and its propagation in daughter cells. Lentiviral vectors have the added advantage over vectors derived from onco-retroviruses such as murine leukemia viruses in that they can transduce non-proliferating cells, such as hepatocytes. They also have the added advantage of low immunogenicity. In an additional embodiment, the viral vector is an adeno-associated viral vector. In a further embodiment, the viral vector is a retroviral vector. In general, and in embodiments, a suitable vector contains an origin of replication functional in at least one organism, a promoter sequence, convenient restriction endonuclease sites, and one or more selectable markers, (<i>e.g</i>., <patcit id="pcit0167" dnum="WO0196584A"><text>WO 01/96584</text></patcit>; <patcit id="pcit0168" dnum="WO0129058A"><text>WO 01/29058</text></patcit>; and <patcit id="pcit0169" dnum="US6326193B"><text>U.S. Pat. No. 6,326,193</text></patcit>).

0277Additional suitable vectors include integrating expression vectors, which may randomly integrate into the host cell's DNA, or may include a recombination site to enable the specific recombination between the expression vector and the host cell's chromosome. Such integrating expression vectors may utilize the endogenous expression control sequences of the host cell's chromosomes to effect expression of the desired protein. Examples of vectors that integrate in a site specific manner include, for example, components of the flp-in system from Invitrogen (Carlsbad, Calif.) (<i>e.g</i>., pcDNATM5/FRT), or the cre-lox system, such as can be found in the pExchange-6 Core Vectors from Stratagene (La Jolla, Calif.). Examples of vectors that randomly integrate into host cell chromosomes include, for example, pcDNA3.1 (when introduced in the absence of T-antigen) from Invitrogen (Carlsbad, Calif.), and pCI or pFN10A (ACT) FLEXITM from Promega (Madison, Wis.). Additional promoter elements, <i>e.g</i>., enhancers, regulate the frequency of transcriptional initiation. Typically, these are located in the region 30-110 bp upstream of the start site, although a number of promoters have recently been shown to contain functional elements downstream of the start site as well. The spacing between promoter elements frequently is flexible, so that promoter function is preserved when elements are inverted or moved relative to one another. In the thymidine kinase (tk) promoter, the spacing between promoter elements can be increased to 50 bp apart before activity begins to decline. Depending on the promoter, it appears that individual elements can function either cooperatively or independently to activate transcription.

0278One example of a suitable promoter is the immediate early cytomegalovirus (CMV) promoter sequence. This promoter sequence is a strong constitutive promoter sequence capable of driving high levels of expression of any polynucleotide sequence operatively linked thereto.

0279Another example of a suitable promoter is human elongation growth factor 1 alpha 1 (hEF1a1). In embodiments, the vector construct comprising the CARs and/or TCRs of the present disclosure comprises hEF1a1 functional variants.

0280However, other constitutive promoter sequences may also be used, including, but not limited to the simian virus 40 (SV40) early promoter, mouse mammary tumor virus (MMTV), human immunodeficiency virus (HIV) long terminal repeat (LTR) promoter, MoMuLV promoter, an avian leukemia virus promoter, an Epstein-Barr virus immediate early promoter, a Rous sarcoma virus promoter, as well as human gene promoters such as, but not limited to, the actin promoter, the myosin promoter, the hemoglobin promoter, and the creatine kinase promoter. Further, the present disclosure should not be limited to the use of constitutive promoters. Inducible promoters are also contemplated as part of the present disclosure. The use of an inducible promoter provides a molecular switch capable of turning on expression of the polynucleotide sequence which it is operatively linked when such expression is desired, or turning off the expression when expression is not desired. Examples of inducible promoters include, but are not limited to a metallothionine promoter, a glucocorticoid promoter, a progesterone promoter, and a tetracycline promoter. Other examples of inducible promoters include, but are not limited to tissue specific promoters as described herein. In some embodiments, the promoter comprises NF-κB binding site (SEQ ID NOS 44-46), nuclear factor of activated T cells (NFAT) response element (SEQ ID NO 51), 6 site GAL4-inducible proximal factor binding element (PFB) (SEQ ID NO 62) or synthetic 5' UTR based on RPL6 (SEQ ID NO 64). In certain embodiments, the promoter can be any one or more of: IL-2 core promoter, IL-2 minimal promoter, IL-2 enhancer and promoter variant, (NF-κB)₁-IL2 promoter variant, (NF-κB)₃-IL2 promoter variant, (NF-κB)₆-IL2 promoter variant, 1X NFAT response elements-IL2 promoter variant, 3X NFAT response elements-IL2 promoter variant, 6X NFAT response elements-IL2 promoter variant, human EEF1A1 promoter variant, human EEF1A1 promoter and enhancer, human UBC promoter and synthetic minimal promoter 1. In certain embodiments, the promoter nucleotides comprise disclosed in <b>Table 2.</b>

0281In order to assess the expression of a CAR or TCR polypeptide or portions thereof, the expression vector to be introduced into a cell can also contain either a selectable marker gene or a reporter gene or both to facilitate identification and selection of expressing cells from the population of cells sought to be transfected or infected through viral vectors. In other aspects, the selectable marker may be carried on a separate piece of DNA and used in a co-transfection procedure. Both selectable markers and reporter genes may be flanked with appropriate regulatory sequences to enable expression in the host cells. Useful selectable markers include, for example, antibiotic-resistance genes, such as neomycin resistance gene (neo) and ampicillin resistance gene and the like. In some embodiments, a truncated epidermal growth factor receptor (HER1t) tag may be used as a selectable marker gene.

0282Reporter genes can be used for identifying potentially transfected cells and for evaluating the functionality of regulatory sequences. In general, a reporter gene is a gene that is not present in or expressed by the recipient organism or tissue and that encodes a polypeptide whose expression is manifested by some easily detectable property, <i>e.g</i>., enzymatic activity. Expression of the reporter gene is assayed at a suitable time after the DNA has been introduced into the recipient cells. Suitable reporter genes may include genes encoding luciferase, beta-galactosidase, chloramphenicol acetyl transferase, secreted alkaline phosphatase, or the green fluorescent protein gene (<i>e.g.,</i><nplcit id="ncit0036" npl-type="s"><text>Ui-Tei et al., FEBS Letters 479: 79-82 (2000</text></nplcit>)). Suitable expression systems are well known and may be prepared using known techniques or obtained commercially. In general, the construct with the minimal 5' flanking region showing the highest level of expression of reporter gene is identified as the promoter. Such promoter regions may be linked to a reporter gene and used to evaluate agents for the ability to modulate promoter-driven transcription.

0283In some embodiments, the vectors comprise a hEF1a1 promoter to drive expression of transgenes, a bovine growth hormone polyA sequence to enhance transcription, a woodchuck hepatitis virus posttranscriptional regulatory element (WPRE), as well as LTR sequences derived from the pFUGW plasmid.

0284Methods of introducing and expressing genes into a cell are known in the art. In the context of an expression vector, the vector can be readily introduced into a host cell, <i>e.g.,</i> mammalian, bacterial, yeast, or insect cell by any method in the art. For example, the expression vector can be transferred into a host cell by physical, chemical, or biological means.

0285Physical methods for introducing a polynucleotide into a host cell include calcium phosphate precipitation, lipofection, particle bombardment, microinjection, electroporation, and the like. Methods for producing cells comprising vectors and/or exogenous nucleic acids are well-known in the art. See, for example, <nplcit id="ncit0037" npl-type="b"><text>Sambrook et al. (Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, New York (2001</text></nplcit>)). In embodiments, a method for the introduction of a polynucleotide into a host cell is calcium phosphate transfection or polyethylenimine (PEI) Transfection.

0286Biological methods for introducing a polynucleotide of interest into a host cell include the use of DNA and RNA vectors. Viral vectors, and especially retroviral vectors, have become the most widely used method for inserting genes into mammalian, <i>e.g</i>., human cells. Other viral vectors can be derived from lentivirus, poxviruses, herpes simplex virus I, adenoviruses and adeno-associated viruses, and the like. See, for example, <patcit id="pcit0170" dnum="US5350674A"><text>U.S. Pat. Nos. 5,350,674</text></patcit> and <patcit id="pcit0171" dnum="US5585362A"><text>5,585,362</text></patcit>.

0287Chemical means for introducing a polynucleotide into a host cell include colloidal dispersion systems, such as macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes. An exemplary colloidal system for use as a delivery vehicle <i>in vitro</i> and <i>in vivo</i> is a liposome (<i>e.g</i>., an artificial membrane vesicle).

0288In the case where a viral delivery system is utilized, an exemplary delivery vehicle is a liposome. The use of lipid formulations is contemplated for the introduction of the nucleic acids into a host cell (<i>in vitro, ex vivo</i> or <i>in vivo</i>)<i>.</i> In another aspect, the nucleic acid may be associated with a lipid. The nucleic acid associated with a lipid may be encapsulated in the aqueous interior of a liposome, interspersed within the lipid bilayer of a liposome, attached to a liposome via a linking molecule that is associated with both the liposome and the oligonucleotide, entrapped in a liposome, complexed with a liposome, dispersed in a solution containing a lipid, mixed with a lipid, combined with a lipid, contained as a suspension in a lipid, contained or complexed with a micelle, or otherwise associated with a lipid. Lipid, lipid/DNA or lipid/expression vector associated compositions are not limited to any particular structure in solution. For example, they may be present in a bilayer structure, as micelles, or with a "collapsed" structure. They may also simply be interspersed in a solution, possibly forming aggregates that are not uniform in size or shape. Lipids are fatty substances which may be naturally occurring or synthetic lipids. For example, lipids include the fatty droplets that naturally occur in the cytoplasm as well as the class of compounds which contain long-chain aliphatic hydrocarbons and their derivatives, such as fatty acids, alcohols, amines, amino alcohols, and aldehydes.

0289Lipids suitable for use can be obtained from commercial sources. For example, dimyristyl phosphatidylcholine ("DMPC") can be obtained from Sigma, St. Louis, Mo.; dicetyl phosphate ("DCP") can be obtained from K &amp; K Laboratories (Plainview, N.Y.); cholesterol ("Choi") can be obtained from Calbiochem-Behring; dimyristyl phosphatidylglycerol ("DMPG") and other lipids may be obtained from Avanti Polar Lipids, Inc. (Birmingham, Ala.). Stock solutions of lipids in chloroform or chloroform/methanol can be stored at about -20o C. Chloroform is used as the only solvent since it is more readily evaporated than methanol. "Liposome" is a generic term encompassing a variety of single and multilamellar lipid vehicles formed by the generation of enclosed lipid bilayers or aggregates. Liposomes can be characterized as having vesicular structures with a phospholipid bilayer membrane and an inner aqueous medium. Multilamellar liposomes have multiple lipid layers separated by aqueous medium. They form spontaneously when phospholipids are suspended in an excess of aqueous solution. The lipid components undergo self-rearrangement before the formation of closed structures and entrap water and dissolved solutes between the lipid bilayers (<nplcit id="ncit0038" npl-type="s"><text>Ghosh et al., Glycobiology 5: 505-10 (1991</text></nplcit>)). However, compositions that have different structures in solution than the normal vesicular structure are also encompassed. For example, the lipids may assume a micellar structure or merely exist as nonuniform aggregates of lipid molecules. Also contemplated are lipofectamine-nucleic acid complexes.

Non-Viral Based Delivery System

0290In some instances, polynucleotides encoding gene-switch polypeptides for expressing CARs and/or TCRs described herein can also be introduced into T cells using non-viral based delivery systems, such as the "Sleeping Beauty (SB) Transposon System," which refers a synthetic DNA transposon system for introducing DNA sequences into the chromosomes of vertebrates. Some exemplary embodiments of the system are described, for example, in <patcit id="pcit0172" dnum="US6489458B"><text>U.S. Pat. Nos. 6,489,458</text></patcit>, <patcit id="pcit0173" dnum="US8227432B"><text>8,227,432</text></patcit>, <patcit id="pcit0174" dnum="US9228180B"><text>9,228,180</text></patcit> and <patcit id="pcit0175" dnum="WO2016145146A"><text>WO2016/145146</text></patcit>. The Sleeping Beauty transposon system is composed of a Sleeping Beauty (SB) transposase and a SB transposon. In embodiments, the Sleeping Beauty transposon system can include the SB11 transposon system, the SB100X transposon system, or the SB110 transposon system and any other variants thereof.

0291DNA transposons translocate from one DNA site to another in a simple, cut-and-paste manner. Transposition is a precise process in which a defined DNA segment is excised from one DNA molecule and moved to another site in the same or different DNA molecule or genome. As do other Tc1/mariner-type transposases, SB transposase inserts a transposon into a TA dinucleotide base pair in a recipient DNA sequence. The insertion site can be elsewhere in the same DNA molecule, or in another DNA molecule (or chromosome). In mammalian genomes, including humans, there are approximately 200 million TA sites. The TA insertion site is duplicated in the process of transposon integration. This duplication of the TA sequence is a hallmark of transposition and used to ascertain the mechanism in some experiments. The transposase can be encoded either within the transposon or the transposase can be supplied by another source, for instance a DNA or mRNA source, in which case the transposon becomes a non-autonomous element. Non-autonomous transposons are most useful as genetic tools because after insertion they cannot independently continue to excise and re-insert. SB transposons envisaged to be used as non-viral vectors for introduction of genes into genomes of vertebrate animals and for gene therapy. Briefly, the Sleeping Beauty (SB) system (<nplcit id="ncit0039" npl-type="s"><text>Hackett et al., Mol Ther 18:674-83, (2010</text></nplcit>)) was adapted to genetically modify the T cells (<nplcit id="ncit0040" npl-type="s"><text>Cooper et al., Blood 105:1622-31, (2005</text></nplcit>)). This involved two steps: (i) the electro-transfer of DNA plasmids expressing a SB transposon [<i>i.e</i>., chimeric antigen receptor (CAR) to redirect T-cell specificity (<nplcit id="ncit0041" npl-type="s"><text>Jin et al., Gene Ther 18:849-56, (2011</text></nplcit>); <nplcit id="ncit0042" npl-type="s"><text>Kebriaei et al., Hum Gene Ther 23:444-50, (2012</text></nplcit>)) and SB transposase and (ii) the propagation and expansion of T cells stably expressing integrants on designer artificial antigen-presenting cells (AaPC) derived from the K562 cell line (also known as AaPCs (Activating and Propagating Cells). In one embodiment, the SB transposon system includes coding sequence encoding tdIL-15, an IL-21 and/or a chimeric antigen receptor. Such systems are described for example in <nplcit id="ncit0043" npl-type="s"><text>Singh et al., Cancer Res (8):68 (2008). April 15, 2008</text></nplcit> and <nplcit id="ncit0044" npl-type="s"><text>Maiti et al., J Immunother. 36(2): 112-123 (2013</text></nplcit>), incorporated herein by reference in their entireties.

0292In some embodiments, a polynucleotide encoding a CAR or a TCR, one or more gene-switch polypeptides and mbIL-15 is encoded in one or more Sleeping Beauty transposon(s), and the SB transposase is encoded in a separate vector. In embodiments, the CD19 specific CAR is encoded in a transposon DNA plasmid vector, mb-IL15 is encoded in a second transposon DNA plasmid vector, and the SB transposase is encoded in a third DNA plasmid vector. In some embodiments, the mbIL-15 is encoded with a cell tag. Examples of cell tags can include truncated epidermal growth factor receptor tag (HER1t), HER1t1, HER1t2, HER1t3, HER1t4, HER1t5, HER1t6, HER1t7, HER1t8, HER1t9, HER1t10, HER1t11, CD20 and CD20t1. CD20 tag or any other appropriate cell tags for use as a depletion or kill switch, or enrichment marker. Non-limiting exemplary gene switch vector system comprising a cell tag is illustrated in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>, <figref idref="f0006">FIG. 3</figref>,<figref idref="f0029 f0030">FIG. 19A-19B</figref>, <figref idref="f0031">FIG. 20A</figref>, <figref idref="f0038">FIG. 22</figref>, <figref idref="f0040 f0041 f0042 f0043">FIG. 24A-24D</figref>, and <figref idref="f0044 f0045">FIG. 25A-25B</figref>.

0293In some embodiments, HER1t provides a safety mechanism by allowing for depletion of infused CAR-T cells through administering FDA approved cetuximab or any antibody that recognizes HER1t. In some embodiments, CD20 also provides a safety mechanism by allowing for depletion of infused CAR-T cells through administering FDA-approved rituximab therapy.

0294Regardless of the method used to introduce exogenous nucleic acids into a host cell or otherwise expose a cell to the inhibitor of the present disclosure, in order to confirm the presence of the recombinant DNA sequence in the host cell, a variety of assays may be performed. Such assays include, for example, molecular assays well known to those of skill in the art, such as Southern and Northern blotting, RT-PCR and PCR; "biochemical" assays, such as detecting the presence or absence of a particular peptide, <i>e.g</i>., by immunological means (ELISAs and Western blots) or by assays described herein to identify agents falling within the scope of the present disclosure. In embodiments, a modified effector cell described herein and other genetic elements are delivered to a cell using the SB11 transposon system, the SB100X transposon system, the SB110 transposon system, the piggyBac transposon system (see, <i>e.g</i>., <nplcit id="ncit0045" npl-type="s"><text>Wilson et al, "PiggyBac Transposon-mediated Gene Transfer in Human Cells," Molecular Therapy 15:139-145 (2007</text></nplcit>), incorporated herein by reference in its entirety) and/or the piggyBac transposon system (see, <i>e.g</i>., <nplcit id="ncit0046" npl-type="s"><text>Mitra et al., "Functional characterization of piggyBac from the bat Myotis lucifugus unveils an active mammalian DNA transposon," Proc. Natl. Acad. Sci USA 110:234-239 (2013</text></nplcit>). Additional transposases and transposon systems are provided in <patcit id="pcit0176" dnum="US6489458B"><text>U.S. Patent Nos.; 6,489,458</text></patcit>; <patcit id="pcit0177" dnum="US6613752B"><text>6,613,752</text></patcit>, <patcit id="pcit0178" dnum="US7148203B"><text>7,148,203</text></patcit>; <patcit id="pcit0179" dnum="US7985739B"><text>7,985,739</text></patcit>; <patcit id="pcit0180" dnum="US8227432B"><text>8,227,432</text></patcit>; <patcit id="pcit0181" dnum="US9228180B"><text>9,228,180</text></patcit>; <patcit id="pcit0182" dnum="US20110117072A"><text>U.S. Patent Publn. No. 2011/0117072</text></patcit>; <nplcit id="ncit0047" npl-type="s"><text>Mates et al., Nat Genet, 41(6):753-61 (2009). doi: 10.1038/ng.343. Epub 2009 May 3</text></nplcit>, <nplcit id="ncit0048" npl-type="s"><text>Gene Ther., 18(9):849-56 (2011). doi: 10.1038/gt.2011.40. Epub 2011 Mar 31</text></nplcit> and in <nplcit id="ncit0049" npl-type="s"><text>Ivics et al., Cell. 91(4):501-10, (1997</text></nplcit>), each of which is incorporated herein by reference in their entirety.

0295Additional suitable non-viral systems can include integrating expression vectors, which may randomly integrate into the host cell's DNA, or may include a recombination site to enable the specific recombination between the expression vector and the host cell's chromosome. Targeted integration of transgenes into predefined genetic loci is a desirable goal for many applications. First, a first recombination site for a site-specific recombinase is inserted at a genomic site, either at a random or at a predetermined location. Subsequently, the cells are transfected with a plasmid carrying the gene or DNA of interest and the second recombination site and a source for recombinase (expression plasmid, RNA, protein, or virus-expressing recombinase). Recombination between the first and second recombination sites leads to integration of plasmid DNA.

0296Such integrating expression vectors may utilize the endogenous expression control sequences of the host cell's chromosomes to effect expression of the desired protein. In some embodiments, targeted integration is promoted by the presence of sequences on the donor polynucleotide that are homologous to sequences flanking the integration site. For example, targeted integration using the donor polynucleotides described herein may be achieved following conventional transfection techniques, <i>e.g</i>. techniques used to create gene knockouts or knockins by homologous recombination. In other embodiments, targeted integration is promoted both by the presence of sequences on the donor polynucleotide that are homologous to sequences flanking the integration site, and by contacting the cells with donor polynucleotide in the presence of a site-specific recombinase. By a site-specific recombinase, or simply a recombinase, it is meant is a polypeptide that catalyzes conservative site-specific recombination between its compatible recombination sites. As used herein, a site-specific recombinase includes native polypeptides as well as derivatives, variants and/or fragments that retain activity, and native polynucleotides, derivatives, variants, and/or fragments that encode a recombinase that retains activity.

0297Also provided herein is a system for integrating heterologous genes in a host cell, said system comprising one or more gene expression cassettes. In some instances, the system includes a first gene expression cassette comprising a first polynucleotide encoding a first polypeptide construct. In other instances, the system can include a second gene expression cassette comprising a second polynucleotide encoding a second polypeptide construct. In yet other instances, the system can include a third gene expression cassette. In one embodiment, one of the gene expression cassettes can comprise a gene switch polynucleotide encoding one or more of: (i) a transactivation domain; (ii) nuclear receptor ligand binding domain; (iii) a DNA-binding domain; and (iv) ecdysone receptor binding domain. In another embodiment, the system further includes recombinant attachment sites; and a serine recombinase; such that upon contacting said host cell with at least said first gene expression cassette, in the presence of said serine recombinase, said heterologous genes are integrated in said host cell.

0298In some instances, the system further comprises a ligand; such that upon contacting said host cell, in the presence of said ligand, said heterologous gene are expressed in said host cell. In one instance, the system also includes recombinant attachment sites. In some instances, one recombination attachment site is a phage genomic recombination attachment site (attP) or a bacterial genomic recombination attachment site (attB). In one instance, the host cell is an eukaryotic cell. In another instance, the host cell is a human cell. In further instances, the host cell is a T cell or NK cell.

0299In one embodiment, the heterologous gene in the system described above comprises a CAR. In some embodiments, the CAR binds at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 or VEGF-R2.

0300In another embodiment, the system includes a heterologous gene comprising a cytokine. In one instance, the cytokine comprises at least one of IL-15, IL-12, IL-21, and a fusion of IL-15 and IL-15Rα. In one embodiment, the system includes a heterologous gene comprising at least one cell tag. In one instance, said cell tag comprises at least one of HER1t and CD20. In some embodiments, the mbIL-15 is encoded with a cell tag. Examples of cell tags can include truncated epidermal growth factor receptor tag (HER1t), CD20 tag or any other appropriate cell tags for use as a depletion or kill switch, or enrichment marker. Exemplary sequences of cell tags are as below: <tables id="tabl0003" num="0003"><table frame="all"><title><b>Table 3</b>. Cell tag amino acid sequences and polynucleotide sequences</title><tgroup cols="5"><colspec colnum="1" colname="col1" colwidth="19mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="66mm" /><colspec colnum="4" colname="col4" colwidth="11mm" /><colspec colnum="5" colname="col5" colwidth="61mm" /><thead valign="middle"><row><entry><b>Cell Tag Name</b></entry><entry align="center"><b>SEQ ID NO</b></entry><entry><b>Polynucleotide Sequence (5' to 3' where applicable)</b></entry><entry align="center"><b>SEQ ID NO</b></entry><entry><b>Amino Acid Sequence (5' to 3' where applicable)</b></entry></row></thead><tbody valign="middle"><row><entry>Truncated EGFR (huEGFRt) (Her1t)</entry><entry align="center">76</entry><entry><img file="EP4382913A2_D0044.tif" /></entry><entry align="center">189</entry><entry><img file="EP4382913A2_D0045.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0046.tif" /></entry><entry align="center" /><entry /></row><row><entry>EGFR truncated design 1 (Her1 truncated design 1) (HER1t1)</entry><entry align="center">77</entry><entry><img file="EP4382913A2_D0047.tif" /></entry><entry align="center">190</entry><entry><img file="EP4382913A2_D0048.tif" /></entry></row><row><entry>EGFR truncated design 2 (Her1</entry><entry align="center">78</entry><entry><img file="EP4382913A2_D0049.tif" /></entry><entry align="center">191</entry><entry><img file="EP4382913A2_D0050.tif" /></entry></row><row><entry>truncated design 2) (HER1t2)</entry><entry align="center" /><entry><img file="EP4382913A2_D0051.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0052.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 3 (Her1 truncated design 3) (HER1t3)</entry><entry align="center">79</entry><entry><img file="EP4382913A2_D0053.tif" /></entry><entry align="center">192</entry><entry><img file="EP4382913A2_D0054.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0055.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0056.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 4 (Her1 truncated design 4) (HER1t4)</entry><entry align="center">80</entry><entry><img file="EP4382913A2_D0057.tif" /></entry><entry align="center">193</entry><entry><img file="EP4382913A2_D0058.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0059.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0060.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 5 (Her1 truncated design 5) (HER1t5)</entry><entry align="center">81</entry><entry><img file="EP4382913A2_D0061.tif" /></entry><entry align="center">194</entry><entry><img file="EP4382913A2_D0062.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0063.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0064.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 6 (Her1 truncated design 6) (HER1t6)</entry><entry align="center">82</entry><entry><img file="EP4382913A2_D0065.tif" /></entry><entry align="center">195</entry><entry><img file="EP4382913A2_D0066.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0067.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0068.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 7 (Her1 truncated design 7) (HER1t7)</entry><entry align="center">83</entry><entry><img file="EP4382913A2_D0069.tif" /></entry><entry align="center">196</entry><entry><img file="EP4382913A2_D0070.tif" /></entry></row><row rowsep="0"><entry /><entry /><entry><img file="EP4382913A2_D0071.tif" /></entry><entry /><entry><img file="EP4382913A2_D0072.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0073.tif" /></entry><entry align="center" /><entry /></row><row><entry>EGFR truncated design 8 (Her1 truncated design 8) (HER1t8)</entry><entry align="center">84</entry><entry><img file="EP4382913A2_D0074.tif" /></entry><entry align="center">197</entry><entry><img file="EP4382913A2_D0075.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 9 (Her1 truncated design 9) (HER1t9)</entry><entry align="center">85</entry><entry><img file="EP4382913A2_D0076.tif" /></entry><entry align="center">198</entry><entry><img file="EP4382913A2_D0077.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0078.tif" /></entry><entry align="center" /><entry><img file="EP4382913A2_D0079.tif" /></entry></row><row rowsep="0"><entry>EGFR truncated design 10 (Her1 truncated design 10) (HER1t10)</entry><entry align="center">86</entry><entry><img file="EP4382913A2_D0080.tif" /></entry><entry align="center">199</entry><entry><img file="EP4382913A2_D0081.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0082.tif" /></entry><entry align="center" /><entry /></row><row rowsep="0"><entry>EGFR truncated design 11 (Her1 truncated design 11) (HER1t11)</entry><entry align="center">87</entry><entry><img file="EP4382913A2_D0083.tif" /></entry><entry align="center">200</entry><entry><img file="EP4382913A2_D0084.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0085.tif" /></entry><entry align="center" /><entry /></row><row rowsep="0"><entry>FL CD20</entry><entry align="center">88</entry><entry><img file="EP4382913A2_D0086.tif" /></entry><entry align="center">201</entry><entry><img file="EP4382913A2_D0087.tif" /></entry></row><row><entry /><entry align="center" /><entry><img file="EP4382913A2_D0088.tif" /></entry><entry align="center" /><entry /></row><row rowsep="0"><entry>Truncated CD20 design 1 (CD20t1) [CD20(M1-E263]</entry><entry align="center">89</entry><entry><img file="EP4382913A2_D0089.tif" /></entry><entry align="center">202</entry><entry><img file="EP4382913A2_D0090.tif" /></entry></row><row><entry /><entry /><entry><img file="EP4382913A2_D0091.tif" /></entry><entry /><entry /></row></tbody></tgroup></table></tables>

0301In further embodiments, at least one of said gene expression cassettes comprises a polynucleotide encoding a promoter that is activated by the transactivation domain. In further embodiments, said system is contained in one or more vectors. In one instance, the system is contained in one vector. In one instance, the first gene expression cassette, the second gene expression cassette, and the recombinant attachment sites are contained in one vector. In one instance, the first gene expression cassette, the second gene expression cassette, the third gene expression cassette and the recombinant attachment sites are contained in one vector. In another instance, the serine recombinase is SF370. In other instances, the serine recombinase is in a separate vector.

0302The recombinases can be introduced into a target cell before, concurrently with, or after the introduction of a targeting vector. The recombinase can be directly introduced into a cell as a protein, for example, using liposomes, coated particles, or microinjection. Alternately, a polynucleotide, either DNA or messenger RNA, encoding the recombinase can be introduced into the cell using a suitable expression vector. The targeting vector components described above are useful in the construction of expression cassettes containing sequences encoding a recombinase of interest. However, expression of the recombinase can be regulated in other ways, for example, by placing the expression of the recombinase under the control of a regulatable promoter (<i>i.e.,</i> a promoter whose expression can be selectively induced or repressed).

0303Recombinases for use in the practice of the present disclosure can be produced recombinantly or purified as previously described. Polypeptides having the desired recombinase activity can be purified to a desired degree of purity by methods known in the art of protein ammonium sulfate precipitation, purification, including, but not limited to, size fractionation, affinity chromatography, HPLC, ion exchange chromatography, heparin agarose affinity chromatography (<i>e.g</i>., <nplcit id="ncit0050" npl-type="s"><text>Thorpe &amp; Smith, Proc. Nat. Acad. Sci. 95:5505-5510, 1998</text></nplcit>.)

0304In one embodiment, the recombinases can be introduced into the eukaryotic cells that contain the recombination attachment sites at which recombination is desired by any suitable method. Methods of introducing functional proteins, e.g., by microinjection or other methods, into cells are well known in the art. Introduction of purified recombinase protein ensures a transient presence of the protein and its function, which is often a preferred embodiment. Alternatively, a gene encoding the recombinase can be included in an expression vector used to transform the cell, in which the recombinase-encoding polynucleotide is operably linked to a promoter which mediates expression of the polynucleotide in the eukaryotic cell. The recombinase polypeptide can also be introduced into the eukaryotic cell by messenger RNA that encodes the recombinase polypeptide. It is generally preferred that the recombinase be present for only such time as is necessary for insertion of the nucleic acid fragments into the genome being modified. Thus, the lack of permanence associated with most expression vectors is not expected to be detrimental. One can introduce the recombinase gene into the cell before, after, or simultaneously with, the introduction of the exogenous polynucleotide of interest. In one embodiment, the recombinase gene is present within the vector that carries the polynucleotide that is to be inserted; the recombinase gene can even be included within the polynucleotide. In other embodiments, the recombinase gene is introduced into a transgenic eukaryotic organism. Transgenic cells or animals can be made that express a recombinase constitutively or under cell-specific, tissue-specific, developmental-specific, organelle-specific, or small molecule-inducible or repressible promoters. The recombinases can be also expressed as a fusion protein with other peptides, proteins, nuclear localizing signal peptides, signal peptides, or organelle-specific signal peptides (<i>e.g</i>., mitochondrial or chloroplast transit peptides to facilitate recombination in mitochondria or chloroplast).

0305For example, a recombinase may be from the Integrase or Resolvase families. The Integrase family of recombinases has over one hundred members and includes, for example, FLP, Cre, and lambda integrase. The Integrase family, also referred to as the tyrosine family or the lambda integrase family, uses the catalytic tyrosine's hydroxyl group for a nucleophilic attack on the phosphodiester bond of the DNA. Typically, members of the tyrosine family initially nick the DNA, which later forms a double strand break. Examples of tyrosine family integrases include Cre, FLP, SSV1, and lambda (λ) integrase. In the resolvase family, also known as the serine recombinase family, a conserved serine residue forms a covalent link to the DNA target site (<nplcit id="ncit0051" npl-type="s"><text>Grindley, et al., (2006) Ann Rev Biochem 16:16</text></nplcit>).

0306In one embodiment, the recombinase is an isolated polynucleotide sequence comprising a nucleic acid sequence that encodes a recombinase selecting from the group consisting of a SPβc2 recombinase, a SF370.1 recombinase, a Bxb1 recombinase, an A118 recombinase and a φRv1 recombinase. Examples of serine recombinases are described in detail in <patcit id="pcit0183" dnum="US9034652B"><text>U.S. Patent No. 9,034,652</text></patcit>, hereby incorporated by reference in its entirety.

0307In one embodiment, a method for site-specific recombination comprises providing a first recombination site and a second recombination site; contacting the first and second recombination sites with a prokaryotic recombinase polypeptide, resulting in recombination between the recombination sites, wherein the recombinase polypeptide can mediate recombination between the first and second recombination sites, the first recombination site is attP or attB, the second recombination site is attB or attP, and the recombinase is selected from the group consisting of a <i>Listeria monocytogenes</i> phage recombinase, a <i>Streptococcus pyogenes</i> phage recombinase, a <i>Bacillus subtilis</i> phage recombinase, a <i>Mycobacterium tuberculosis</i> phage recombinase and a <i>Mycobacterium smegmatis</i> phage recombinase, provided that when the first recombination attachment site is attB, the second recombination attachment site is attP, and when the first recombination attachment site is attP, the second recombination attachment site is attB Further embodiments provide for the introduction of a site-specific recombinase into a cell whose genome is to be modified. One embodiment relates to a method for obtaining site-specific recombination in an eukaryotic cell comprises providing a eukaryotic cell that comprises a first recombination attachment site and a second recombination attachment site; contacting the first and second recombination attachment sites with a prokaryotic recombinase polypeptide, resulting in recombination between the recombination attachment sites, wherein the recombinase polypeptide can mediate recombination between the first and second recombination attachment sites, the first recombination attachment site is a phage genomic recombination attachment site (attP) or a bacterial genomic recombination attachment site (attB), the second recombination attachment site is attB or attP, and the recombinase is selected from the group consisting of a <i>Listeria monocytogenes</i> phage recombinase, <i>a Streptococcus pyogenes</i> phage recombinase, a <i>Bacillus subtilis</i> phage recombinase, a <i>Mycobacterium tuberculosis</i> phage recombinase and a <i>Mycobacterium smegmatis</i> phage recombinase, provided that when the first recombination attachment site is attB, the second recombination attachment site is attP, and when the first recombination attachment site is attP, the second recombination attachment site is attB. In an embodiment the recombinase is selected from the group consisting of an A118 recombinase, a SF370.1 recombinase, a SPβc2 recombinase, a φRv1 recombinase, and a Bxb1 recombinase. In one embodiment the recombination results in integration.

Immune Effector Cell Sources

0308In certain aspects, the embodiments described herein include methods of making and/or expanding the antigen-specific redirected immune effector cells (<i>e.g</i>., T-cells, NK-cell or NK T-cells) that comprises transfecting the cells with an expression vector containing a DNA (or RNA) construct encoding the CAR, then, optionally, stimulating the cells with feeder cells, recombinant antigen, or an antibody to the receptor to cause the cells to proliferate. In certain aspects, the cell (or cell population) engineered to express a CAR or TCR is a stem cell, iPS cell, immune effector cell or a precursor of these cells.

0309Sources of immune effector cells can include both allogeneic and autologous sources. In some cases immune effector cells may be differentiated from stem cells or induced pluripotent stem cells (iPSCs). Thus, cells for engineering according to the embodiments can be isolated from umbilical cord blood, peripheral blood, human embryonic stem cells, or iPSCs. For example, allogeneic T cells can be modified to include a chimeric antigen receptor (and optionally, to lack functional TCR). In some aspects, the immune effector cells are primary human T cells such as T cells derived from human peripheral blood mononuclear cells (PBMC). PBMCs can be collected from the peripheral blood or after stimulation with G-CSF (Granulocyte colony stimulating factor) from the bone marrow, or umbilical cord blood. Following transfection or transduction (<i>e.g</i>., with a CAR expression construct), the cells may be immediately infused or may be cryo-preserved. In certain aspects, following transfection, the cells may be propagated for days, weeks, or months <i>ex vivo</i> as a bulk population within about 1, 2, 3, 4, 5 days or more following gene transfer into cells. In a further aspect, following transfection, the transfectants are cloned and a clone demonstrating presence of a single integrated or episomally maintained expression cassette or plasmid, and expression of the chimeric antigen receptor is expanded <i>ex vivo.</i> The clone selected for expansion demonstrates the capacity to specifically recognize and lyse antigen-expressing target cells. The recombinant T cells may be expanded by stimulation with IL-2, or other cytokines that bind the common gamma-chain (<i>e.g</i>., IL-7, IL-12, IL-15, IL-21, and others). The recombinant T cells may be expanded by stimulation with artificial antigen presenting cells. The recombinant T cells may be expanded on artificial antigen presenting cell or with an antibody, such as OKT3, which cross links CD3 on the T cell surface. Subsets of the recombinant T cells may be further selected with the use of magnetic bead based isolation methods and/or fluorescence activated cell sorting technology and further cultured with the AaPCs. In a further aspect, the genetically modified cells may be cryopreserved.

0310T cells can also be obtained from a number of sources, including peripheral blood, bone marrow, lymph node tissue, cord blood, thymus tissue, tissue from a site of infection, ascites, pleural effusion, spleen tissue, and tumor (tumor-infiltrating lymphocytes). In certain embodiments of the present disclosure, any number of T cell lines available in the art, may be used. In certain embodiments of the present disclosure, T cells can be obtained from a unit of blood collected from a subject using any number of techniques known to the skilled artisan, such as Ficoll^® separation. In embodiments, cells from the circulating blood of an individual are obtained by apheresis. The apheresis product typically contains lymphocytes, including T cells, monocytes, granulocytes, B cells, other nucleated white blood cells, red blood cells, and platelets. In one embodiment, the cells collected by apheresis may be washed to remove the plasma fraction and to place the cells in an appropriate buffer or media for subsequent processing steps. In one embodiment of the present disclosure, the cells are washed with phosphate buffered saline (PBS). In an alternative embodiment, the wash solution lacks calcium and may lack magnesium or may lack many if not all divalent cations. Initial activation steps in the absence of calcium lead to magnified activation. As those of ordinary skill in the art would readily appreciate a washing step may be accomplished by methods known to those in the art, such as by using a semi-automated "flow-through" centrifuge (for example, the Cobe 2991 cell processor, the Baxter CytoMate, or the Haemonetics Cell Saver 5) according to the manufacturer's instructions. After washing, the cells may be resuspended in a variety of biocompatible buffers, such as, for example, Ca2+-free, Mg2+-free PBS, PlasmaLyte A, or other saline solution with or without buffer. Alternatively, the undesirable components of the apheresis sample may be removed and the cells directly resuspended in culture media.

0311In another embodiment, T cells are isolated from peripheral blood lymphocytes by lysing the red blood cells and depleting the monocytes, for example, by centrifugation through a PERCOLL^® gradient or by counterflow centrifugal elutriation. A specific subpopulation of T cells, such as CD3+, CD28+, CD4+, CD8+, CD45RA+, and CD45RO+ T cells, can be further isolated by positive or negative selection techniques. For example, in one embodiment, T cells are isolated by incubation with anti-CD3/anti-CD28 (<i>i.e</i>., 3x28)-conjugated beads, such as DYNABEADS^® M-450 CD3/CD28 T, for a time period sufficient for positive selection of the desired T cells. In one embodiment, the time period is about 30 minutes. In a further embodiment, the time period ranges from 30 minutes to 36 hours or longer and all integer values there between. In a further embodiment, the time period is at least 1, 2, 3, 4, 5, or 6 hours. In yet another embodiment, the time period is 10 to 24 hours. In one embodiment, the incubation time period is 24 hours. For isolation of T cells from patients with leukemia, use of longer incubation times, such as 24 hours, can increase cell yield. Longer incubation times may be used to isolate T cells in any situation where there are few T cells as compared to other cell types, such in isolating tumor infiltrating lymphocytes (TIL) from tumor tissue or from immune-compromised individuals. Further, use of longer incubation times can increase the efficiency of capture of CD8+ T cells. Thus, by simply shortening or lengthening the time T cells are allowed to bind to the CD3/CD28 beads and/or by increasing or decreasing the ratio of beads to T cells (as described further herein), subpopulations of T cells can be preferentially selected for or against at culture initiation or at other time points during the process. Additionally, by increasing or decreasing the ratio of anti-CD3 and/or anti-CD28 antibodies on the beads or other surface, subpopulations of T cells can be preferentially selected for or against at culture initiation or at other desired time points. The skilled artisan would recognize that multiple rounds of selection can also be used in the context of this disclosure. In certain embodiments, it may be desirable to perform the selection procedure and use the "unselected" cells in the activation and expansion process. "Unselected" cells can also be subjected to further rounds of selection.

0312Enrichment of a T cell population by negative selection can be accomplished with a combination of antibodies directed to surface markers unique to the negatively selected cells. One method is cell sorting and/or selection via negative magnetic immunoadherence or flow cytometry that uses a cocktail of monoclonal antibodies directed to cell surface markers present on the cells negatively selected. For example, to enrich for CD4+ cells by negative selection, a monoclonal antibody cocktail typically includes antibodies to CD14, CD20, CD11b, CD16, HLA-DR, and CD8. In certain embodiments, it may be desirable to enrich for or positively select for regulatory T cells which typically express CD4+, CD25+, CD62Lhi, GITR+, and FoxP3+. Alternatively, in certain embodiments, T regulatory cells are depleted by anti-CD25 conjugated beads or other similar method of selection.

0313For isolation of a desired population of cells by positive or negative selection, the concentration of cells and surface (<i>e.g</i>., particles such as beads) can be varied. In certain embodiments, it may be desirable to significantly decrease the volume in which beads and cells are mixed together (<i>i.e</i>., increase the concentration of cells), to ensure maximum contact of cells and beads. For example, in one embodiment, a concentration of 2 billion cells/ml is used. In one embodiment, a concentration of 1 billion cells/ml is used. In a further embodiment, greater than 100 million cells/ml is used. In a further embodiment, a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used. In yet another embodiment, a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used. In further embodiments, concentrations of 125 or 150 million cells/ml can be used. Using high concentrations can result in increased cell yield, cell activation, and cell expansion. Further, use of high cell concentrations allows more efficient capture of cells that may weakly express target antigens of interest, such as CD28-negative T cells, or from samples where there are many tumor cells present (<i>i.e</i>., leukemic blood, tumor tissue, etc.). Such populations of cells may have therapeutic value and would be desirable to obtain. For example, using high concentration of cells allows more efficient selection of CD8+ T cells that normally have weaker CD28 expression.

0314In a related embodiment, it may be desirable to use lower concentrations of cells. By significantly diluting the mixture of T cells and surface (<i>e.g</i>., particles such as beads), interactions between the particles and cells is minimized. This selects for cells that express high amounts of desired antigens to be bound to the particles. For example, CD4+ T cells express higher levels of CD28 and are more efficiently captured than CD8+ T cells in dilute concentrations. In one embodiment, the concentration of cells used is 5x106/ml. In other embodiments, the concentration used can be from about 1x105/ml to 1x106/ml, and any integer value in between.

0315In other embodiments, the cells may be incubated on a rotator for varying lengths of time at varying speeds at either 2-10o C or at room temperature.

0316T cells for stimulation can also be frozen after a washing step. After the washing step that removes plasma and platelets, the cells may be suspended in a freezing solution. While many freezing solutions and parameters are known in the art and will be useful in this context, one method involves using PBS containing 20% DMSO and 8% human serum albumin, or culture media containing 10% Dextran 40 and 5% Dextrose, 20% Human Serum Albumin and 7.5% DMSO, or 31.25% Plasmalyte-A, 31.25% Dextrose 5%, 0.45% NaCl, 10% Dextran 40 and 5% Dextrose, 20% Human Serum Albumin, and 7.5% DMSO or other suitable cell freezing media containing for example, Hespan and PlasmaLyte A, the cells then are frozen to -80o C at a rate of 1o per minute and stored in the vapor phase of a liquid nitrogen storage tank. Other methods of controlled freezing may be used as well as uncontrolled freezing immediately at -20o C or in liquid nitrogen.

0317In certain embodiments, cryopreserved cells are thawed and washed as described herein and allowed to rest for one hour at room temperature prior to activation using the methods of the present disclosure.

0318Also contemplated in the context of the present disclosure is the collection of blood samples or apheresis product from a subject at a time period prior to when the expanded cells as described herein might be needed. As such, the source of the cells to be expanded can be collected at any time point necessary, and desired cells, such as T cells, isolated and frozen for later use in T cell therapy for any number of diseases or conditions that would benefit from T cell therapy, such as those described herein. In one embodiment a blood sample or an apheresis is taken from a generally healthy subject. In certain embodiments, a blood sample or an apheresis is taken from a generally healthy subject who is at risk of developing a disease, but who has not yet developed a disease, and the cells of interest are isolated and frozen for later use. In certain embodiments, the T cells may be expanded, frozen, and used at a later time. In certain embodiments, samples are collected from a patient shortly after diagnosis of a particular disease as described herein but prior to any treatments. In a further embodiment, the cells are isolated from a blood sample or an apheresis from a subject prior to any number of relevant treatment modalities, including but not limited to treatment with agents such as natalizumab, efalizumab, antiviral agents, chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAMPATH, anti-CD3 antibodies, cytoxan, fludarabine, cyclosporin, FK506, rapamycin, mycophenolic acid, steroids, FR901228, and irradiation. These drugs inhibit either the calcium dependent phosphatase calcineurin (cyclosporine and FK506) or inhibit the p70S6 kinase that is important for growth factor induced signaling (rapamycin) (<nplcit id="ncit0052" npl-type="s"><text>Liu et al., Cell 66:807-815, (1991</text></nplcit>); <nplcit id="ncit0053" npl-type="s"><text>Henderson et al., Immun 73:316-321, (1991</text></nplcit>); <nplcit id="ncit0054" npl-type="s"><text>Bierer et al., Curr. Opin. Immun 5:763-773, (1993</text></nplcit>)). In a further embodiment, the cells are isolated for a patient and frozen for later use in conjunction with (<i>e.g</i>., before, simultaneously or following) bone marrow or stem cell transplantation, T cell ablative therapy using either chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT), cyclophosphamide, or antibodies such as OKT3 or CAMPATH. In another embodiment, the cells are isolated prior to and can be frozen for later use for treatment following B-cell ablative therapy such as agents that react with CD20, <i>e.g</i>., Rituxan.

0319In a further embodiment of the present disclosure, T cells are obtained from a patient directly following treatment. In this regard, it has been observed that following certain cancer treatments, in particular treatments with drugs that damage the immune system, shortly after treatment during the period when patients would normally be recovering from the treatment, the quality of T cells obtained may be optimal or improved for their ability to expand <i>ex vivo.</i> Likewise, following <i>ex vivo</i> manipulation using the methods described herein, these cells may be in a preferred state for enhanced engraftment and <i>in vivo</i> expansion. Thus, it is contemplated within the context of the present disclosure to collect blood cells, including T cells, dendritic cells, or other cells of the hematopoietic lineage, during this recovery phase. Further, in certain embodiments, mobilization (for example, mobilization with GM-CSF) and conditioning regimens can be used to create a condition in a subject wherein repopulation, recirculation, regeneration, and/or expansion of particular cell types is favored, especially during a defined window of time following therapy. Illustrative cell types include T cells, B cells, dendritic cells, and other cells of the immune system.

Activation and Expansion of T Cells

0320In certain embodiments are T cells comprising polynucleotides encoding gene-switch polypeptides for expressing an interleukin, CARs and/or TCRs described herein Whether prior to or after genetic modification of the T cells to express a desirable CAR, the T cells can be activated and expanded generally using methods as described, for example, in <patcit id="pcit0184" dnum="US6352694B"><text>U.S. Pat. Nos. 6,352,694</text></patcit>; <patcit id="pcit0185" dnum="US6534055B"><text>6,534,055</text></patcit>; <patcit id="pcit0186" dnum="US6905680B"><text>6,905,680</text></patcit>; <patcit id="pcit0187" dnum="US6692964B"><text>6,692,964</text></patcit>; <patcit id="pcit0188" dnum="US5858358A"><text>5,858,358</text></patcit>; <patcit id="pcit0189" dnum="US6887466B"><text>6,887,466</text></patcit>; <patcit id="pcit0190" dnum="US6905681B"><text>6,905,681</text></patcit>; <patcit id="pcit0191" dnum="US7144575B"><text>7,144,575</text></patcit>; <patcit id="pcit0192" dnum="US7067318B"><text>7,067,318</text></patcit>; <patcit id="pcit0193" dnum="US7172869B"><text>7,172,869</text></patcit>; <patcit id="pcit0194" dnum="US7232566B"><text>7,232,566</text></patcit>; <patcit id="pcit0195" dnum="US7175843B"><text>7,175,843</text></patcit>; <patcit id="pcit0196" dnum="US5883223A"><text>5,883,223</text></patcit>; <patcit id="pcit0197" dnum="US6905874B"><text>6,905,874</text></patcit>; <patcit id="pcit0198" dnum="US6797514B"><text>6,797,514</text></patcit>; <patcit id="pcit0199" dnum="US6867041B"><text>6,867,041</text></patcit>; and <patcit id="pcit0200" dnum="US20060121005"><text>U.S. Patent Application Publication No. 20060121005</text></patcit>.

0321"Adoptive T cell transfer" refers to the isolation and <i>ex vivo</i> or <i>in vivo</i> expansion of tumor specific T cells to achieve greater number of T cells than what could be obtained by vaccination alone or the patient's natural tumor response. The tumor specific T cells are then infused into patients with cancer in an attempt to give their immune system the ability to overwhelm remaining tumor via T cells which can attack and kill cancer. There are many forms of adoptive T cell therapy being used for cancer treatment; culturing tumor infiltrating lymphocytes or TIL, isolating and expanding one particular T cell or clone, and even using T cells that have been engineered to potently recognize and attack tumors. In some aspects, adoptive T-cell therapy can include engineered antigen-specific T cells that are modified and immediately infused into a patient, thus allowing <i>in vivo</i> expansion of antigen-specific T cells to occur within the patient.

0322In some cases, T cells described herein are activated and/or expanded by contact with a surface having attached thereto an agent that stimulates a CD3/TCR complex associated signal and a ligand that stimulates a co-stimulatory molecule on the surface of the T cells. In particular, T cell populations may be stimulated as described herein, such as by contact with an anti-CD3 antibody, or antigen-binding fragment thereof, or an anti-CD2 antibody immobilized on a surface, or by contact with a protein kinase C activator (<i>e.g</i>., bryostatin) in conjunction with a calcium ionophore. For co-stimulation of an accessory molecule on the surface of the T cells, a ligand that binds the accessory molecule is used. For example, a population of T cells can be contacted with an anti-CD3 antibody and an anti-CD28 antibody, under conditions appropriate for stimulating proliferation of the T cells. To stimulate proliferation of either CD4+ T cells or CD8+ T cells, an anti-CD3 antibody and an anti-CD28 antibody. Examples of an anti-CD28 antibody include 9.3, B-T3, XR-CD28 (Diaclone, Besancon, France) can be used as can other methods commonly known in the art (<nplcit id="ncit0055" npl-type="s"><text>Berg et al., Transplant Proc. 30(8):3975-3977, (1998</text></nplcit>); <nplcit id="ncit0056" npl-type="s"><text>Haanen et al., J. Exp. Med. 190(9):13191328, (1999</text></nplcit>); <nplcit id="ncit0057" npl-type="s"><text>Garland et al., J. Immunol Meth. 227(1-2):53-63, (1999</text></nplcit>)).

0323In certain embodiments, the primary stimulatory signal and the co-stimulatory signal for the T cell may be provided by different protocols. For example, the agents providing each signal may be in solution or coupled to a surface. When coupled to a surface, the agents may be coupled to the same surface (<i>i.e</i>., in "cis" formation) or to separate surfaces (<i>i.e</i>., in "trans" formation). Alternatively, one agent may be coupled to a surface and the other agent in solution. In one embodiment, the agent providing the co-stimulatory signal is bound to a cell surface and the agent providing the primary activation signal is in solution or coupled to a surface. In certain embodiments, both agents can be in solution. In another embodiment, the agents may be in soluble form, and then cross-linked to a surface, such as a cell expressing Fc receptors or an antibody or other binding agent which will bind to the agents. In this regard, see for example, <patcit id="pcit0201" dnum="US20040101519"><text>U.S. Patent Application Publication Nos. 20040101519</text></patcit> and <patcit id="pcit0202" dnum="US20060034810A"><text>20060034810</text></patcit> for artificial antigen presenting cells (AaPC) that are contemplated for use in activating and expanding T cells in the present disclosure.

0324In one embodiment, the two agents are immobilized on beads, either on the same bead, <i>i.e.</i>, "cis," or to separate beads, <i>i.e</i>., "trans." By way of example, the agent providing the primary activation signal is an anti-CD3 antibody or an antigen-binding fragment thereof and the agent providing the co-stimulatory signal is an anti-CD28 antibody or antigen-binding fragment thereof; and both agents are co-immobilized to the same bead in equivalent molecular amounts. In one embodiment, a 1:1 ratio of each antibody bound to the beads for CD4+ T cell expansion and T cell growth is used. In certain aspects of the present disclosure, a ratio of anti CD3:CD28 antibodies bound to the beads is used such that an increase in T cell expansion is observed as compared to the expansion observed using a ratio of 1:1. In one particular embodiment an increase of from about 1 to about 3 fold is observed as compared to the expansion observed using a ratio of 1:1. In one embodiment, the ratio of CD3 :CD28 antibody bound to the beads ranges from 100:1 to 1:100 and all integer values there between. In one aspect of the present disclosure, more anti-CD28 antibody is bound to the particles than anti-CD3 antibody, <i>i.e</i>., the ratio of CD3:CD28 is less than one. In certain embodiments of the present disclosure, the ratio of anti CD28 antibody to anti CD3 antibody bound to the beads is greater than 2:1. In one particular embodiment, a 1:100 CD3:CD28 ratio of antibody bound to beads is used. In another embodiment, a 1:75 CD3:CD28 ratio of antibody bound to beads is used. In a further embodiment, a 1:50 CD3:CD28 ratio of antibody bound to beads is used. In another embodiment, a 1:30 CD3:CD28 ratio of antibody bound to beads is used. In embodiments, a 1:10 CD3:CD28 ratio of antibody bound to beads is used. In another embodiment, a 1:3 CD3:CD28 ratio of antibody bound to the beads is used. In yet another embodiment, a 3:1 CD3:CD28 ratio of antibody bound to the beads is used.

0325Ratios of particles to cells from 1:500 to 500:1 and any integer values in between may be used to stimulate T cells or other target cells. As those of ordinary skill in the art can readily appreciate, the ratio of particles to cells may depend on particle size relative to the target cell. For example, small sized beads could only bind a few cells, while larger beads could bind many. In certain embodiments the ratio of cells to particles ranges from 1:100 to 100:1 and any integer values in-between and in further embodiments the ratio comprises 1:9 to 9:1 and any integer values in between, can also be used to stimulate T cells. The ratio of anti-CD3- and anti-CD28-coupled particles to T cells that result in T cell stimulation can vary as noted above, however certain values include 1:100, 1:50, 1:40, 1:30, 1:20, 1:10, 1:9, 1:8, 1:7, 1:6, 1:5, 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, and 15:1 with one ratio being at least 1:1 particles per T cell. In one embodiment, a ratio of particles to cells of 1:1 or less is used. In one particular embodiment, the particle:cell ratio is 1:5. In further embodiments, the ratio of particles to cells can be varied depending on the day of stimulation. For example, in one embodiment, the ratio of particles to cells is from 1:1 to 10:1 on the first day and additional particles are added to the cells every day or every other day thereafter for up to 10 days, at final ratios of from 1:1 to 1:10 (based on cell counts on the day of addition). In one particular embodiment, the ratio of particles to cells is 1:1 on the first day of stimulation and adjusted to 1:5 on the third and fifth days of stimulation. In another embodiment, particles are added on a daily or every other day basis to a final ratio of 1:1 on the first day, and 1:5 on the third and fifth days of stimulation. In another embodiment, the ratio of particles to cells is 2:1 on the first day of stimulation and adjusted to 1:10 on the third and fifth days of stimulation. In another embodiment, particles are added on a daily or every other day basis to a final ratio of 1:1 on the first day, and 1:10 on the third and fifth days of stimulation. One of skill in the art will appreciate that a variety of other ratios may be suitable for use in the present disclosure. In particular, ratios will vary depending on particle size and on cell size and type.

0326In further embodiments of the present disclosure, the cells, such as T cells, are combined with agent-coated beads, the beads and the cells are subsequently separated, and then the cells are cultured. In an alternative embodiment, prior to culture, the agent-coated beads and cells are not separated but are cultured together. In a further embodiment, the beads and cells are first concentrated by application of a force, such as a magnetic force, resulting in increased ligation of cell surface markers, thereby inducing cell stimulation.

0327By way of example, cell surface proteins may be ligated by allowing paramagnetic beads to which anti-CD3 and anti-CD28 are attached (3x28 beads) to contact the T cells. In one embodiment the cells (for example, 104 to 109 T cells) and beads (for example, DYNABEADS^® M-450 CD3/CD28 T paramagnetic beads at a ratio of 1:1, or MACS^® MicroBeads from Miltenyi Biotec) are combined in a buffer, for example, PBS (without divalent cations such as, calcium and magnesium). Again, those of ordinary skill in the art can readily appreciate any cell concentration may be used. For example, the target cell may be very rare in the sample and comprise only 0.01% of the sample or the entire sample (<i>i.e</i>., 100%) may comprise the target cell of interest. Accordingly, any cell number is within the context of the present disclosure. In certain embodiments, it may be desirable to significantly decrease the volume in which particles and cells are mixed together (<i>i.e</i>., increase the concentration of cells), to ensure maximum contact of cells and particles. For example, in one embodiment, a concentration of about 2 billion cells/ml is used. In another embodiment, greater than 100 million cells/ml is used. In a further embodiment, a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used. In yet another embodiment, a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used. In further embodiments, concentrations of 125 or 150 million cells/ml can be used. Using high concentrations can result in increased cell yield, cell activation, and cell expansion. Further, use of high cell concentrations allows more efficient capture of cells that may weakly express target antigens of interest, such as CD28-negative T cells. Such populations of cells may have therapeutic value and would be desirable to obtain in certain embodiments. For example, using high concentration of cells allows more efficient selection of CD8+ T cells that normally have weaker CD28 expression.

0328In one embodiment of the present disclosure, the mixture may be cultured for several hours (about 3 hours) to about 14 days or any hourly integer value in between. In another embodiment, the mixture may be cultured for 21 days. In one embodiment of the present disclosure the beads and the T cells are cultured together for about eight days. In another embodiment, the beads and T cells are cultured together for 2-3 days. Several cycles of stimulation may also be desired such that culture time of T cells can be 60 days or more. Conditions appropriate for T cell culture include an appropriate media (<i>e.g</i>., Minimal Essential Media or RPMI Media 1640 or, X-vivo 15, (Lonza)) that may contain factors necessary for proliferation and viability, including serum (<i>e.g</i>., fetal bovine or human serum), interleukin-2 (IL-2), insulin, IFN-.gamma., IL-4, IL-7, GM-CSF, IL-10, IL-12, IL-15, TGFbeta, and TNF-alpha or any other additives for the growth of cells known to the skilled artisan. Other additives for the growth of cells include, but are not limited to, surfactant, plasmanate, and reducing agents such as N-acetyl-cysteine and 2-mercaptoethanol. Media can include RPMI 1640, AIM-V, DMEM, MEM, alpha-MEM, F-12, X-Vivo 15, and X-Vivo 20, Optimizer, with added amino acids, sodium pyruvate, and vitamins, either serum-free or supplemented with an appropriate amount of serum (or plasma) or a defined set of hormones, and/or an amount of cytokine(s) sufficient for the growth and expansion of T cells. Antibiotics, <i>e.g</i>., penicillin and streptomycin, are included only in experimental cultures, not in cultures of cells that are to be infused into a subject. The target cells are maintained under conditions necessary to support growth, for example, an appropriate temperature (<i>e.g</i>., 37o C.) and atmosphere (<i>e.g</i>., air plus 5% CO2).

0329T cells that have been exposed to varied stimulation times may exhibit different characteristics. For example, typical blood or apheresed peripheral blood mononuclear cell products have a helper T cell population (TH, CD4+) that is greater than the cytotoxic or suppressor T cell population (TC, CD8+). <i>Ex vivo</i> expansion of T cells by stimulating CD3 and CD28 receptors produces a population of T cells that prior to about days 8-9 consists predominately of TH cells, while after about days 8-9, the population of T cells comprises an increasingly greater population of TC cells. Accordingly, depending on the purpose of treatment, infusing a subject with a T cell population comprising predominately of TH cells may be advantageous. Similarly, if an antigen-specific subset of TC cells has been isolated it may be beneficial to expand this subset to a greater degree.

0330Further, in addition to CD4 and CD8 markers, other phenotypic markers vary significantly, but in large part, reproducibly during the course of the cell expansion process. Thus, such reproducibility enables the ability to tailor an activated T cell product for specific purposes.

0331In some cases, immune effector cells of the embodiments (<i>e.g</i>., T-cells) are co-cultured with activating and propagating cells (AaPCs), to aid in cell expansion. AaPCs can also be referred to as artificial Antigen Presenting cells (AaPCs). For example, antigen presenting cells (APCs) are useful in preparing therapeutic compositions and cell therapy products of the embodiments. In one aspect, the AaPCs may be transgenic K562 cells. For general guidance regarding the preparation and use of antigen-presenting systems, see, <i>e.g</i>., <patcit id="pcit0203" dnum="US6225042B"><text>U.S. Pat. Nos. 6,225,042</text></patcit>, <patcit id="pcit0204" dnum="US6355479B"><text>6,355,479</text></patcit>, <patcit id="pcit0205" dnum="US6362001B"><text>6,362,001</text></patcit> and <patcit id="pcit0206" dnum="US6790662B"><text>6,790,662</text></patcit>; <patcit id="pcit0207" dnum="US20090017000"><text>U.S. Patent Application Publication Nos. 2009/0017000</text></patcit> and <patcit id="pcit0208" dnum="US20090004142A"><text>2009/0004142</text></patcit>; and International Publication No. <patcit id="pcit0209" dnum="WO2007103009A"><text>WO2007/103009</text></patcit>, each of which is incorporated by reference. In yet a further aspect of the embodiments, culturing the transgenic CAR cells comprises culturing the transgenic CAR cells in the presence of dendritic cells or activating and propagating cells (AaPCs) that stimulate expansion of the CAR-expressing immune effector cells. In still further aspects, the AaPCs comprise a CAR-binding antibody or fragment thereof expressed on the surface of the AaPCs. In other embodiments, the AaPCS comprise a TCR-binding polypeptide or TCR binding antibody or fragment thereof expressed on the surface of the AaPCs. The AaPCs may comprise additional molecules that activate or co-stimulate T-cells in some cases. The additional molecules may, in some cases, comprise membrane-bound Cγ cytokines. In yet still further aspects, the AaPCs are inactivated or irradiated, or have been tested for and confirmed to be free of infectious material. In still further aspects, culturing the transgenic CAR cells in the presence of AaPCs comprises culturing the transgenic CAR cells in a medium comprising soluble cytokines, such as IL-15, IL-21 and/or IL-2. The cells may be cultured at a ratio of about 10:1 to about 1:10; about 3:1 to about 1:5; about 1:1 to about 1:3 (immune effector cells to AaPCs); or any range derivable therein. For example, the co-culture of T cells and AaPCs can be at a ratio of about 1:1, about 1:2 or about 1:3.

0332In one aspect, the AaPCs may express CD137L. In other aspects, the AaPCs may further express CD19, CD64, CD86, or mIL15. In certain aspects, the AaPCs may express at least one anti-CD3 antibody clone, such as, for example, OKT3 and/or UCHT1. In one aspect, the AaPCs may be treated (<i>e.g</i>. irradiated or mytomycin C) to eliminate their growth potential. In one aspect, the AaPCs may have been tested for and confirmed to be free of infectious material. Methods for producing such AaPCs are known in the art. In one aspect, culturing the CAR-modified T cell population with AaPCs may comprise culturing the cells at a ratio of about 10:1 to about 1:10; about 3:1 to about 1:5; about 1:1 to about 1:3 (T cells to AaPCs); or any range derivable therein. For example, the co-culture of T cells and AaPCs can be at a ratio of about 1:1, about 1:2 or about 1:3. In one aspect, the culturing step may further comprise culturing with an aminobisphosphonate (<i>e.g</i>., zoledronic acid).

0333In a further aspect, the population of CAR-T cells is cultured and/or stimulated for no more than 7, 14, 21, 28, 35 42 days, 49, 56, 63 or 70 days. In some embodiments, the population of CAR-T cells is cultured and/or stimulated for at least 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 or more days. In some embodiments, the population of CAR-T cells is cultured and/or stimulated for at least 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 or more days. In some embodiments, the population of CAR-T cells is cultured and/or stimulated for at least 7, 14, 21, 28, 35, 42, 49, 56, 63 or more days. In other embodiments, a stimulation includes the co-culture of the CAR-T cells with AaPCs to promote the growth of CAR positive T cells. In another aspect, the population of transgenic CAR cells is stimulated for not more than: 1X stimulation, 2X stimulation, 3X stimulation, 4X stimulation, 5X stimulation, 5X stimulation, 6X stimulation, 7X stimulation, 8X stimulation, 9X stimulation or 10X stimulation. In some instances, the transgenic cells are not cultured <i>ex vivo</i> in the presence of AaPCs. In some specific instances, the method of the embodiment further comprises enriching the cell population for CAR-expressing immune effector cells (<i>e.g</i>., T-cells) after the transfection and/or culturing step. The enriching may comprise fluorescence-activated cell sorting (FACS) and sorting for CAR-expressing cells. In a further aspect, the sorting for CAR-expressing cells comprises use of a CAR-binding antibody. The enriching may also comprise depletion of CD56+ cells. In yet still a further aspect of the embodiment, the method further comprises cryopreserving a sample of the population of transgenic CAR cells.

0334In some cases, AaPCs are incubated with a peptide of an optimal length that allows for direct binding of the peptide to the MHC molecule without additional processing. Alternatively, the cells can express an antigen of interest (<i>i.e.</i>, in the case of MHC-independent antigen recognition). Furthermore, in some cases, APCs can express an antibody that binds to either a specific CAR polypeptide or to CAR polypeptides in general (<i>e.g</i>., a universal activating and propagating cell (uAPC). Such methods are disclosed in <patcit id="pcit0210" dnum="WO2014190273A"><text>WO/2014/190273</text></patcit>, which is incorporated herein by reference. In addition to peptide-MHC molecules or antigens of interest, the AaPC systems may also comprise at least one exogenous assisting molecule. Any suitable number and combination of assisting molecules may be employed. The assisting molecule may be selected from assisting molecules such as co-stimulatory molecules and adhesion molecules. Exemplary co-stimulatory molecules include CD70 and B7.1 (B7.1 was previously known as B7 and also known as CD80), which among other things, bind to CD28 and/or CTLA-4 molecules on the surface of T cells, thereby affecting, for example, T-cell expansion, Th1 differentiation, short-term T-cell survival, and cytokine secretion such as interleukin (IL)-2. Adhesion molecules may include carbohydrate-binding glycoproteins such as selectins, transmembrane binding glycoproteins such as integrins, calcium-dependent proteins such as cadherins, and single-pass transmembrane immunoglobulin (Ig) superfamily proteins, such as intercellular adhesion molecules (ICAMs), that promote, for example, cell-to-cell or cell-to-matrix contact. Exemplary adhesion molecules include LFA-3 and ICAMs, such as ICAM-1. Techniques, methods, and reagents useful for selection, cloning, preparation, and expression of exemplary assisting molecules, including co-stimulatory molecules and adhesion molecules, are exemplified in, <i>e.g</i>., <patcit id="pcit0211" dnum="US6225042B"><text>U.S. Pat. Nos. 6,225,042</text></patcit>, <patcit id="pcit0212" dnum="US6355479B"><text>6,355,479</text></patcit>, and <patcit id="pcit0213" dnum="US6362001B"><text>6,362,001</text></patcit>, incorporated herein by reference.

0335Cells selected to become AaPCs, preferably have deficiencies in intracellular antigen-processing, intracellular peptide trafficking, and/or intracellular MHC Class I or Class II molecule-peptide loading, or are poikilothermic (<i>i.e</i>., less sensitive to temperature challenge than mammalian cell lines), or possess both deficiencies and poikilothermic properties. Preferably, cells selected to become AaPCs also lack the ability to express at least one endogenous counterpart (<i>e.g</i>., endogenous MHC Class I or Class II molecule and/or endogenous assisting molecules as described above) to the exogenous MHC Class I or Class II molecule and assisting molecule components that are introduced into the cells. Furthermore, AaPCs preferably retain the deficiencies and poikilothermic properties that were possessed by the cells prior to their modification to generate the AaPCs. Exemplary AaPCs either constitute or are derived from a transporter associated with antigen processing (TAP)-deficient cell line, such as an insect cell line. An exemplary poikilothermic insect cells line is a Drosophila cell line, such as a Schneider 2 cell line (see, <i>e.g</i>., Schneider 1972 Illustrative methods for the preparation, growth, and culture of Schneider 2 cells, are provided in <patcit id="pcit0214" dnum="US6225042B"><text>U.S. Pat. Nos. 6,225,042</text></patcit>, <patcit id="pcit0215" dnum="US6355479B"><text>6,355,479</text></patcit>, and <patcit id="pcit0216" dnum="US6362001B"><text>6,362,001</text></patcit>.

0336In one embodiment, AaPCs are also subjected to a freeze-thaw cycle. In an exemplary freeze-thaw cycle, the AaPCs may be frozen by contacting a suitable receptacle containing the AaPCs with an appropriate amount of liquid nitrogen, solid carbon dioxide (<i>i.e</i>., dry ice), or similar low-temperature material, such that freezing occurs rapidly. The frozen APCs are then thawed, either by removal of the AaPCs from the low-temperature material and exposure to ambient room temperature conditions, or by a facilitated thawing process in which a lukewarm water bath or warm hand is employed to facilitate a shorter thawing time. Additionally, AaPCs may be frozen and stored for an extended period of time prior to thawing. Frozen AaPCs may also be thawed and then lyophilized before further use. Preferably, preservatives that might detrimentally impact the freeze-thaw procedures, such as dimethyl sulfoxide (DMSO), polyethylene glycols (PEGs), and other preservatives, are absent from media containing AaPCs that undergo the freeze-thaw cycle, or are essentially removed, such as by transfer of AaPCs to media that is essentially devoid of such preservatives.

0337In further embodiments, xenogenic nucleic acid and nucleic acid endogenous to the AaPCs, may be inactivated by crosslinking, so that essentially no cell growth, replication or expression of nucleic acid occurs after the inactivation. In one embodiment, AaPCs are inactivated at a point subsequent to the expression of exogenous MHC and assisting molecules, presentation of such molecules on the surface of the AaPCs, and loading of presented MHC molecules with selected peptide or peptides. Accordingly, such inactivated and selected peptide loaded AaPCs, while rendered essentially incapable of proliferating or replicating, retain selected peptide presentation function. Preferably, the crosslinking also yields AaPCs that are essentially free of contaminating microorganisms, such as bacteria and viruses, without substantially decreasing the antigen-presenting cell function of the AaPCs. Thus crosslinking maintains the important AaPC functions of while helping to alleviate concerns about safety of a cell therapy product developed using the AaPCs. For methods related to crosslinking and AaPCs, see for example, <patcit id="pcit0217" dnum="US20090017000"><text>U.S. Patent Application Publication No. 20090017000</text></patcit>, which is incorporated herein by reference.

0338In certain embodiments there are further provided an engineered antigen presenting cell (APC). Such cells may be used, for example, as described above, to propagate immune effector cells <i>ex vivo.</i> In further aspects, engineered APCs may, themselves be administered to a patient and thereby stimulate expansion of immune effector cells <i>in vivo.</i> Engineered APCs of the embodiments may, themselves, be used as a therapeutic agent. In other embodiments, the engineered APCs can used as a therapeutic agent that can stimulate activation of endogenous immune effector cells specific for a target antigen and/or to increase the activity or persistence of adoptively transferred immune effector cells specific to a target antigen.

0339As used herein the term "engineered APC" refers to cell(s) that comprises at least a first transgene, wherein the first transgene encodes a HLA. Such engineered APCs may further comprise a second transgene for expression of an antigen, such that the antigen is presented at the surface on the APC in complex with the HLA. In some aspects, the engineered APC can be a cell type that presented antigens (<i>e.g</i>., a dendritic cell). In further aspects, engineered APC can be produced from a cell type that does not normally present antigens, such a T-cell or T-cell progenitor (referred to as "T-APC"). Thus, in some aspects, an engineered APC of the embodiments comprises a first transgene encoding a target antigen and a second transgene encoding a human leukocyte antigen (HLA), such that the HLA is expressed on the surface of the engineered APC in complex with an epitope of the target antigen. In certain specific aspects, the HLA expressed in the engineered APC is HLA-A2.

0340In some aspects, an engineered APC of the embodiments may further comprise at least a third transgene encoding co-stimulatory molecule. The co-stimulatory molecule may be a co-stimulatory cytokine that may be a membrane-bound Cγ cytokine. In certain aspects, the co-stimulatory cytokine is IL-15, such as membrane-bound IL-15. In some further aspects, an engineered APC may comprise an edited (or deleted) gene. For example, an inhibitory gene, such as PD-1, LIM-3, CTLA-4 or a TCR, can be edited to reduce or eliminate expression of the gene. An engineered APC of the embodiments may further comprise a transgene encoding any target antigen of interest. For example, the target antigen can be an infectious disease antigen or a tumor-associated antigen (TAA).

Methods of Regulating Expression

0341In one embodiment, a method of regulating the expression of a heterologous gene in an engineered cell is provided. Polynucleotides encoding for gene switch polypeptides for ligand inducible control of a heterologous gene expression, an antigen binding polypeptide and a heterologous gene is provided. In some instances, the polynucleotides are in one or more gene expression cassettes as depicted in any one of <figref idref="f0001 f0002 f0003 f0004 f0005 f0006 f0007 f0008 f0009 f0010 f0011 f0012 f0013 f0014 f0015 f0016 f0017 f0018 f0019 f0020 f0021 f0022 f0023 f0024">Figures 1 through 16</figref>. In another instance, the polynucleotides are incorporated into an engineered cell via viral or non-viral vectors. Viral vectors can include lentiviral vectors, retroviral vectors or adenoviral vectors. Non-viral vectors can include Sleeping Beauty transposons. In other instances, the polynucleotides are incorporated into an engineered cell via recombinases or gene editing techniques. Examples of recombinases are serine recombinases as described herein. Examples of gene editing techniques can include CRISPR or Argnonaute systems. Herein a "CRISPR gene editing system" of "CRISPR system" refers to any RNA-guided Cas protein-mediated process for targeting a change in DNA sequence to a specific region of a genome. Herein "Argonaute gene editing system" refers to any single-stranded DNA guided Argonaute endonuclease-mediated process for targeting a change in DNA sequence to a specific region of a genome.

0342In some instances, the antigen binding polypeptide can be an antigen binding polypeptide or a ligand binding polypeptide. For example, an antigen binding polypeptide can be an antibody or a fragment thereof, F(ab')2, Fab', Fab, Fv, scFv, variable fragments of heavy chain antibodies (VHHs), a CAR, or an engineered TCR. As a further example, a ligand binding polypeptide can be a receptor. In certain aspects, the heterologous gene is a cytokine. The cytokine can be IL-2, IL-15, IL-12, IL-21, or a fusion of IL-15 and IL-15R (mbIL-15). In certain instances, the cytokine is IL-12. For example, the IL-12 is a single chain IL-12 (scIL-12), protease sensitive IL-12, destabilized IL-12, membrane bound IL-12, intercalated IL-12. In some cases, the heterologous gene is under the control of an inducible promoter. For example, the inducible promoter is a gene switch ligand-inducible promoter for gene transcription.

0343In certain instances, the cell is an engineered cell. Herein an engineered cell is a cell which has been modified from its natural or endogenous state. An example of an engineered cell is a cell described herein which has been modified (<i>e.g</i>., by transfection of a polynucleotide into the cell). In some instances, the engineered cell can be an engineered immune effector cell.

0344Provided herein is a method to regulate the expression of a heterologous gene wherein the heterologous gene is under the control of a ligand inducible promoter. In some instances, the method results in a low or no basal level of heterologous gene expression in the absence of the ligand. In one instance, the engineered cells are activated prior to inducing the expression of the heterologous gene with a ligand. In another instance, the engineered cells are activated by exposing the cells to an antigen. The antigen can be an antigen that is recognized by the antigen binding polypeptide expressed by the engineered cell. The antigen can be a tumor antigen or an infectious disease antigen.

0345The engineered cells can be exposed to the antigen for at least: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 days. In some instances, the engineered cells can be exposed to the antigen for at least: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 hours.

0346In another instance, a population of immune effector cells that have been transduced with the vectors encompassing gene switch polypeptides and inducible gene of interest (described herein in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>, <figref idref="f0006">FIG. 3</figref>,<figref idref="f0029 f0030">FIG. 19A-19B</figref>, <figref idref="f0031">FIG. 20A</figref>, <figref idref="f0038">FIG. 22</figref>, <figref idref="f0040 f0041 f0042 f0043">FIG. 24A-24D</figref>, and <figref idref="f0044 f0045">FIG. 25A-25B</figref>) is cultured and/or stimulated with an engineered AaPC of the embodiments for at least 1X stimulation, 2X stimulation, 3X stimulation or 4X stimulation. In some instances, the engineered AaPC comprises an antigen or a ligand that is recognized by the binding polypeptide expressed on the engineered cells. Following the last stimulation, the cells are allowed to rest before infusion into a patient. The patient is then given the appropriate dose of a ligand used for inducible gene switch regulation to activate and express the gene of interest. In one aspect, the ligand is veledimex. In another aspect, veledimex is provided at 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg or 100 mg. In a further aspect, lower doses of veledimex are provided, for example, 0.5 mg, 1 mg, 5 mg, 10 mg, 15 mg or 20 mg.

Point-of-Care

0347In one embodiment of the present disclosure, the immune effector cells described herein are modified at a point-of-care site. In some cases, the point-of-care site is at a hospital or at a facility (<i>e.g</i>., a medical facility) near a subject in need of treatment. The subject undergoes apheresis and peripheral blood mononuclear cells (PBMCs) obtained can be enriched for example, by elutriation. In one instance, the elutriation process is performed using a buffer solution containing human serum albumin. Immune effector cells, such as T cells can be isolated by selection methods described herein. In one instance, the selection method for T cells includes beads specific for CD3 and CD8 on T cells. In one case, the beads can be paramagnetic beads. The harvested immune effector cells can be cryopreserved in any appropriate cryopreservation solution prior to modification. The immune effector cells can be thawed up to 24 hours, 36 hours, 48 hours. 72 hours or 96 hours ahead of infusion. The thawed cells can be placed in cell culture buffer, for example in cell culture buffer (e.g. RPMI) supplemented with fetal bovine serum (FBS) or placed in a buffer that includes IL-2 and IL-21, prior to modification. In another aspect, the harvested immune effector cells can be modified immediately without the need for cryopreservation.

0348In some cases, the immune effector cells are modified by engineering/introducing a chimeric receptor, one or more cell tag(s), and/or cytokine into the immune effector cells and then rapidly infused into a subject. In some cases, the sources of immune effector cells can include both allogeneic and autologous sources. In one case, the immune effector cells can be T cells or NK cells. In one case, the chimeric receptor can be a CAR or a TCR. In another case, the cytokine can be mb IL-15. In one case, the mbIL-15 is of SEQ ID NO:15, or variant or fragment thereof. In yet another case, expression of mbII,-15 is modulated by ligand inducible gene-switch expression systems described herein. For example, a ligand such as veledimex can be delivered to the subject to modulate the expression of mbII,-15. In another aspect, veledimex is provided at 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg or 100 mg. In a further aspect, lower doses of veledimex are provided, for example, 0.5 mg, 1 mg, 5 mg, 10 mg, 15 mg or 20 mg. In one embodiment, veledimex is administered to the subject 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 21 days prior to infusion of the modified immune effector cells. In a further embodiment, veledimex is administered about once every 12 hours, about once every 24 hours, about once every 36 hours or about once every48 hours, for an effective period of time to a subject post infusion of the modified immune effector cells. In one embodiment, an effective period of time for veledimex administration is about: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 days. In other embodiments, veledimex can be re-administered after a rest period, after a drug holiday or when the subject experiences a relapse.

0349In certain cases, where an adverse effect on a subject is observed or when treatment is not needed, the cell tag can be activated, for example via cetuximab, for conditional <i>in vivo</i> ablation of modified immune effector cells comprising cell tags such as truncated epidermal growth factor receptor tags as described herein.

0350In some embodiments, such immune effectors cells are modified by the constructs as described in <figref idref="f0002 f0003 f0004 f0005">FIG. 2A-2D</figref>, <figref idref="f0006">FIG. 3</figref>,<figref idref="f0029 f0030">FIG. 19A-19B</figref>, <figref idref="f0031">FIG. 20A</figref>, <figref idref="f0038">FIG. 22</figref>, <figref idref="f0040 f0041 f0042 f0043">FIG. 24A-24D</figref>, and <figref idref="f0044 f0045">FIG. 25A-25B</figref> through electroporation. In one instance, electroporation is performed with electroporators such as Lonza's Nucleofector^™ electroporators. In other embodiments, the vector comprising the above-mentioned constructs is a non-viral or viral vector. In one case, the non-viral vector includes a Sleeping Beauty transposon-transposase system. In one instance, the immune effector cells are electroporated using a specific sequence. For example, the immune effector cells can be electroporated with one transposon followed by the DNA encoding the transposase followed by a second transposon. In another instance, the immune effector cells can be electroporated with all transposons and transposase at the same time. In another instance, the immune effector cells can be electroporated with a transposase followed by both transposons or one transposon at a time. While undergoing sequential electroporation, the immune effector cells may be rested for a period of time prior to the next electroporation step.

0351In some cases, the modified immune effector cells do not undergo a propagation and activation step. In some cases, the modified immune effector cells do not undergo an incubation or culturing step (e.g. <i>ex vivo</i> propagation). In certain cases, the modified immune effector cells are placed in a buffer that includes IL-2 and II,21 prior to infusion. In other instances, the modified immune effector cells are placed or rested in cell culture buffer, for example in cell culture buffer (e.g. RPMI) supplemented with fetal bovine serum (FBS) prior to infusion. Prior to infusion, the modified immune effector cells can be harvested, washed and formulated in saline buffer in preparation for infusion into the subject.

0352In one instance, the subject has been lymphodepleted prior to infusion. In other instances, lymphodepletion is not required and the modified immune effector cells are rapidly infused into the subject. Exemplary lymphodepletion regimens are listed in <b>Tables 4 and 5</b> below: <tables id="tabl0004" num="0004"><table frame="all"><title><b>Table 4. Regimen 1</b></title><tgroup cols="2"><colspec colnum="1" colname="col1" colwidth="12mm" /><colspec colnum="2" colname="col2" colwidth="84mm" /><tbody><row><entry>D-6</entry><entry>Admit / IV Hydration</entry></row><row><entry>D-5</entry><entry>Fludarabine 25 mg/m2, Cyclophosphamide 250 mg/m2</entry></row><row><entry>D-4</entry><entry>Fludarabine 25 mg/m2, Cyclophosphamide 250 mg/m2</entry></row><row><entry>D-3</entry><entry>Fludarabine 25 mg/m2 IV, Cyclophosphamide 250 mg/m2</entry></row><row><entry>D-2</entry><entry>REST</entry></row><row><entry>D-1</entry><entry>REST</entry></row><row><entry>D0</entry><entry>T-cell infusion</entry></row></tbody></tgroup></table></tables><tables id="tabl0005" num="0005"><table frame="all"><title><b>Table 5. Regimen 2</b></title><tgroup cols="2"><colspec colnum="1" colname="col1" colwidth="12mm" /><colspec colnum="2" colname="col2" colwidth="84mm" /><tbody><row><entry>D-6</entry><entry>Admit / IV Hydration</entry></row><row><entry>D-5</entry><entry>Fludarabine 30 mg/m2, Cyclophosphamide 500 mg/m2</entry></row><row><entry>D-4</entry><entry>Fludarabine 30 mg/m2, Cyclophosphamide 500 mg/m2</entry></row><row><entry>D-3</entry><entry>Fludarabine 30 mg/m2 IV, Cyclophosphamide 500 mg/m2</entry></row><row><entry>D-2</entry><entry>REST</entry></row><row><entry>D-1</entry><entry>REST</entry></row><row><entry>D0</entry><entry>T-cell infusion</entry></row></tbody></tgroup></table></tables>

0353In a further instance, the subject undergoes minimal lymphodepletion. Minimal lymphodepletion herein refers to a reduced lymphodepletion protocol such that the subject can be infused within 1 day, 2 days or 3 days following the lymphodepletion regimen. In one instance, a reduced lymphodepletion protocol can include lower doses of fludarabine and/or cyclophosphamide. In another instance, a reduced lymphodepetion protocol can include a shortened period of lymphodepletion, for example 1 day or 2 days.

0354In one embodiment, the immune effector cells are modified by engineering/introducing a chimeric receptor and a cytokine into said immune effector cells and then rapidly infused into a subject. In other cases, the immune effector cells are modified by engineering/introducing a chimeric receptor and a cytokine into said cells and then infused within at least: 0, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 hours into a subject. In other cases, immune effector cells are modified by engineering/introducing a chimeric receptor and a cytokine into the immune effector cells and then infused in 0 days, &lt;1 day, &lt;2 days, &lt;3 days, &lt;4 days, &lt;5 days, &lt;6 days or &lt;7 days into a subject.

0355In some embodiments, an amount of modified effector cells is administered to a subject in need thereof and the amount is determined based on the efficacy and the potential of inducing a cytokine-associated toxicity. In another embodiment, the modified effector cells are CAR⁺ or TCR⁺ and CD3⁺ cells. In some cases, an amount of modified effector cells comprises about 10⁴ to about 10⁹ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁴ to about 10⁵ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁵ to about 10⁶ modified effector cells/kg. In some cases, an amount of modified effector cells comprises about 10⁶ to about 10⁷ modified effector cells/kg. In some cases, an amount of modified effector cells comprises >10⁴ but ≤ 10⁵ modified effector cells/kg. In some cases, an amount of modified effector cells comprises >10⁵ but ≤ 10⁶ modified effector cells/kg. In some cases, an amount of modified effector cells comprises >10⁶ but ≤ 10⁷ modified effector cells/kg.

0356In other embodiments, a method of stimulating the proliferation and/or survival of engineered cells comprises obtaining a sample of cells from a subject, and transfecting cells of the sample of cells with one or more polynucleotides that comprise one or more transposons. In an embodiment, the transposons encode a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of the cytokine and a transposase effective to integrate said one or more polynucleotides into the genome of said cells, to provide a population of engineered cells. In an embodiment, the gene switch polypeptides comprise i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain. In some embodiments, the first gene switch polypeptide and the second gene switch polypeptide are connected by a linker. In one instance, lymphodepletion is not required prior to administration of the engineered cells to a subject.

0357In one instance, a method of <i>in vivo</i> propagation of engineered cells comprises obtaining a sample of cells from a subject, and transfecting cells of the sample of cells with one or more polynucleotides that comprise one or more transposons. In an embodiment, the transposons encode a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of the cytokine and a transposase effective to integrate said one or more polynucleotides into the genome of said cells, to provide a population of engineered cells. In an embodiment, the gene switch polypeptides comprise i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain. In some embodiments, the first gene switch polypeptide and the second gene switch polypeptide are connected by a linker. In one instance, lymphodepletion is not required prior to administration of the engineered cells to a subject.

0358In another embodiment, a method of enhancing <i>in vivo</i> persistence of engineered cells in a subject in need thereof comprises obtaining a sample of cells from a subject, and transfecting cells of the sample of cells with one or more polynucleotides that comprise one or more transposons. In some cases, the transposons encode a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of the cytokine and a transposase effective to integrate the DNA into the genome of said cells, to provide a population of engineered cells. In some cases, the gene switch polypeptides comprise i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein the first gene switch polypeptide and the second gene switch polypeptide are connected by a linker. In one instance, lymphodepletion is not required prior to administration of the engineered cells to a subject.

0359In another embodiment, a method of treating a subject with a solid tumor comprises obtaining a sample of cells from a subject, transfecting cells of the sample with one or more polynucleotides that comprise one or more transposons, and administering the population of engineered cells to the subject. In one instance, lymphodepletion is not required prior to administration of the engineered cells to a subject. In some cases, the one or more transposons encode a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of the cytokine and a transposase effective to integrate the DNA into the genome of the cells. In some cases, the gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein the first gene switch polypeptide and second gene switch polypeptide are connected by a linker. In some cases, the cells are transfected via electroporation. In some cases, the polynucleotides encoding the gene switch polypeptides are modulated by a promoter. In some cases, the promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof. In some cases, the tissue-specific promoter comprises a T cell specific response element or an NFAT response element. In some cases, the cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant. In some cases, the cytokine is in secreted form. In some cases, the cytokine is in membrane-bound form. In some cases, the cells are NK cells, NKT cells, T-cells or T-cell progenitor cells. In some cases, the cells are administered to a subject (e.g. by infusing the subject with the engineered cells). In some cases, the method further comprises administering an effective amount of a ligand (e.g. veledimex) to induce expression of the cytokine. In some cases, the CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2. In some cases, the transposase is salmonid-type Tc1-like transposase. In some cases, the transposase is SB11 or SB100x transposase. In some cases, the cell tag comprise at least one of a HER1 truncated variant and a CD20 truncated variant.

Pharmaceutical Compositions and Dosage

0360In some embodiments, disclosed herein are compositions comprising a polynucleotide or polypeptide disclosed herein for administration in a subject. In some instances, are modified effector cell compositions encoding a polynucleotide or polypeptide disclosed herein, and optionally containing a cytokine and/or an additional therapeutic agent. In some instances, also included herein are vectors encoding gene-switch polypeptides for regulating expression of a chimeric antigen receptor for modification of an effector cell.

0361In some instances, pharmaceutical compositions of a modified effector cell or a vector encoding gene-switch polypeptides and a chimeric antigen receptor are formulated in a conventional manner using one or more physiologically acceptable carriers including excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically. Proper formulation is dependent upon the route of administration chosen. A summary of pharmaceutical compositions described herein is found, for example, in <nplcit id="ncit0058" npl-type="b"><text>Remington: The Science and Practice of Pharmacy, Nineteenth Ed (Easton, Pa.: Mack Publishing Company, 1995</text></nplcit>); <nplcit id="ncit0059" npl-type="b"><text>Hoover, John E., Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pennsylvania 1975</text></nplcit>; <nplcit id="ncit0060" npl-type="b"><text>Liberman, H.A. and Lachman, L., Eds., Pharmaceutical Dosage Forms, Marcel Decker, New York, N.Y., 1980</text></nplcit>; and <nplcit id="ncit0061" npl-type="b"><text>Pharmaceutical Dosage Forms and Drug Delivery Systems, Seventh Ed. (Lippincott Williams &amp; Wilkins1999</text></nplcit>).

0362Pharmaceutical compositions are optionally manufactured in a conventional manner, such as, by way of example only, by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or compression processes.

0363In certain embodiments, compositions may also include one or more pH adjusting agents or buffering agents, including acids such as acetic, boric, citric, lactic, phosphoric and hydrochloric acids; bases such as sodium hydroxide, sodium phosphate, sodium borate, sodium citrate, sodium acetate, sodium lactate and tris-hydroxymethylaminomethane; and buffers such as citrate/dextrose, sodium bicarbonate and ammonium chloride. Such acids, bases and buffers are included in an amount required to maintain pH of the composition in an acceptable range.

0364In other embodiments, compositions may also include one or more salts in an amount required to bring osmolality of the composition into an acceptable range. Such salts include those having sodium, potassium or ammonium cations and chloride, citrate, ascorbate, borate, phosphate, bicarbonate, sulfate, thiosulfate or bisulfite anions; suitable salts include sodium chloride, potassium chloride, sodium thiosulfate, sodium bisulfite and ammonium sulfate.

0365The pharmaceutical compositions described herein are administered by any suitable administration route, including but not limited to, oral, parenteral (<i>e.g.</i>, intravenous, subcutaneous, intramuscular, intracerebral, intracerebroventricular, intra-articular, intraperitoneal, or intracranial), intranasal, buccal, sublingual, or rectal administration routes. In some instances, the pharmaceutical composition is formulated for parenteral (<i>e.g</i>., intravenous, subcutaneous, intramuscular, intracerebral, intracerebroventricular, intra-articular, intraperitoneal, or intracranial) administration.

0366The pharmaceutical compositions described herein are formulated into any suitable dosage form, including but not limited to, aqueous oral dispersions, liquids, gels, syrups, elixirs, slurries, suspensions and the like, for oral ingestion by an individual to be treated, solid oral dosage forms, aerosols, controlled release formulations, fast melt formulations, effervescent formulations, lyophilized formulations, tablets, powders, pills, dragees, capsules, delayed release formulations, extended release formulations, pulsatile release formulations, multiparticulate formulations, and mixed immediate release and controlled release formulations. In some embodiments, the pharmaceutical compositions are formulated into capsules. In some embodiments, the pharmaceutical compositions are formulated into solutions (for example, for IV administration). In some cases, the pharmaceutical composition is formulated as an infusion. In some cases, the pharmaceutical composition is formulated as an injection.

0367The pharmaceutical solid dosage forms described herein optionally include a compound described herein and one or more pharmaceutically acceptable additives such as a compatible carrier, binder, filling agent, suspending agent, flavoring agent, sweetening agent, disintegrating agent, dispersing agent, surfactant, lubricant, colorant, diluent, solubilizer, moistening agent, plasticizer, stabilizer, penetration enhancer, wetting agent, anti-foaming agent, antioxidant, preservative, or one or more combination thereof.

0368In still other aspects, using standard coating procedures, such as those described in Remington's Pharmaceutical Sciences, 20th Edition (2000), a film coating is provided around the compositions. In some embodiments, the compositions are formulated into particles (for example for administration by capsule) and some or all of the particles are coated. In some embodiments, the compositions are formulated into particles (for example for administration by capsule) and some or all of the particles are microencapsulated. In some embodiments, the compositions are formulated into particles (for example for administration by capsule) and some or all of the particles are not microencapsulated and are uncoated.

0369In certain embodiments, compositions provided herein may also include one or more preservatives to inhibit microbial activity. Suitable preservatives include mercury-containing substances such as merfen and thiomersal; stabilized chlorine dioxide; and quaternary ammonium compounds such as benzalkonium chloride, cetyltrimethylammonium bromide and cetylpyridinium chloride.

0370"Proliferative disease" as referred to herein means a unifying concept that excessive proliferation of cells and turnover of cellular matrix contribute significantly to the pathogenesis of several diseases, including cancer is presented.

0371"Patient" or "subject" as used herein refers to a mammalian subject diagnosed with or suspected of having or developing a physiological condition, for instance a cancer or an autoimmune condition or an infection. In some embodiments, the term "patient" refers to a mammalian subject with a higher than average likelihood of developing cancer. Exemplary patients may be humans, apes, dogs, pigs, cattle, cats, horses, goats, sheep, rodents and other mammalians that can benefit from the therapies disclosed herein. Exemplary human patients can be male and/or female.

0372"Patient in need thereof" or "subject in need thereof" is referred to herein as a patient diagnosed with or suspected of having a disease or disorder, for instance, but not restricted to a proliferative disorder such as cancer. In some cases, a cancer is a solid tumor or a hematologic malignancy. In some instances, the cancer is a solid tumor. In other instances, the cancer is a hematologic malignancy. In some cases, the cancer is a metastatic cancer. In some cases, the cancer is a relapsed or refractory cancer. In some instances, the cancer is a solid tumor. Exemplary solid tumors include, but are not limited to, anal cancer; appendix cancer; bile duct cancer (<i>i.e</i>., cholangiocarcinoma); bladder cancer; brain tumor; breast cancer; cervical cancer; colon cancer; cancer of Unknown Primary (CUP); esophageal cancer; eye cancer; fallopian tube cancer; gastroenterological cancer; kidney cancer; liver cancer; lung cancer; medulloblastoma; melanoma; oral cancer; ovarian cancer; pancreatic cancer; parathyroid disease; penile cancer; pituitary tumor; prostate cancer; rectal cancer; skin cancer; stomach cancer; testicular cancer; throat cancer; thyroid cancer; uterine cancer; vaginal cancer; vulvar cancer; or glioblastoma. In some embodiments leukemia can be, for instance, acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), chronic lymphocytic leukemia (CLL) and chronic myeloid leukemia (CML).

0373"Administering" is referred to herein as providing the compositions of the present disclosure to a patient. By way of example and not limitation, composition administration, <i>e.g</i>., injection, may be performed by intravenous (i.v.) injection, sub-cutaneous (s.c.) injection, intradermal (i.d.) injection, intraperitoneal (i.p.) injection, or intramuscular (i.m.) injection. One or more such routes may be employed. Parenteral administration can be, for example, by bolus injection or by gradual perfusion over time. Alternatively, or concurrently, administration may be by the oral route. Additionally, administration may also be by surgical deposition of a bolus or pellet of cells, or positioning of a medical device. In an embodiment, a composition of the present disclosure may comprise engineered cells or host cells expressing nucleic acid sequences described herein, or a vector comprising at least one nucleic acid sequence described herein, in an amount that is effective to treat or prevent proliferative disorders. A pharmaceutical composition may comprise a target cell population as described herein, in combination with one or more pharmaceutically or physiologically acceptable carriers, diluents or excipients. Such compositions may comprise buffers such as neutral buffered saline, phosphate buffered saline and the like; carbohydrates such as glucose, mannose, sucrose or dextrans, mannitol; proteins; polypeptides or amino acids such as glycine; antioxidants; chelating agents such as EDTA or glutathione; adjuvants (<i>e.g</i>., aluminum hydroxide); and preservatives.

0374As used herein, the terms "treatment," "treating," and its grammatical equivalents refer to obtaining a desired pharmacologic and/or physiologic effect. In embodiments, the effect is therapeutic, <i>i.e</i>., the effect partially or completely cures a disease and/or adverse symptom attributable to the disease. To this end, the method described herein comprises administering a "therapeutically effective amount" of the composition comprising the host cells expressing the nucleic acid sequence described herein, or a vector comprising the nucleic acid sequences described herein.

0375The terms "therapeutically effective amount", "therapeutic amount", "immunologically effective amount", anti-tumor effective amount", "tumor inhibiting effective amount" or their grammatical equivalents refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired therapeutic result. The therapeutically effective amount may vary according to factors such as the disease state, age, sex, and weight of the individual and the ability of a composition described herein to elicit a desired response in the individual. The precise amount of the compositions of the present disclosure to be administered can be determined by a physician with consideration of individual differences in age, weight, tumor size, extent of infection or metastasis, and condition of the patient (subject).

0376Alternatively, the pharmacologic and/or physiologic effect of administration of one or more compositions described herein to a patient or a subject may be "prophylactic," <i>i.e</i>., the effect completely or partially prevents a disease or symptom thereof.

0377A "prophylactically effective amount" refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired prophylactic result (<i>e.g</i>., prevention of disease onset).

0378"Antifoaming agents" reduce foaming during processing which can result in coagulation of aqueous dispersions, bubbles in the finished film, or generally impair processing. Exemplary anti-foaming agents include silicon emulsions or sorbitan sesquoleate.

0379"Antioxidants" include, for example, butylated hydroxytoluene (BHT), sodium ascorbate, ascorbic acid, sodium metabisulfite and tocopherol. In certain embodiments, antioxidants enhance chemical stability where required.

0380Formulations described herein may benefit from antioxidants, metal chelating agents, thiol containing compounds and other general stabilizing agents. Examples of such stabilizing agents, include, but are not limited to: (a) about 0.5% to about 2% w/v glycerol, (b) about 0.1% to about 1% w/v methionine, (c) about 0.1% to about 2% w/v monothioglycerol, (d) about 1 mM to about 10 mM EDTA, (e) about 0.01% to about 2% w/v ascorbic acid, (f) 0.003% to about 0.02% w/v polysorbate 80, (g) 0.001% to about 0.05% w/v. polysorbate 20, (h) arginine, (i) heparin, (j) dextran sulfate, (k) cyclodextrins, (l) pentosan polysulfate and other heparinoids, (m) divalent cations such as magnesium and zinc; or (n) combinations thereof.

0381"Binders" impart cohesive qualities and include, <i>e.g</i>., alginic acid and salts thereof; cellulose derivatives such as carboxymethylcellulose, methylcellulose (<i>e.g</i>., Methocel^®), hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose (<i>e.g</i>., Klucel^®), ethylcellulose (<i>e.g</i>., Ethocel^®), and microcrystalline cellulose (<i>e.g</i>., Avicel^®); microcrystalline dextrose; amylose; magnesium aluminum silicate; polysaccharide acids; bentonites; gelatin; polyvinylpyrrolidone/vinyl acetate copolymer; crospovidone; povidone; starch; pregelatinized starch; tragacanth, dextrin, a sugar, such as sucrose (<i>e.g</i>., Dipac^®), glucose, dextrose, molasses, mannitol, sorbitol, xylitol (<i>e.g</i>., Xylitab^®), and lactose; a natural or synthetic gum such as acacia, tragacanth, ghatti gum, mucilage of isapol husks, polyvinylpyrrolidone (<i>e.g</i>., Polyvidone^® CL, Kollidon^® CL, Polyplasdone^® XL-10), larch arabogalactan, Veegum^®, polyethylene glycol, waxes, sodium alginate, and the like.

0382A "carrier" or "carrier materials" include any commonly used excipients in pharmaceutics and should be selected on the basis of compatibility with compounds disclosed herein, such as, compounds of ibrutinib and An anticancer agent, and the release profile properties of the desired dosage form. Exemplary carrier materials include, <i>e.g</i>., binders, suspending agents, disintegration agents, filling agents, surfactants, solubilizers, stabilizers, lubricants, wetting agents, diluents, and the like. "Pharmaceutically compatible carrier materials" may include, but are not limited to, acacia, gelatin, colloidal silicon dioxide, calcium glycerophosphate, calcium lactate, maltodextrin, glycerine, magnesium silicate, polyvinylpyrrollidone (PVP), cholesterol, cholesterol esters, sodium caseinate, soy lecithin, taurocholic acid, phosphotidylcholine, sodium chloride, tricalcium phosphate, dipotassium phosphate, cellulose and cellulose conjugates, sugars sodium stearoyl lactylate, carrageenan, monoglyceride, diglyceride, pregelatinized starch, and the like. See, <i>e.g</i>., <nplcit id="ncit0062" npl-type="b"><text>Remington: The Science and Practice of Pharmacy, Nineteenth Ed (Easton, Pa.: Mack Publishing Company, 1995</text></nplcit>); <nplcit id="ncit0063" npl-type="b"><text>Hoover, John E., Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pennsylvania 1975</text></nplcit>; <nplcit id="ncit0064" npl-type="b"><text>Liberman, H.A. and Lachman, L., Eds., Pharmaceutical Dosage Forms, Marcel Decker, New York, N.Y., 1980</text></nplcit>; and <nplcit id="ncit0065" npl-type="b"><text>Pharmaceutical Dosage Forms and Drug Delivery Systems, Seventh Ed. (Lippincott Williams &amp; Wilkins1999</text></nplcit>).

0383"Dispersing agents," and/or "viscosity modulating agents" include materials that control the diffusion and homogeneity of a drug through liquid media or a granulation method or blend method. In some embodiments, these agents also facilitate the effectiveness of a coating or eroding matrix. Exemplary diffusion facilitators/dispersing agents include, <i>e.g</i>., hydrophilic polymers, electrolytes, Tween ^® 60 or 80, PEG, polyvinylpyrrolidone (PVP; commercially known as Plasdone^®), and the carbohydrate-based dispersing agents such as, for example, hydroxypropyl celluloses (e.g., HPC, HPC-SL, and HPC-L), hydroxypropyl methylcelluloses (<i>e.g</i>., HPMC K100, HPMC K4M, HPMC K15M, and HPMC K100M), carboxymethylcellulose sodium, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose phthalate, hydroxypropylmethylcellulose acetate stearate (HPMCAS), noncrystalline cellulose, magnesium aluminum silicate, triethanolamine, polyvinyl alcohol (PVA), vinyl pyrrolidone/vinyl acetate copolymer (S630), 4-(1,1,3,3-tetramethylbutyl)-phenol polymer with ethylene oxide and formaldehyde (also known as tyloxapol), poloxamers (<i>e.g</i>., Pluronics F68^®, F88^®, and F108^®, which are block copolymers of ethylene oxide and propylene oxide); and poloxamines (<i>e.g</i>., Tetronic 908^®, also known as Poloxamine 908^®, which is a tetrafunctional block copolymer derived from sequential addition of propylene oxide and ethylene oxide to ethylenediamine (BASF Corporation, Parsippany, N.J.)), polyvinylpyrrolidone K12, polyvinylpyrrolidone K17, polyvinylpyrrolidone K25, or polyvinylpyrrolidone K30, polyvinylpyrrolidone/vinyl acetate copolymer (S-630), polyethylene glycol, <i>e.g</i>., the polyethylene glycol can have a molecular weight of about 300 to about 6000, or about 3350 to about 4000, or about 7000 to about 5400, sodium carboxymethylcellulose, methylcellulose, polysorbate-80, sodium alginate, gums, such as, <i>e.g</i>., gum tragacanth and gum acacia, guar gum, xanthans, including xanthan gum, sugars, cellulosics, such as, <i>e.g</i>., sodium carboxymethylcellulose, methylcellulose, sodium carboxymethylcellulose, polysorbate-80, sodium alginate, polyethoxylated sorbitan monolaurate, polyethoxylated sorbitan monolaurate, povidone, carbomers, polyvinyl alcohol (PVA), alginates, chitosans and combinations thereof. Plasticizers such as cellulose or triethyl cellulose can also be used as dispersing agents. Dispersing agents particularly useful in liposomal dispersions and self-emulsifying dispersions are dimyristoyl phosphatidyl choline, natural phosphatidyl choline from eggs, natural phosphatidyl glycerol from eggs, cholesterol and isopropyl myristate.

0384Combinations of one or more erosion facilitator with one or more diffusion facilitator can also be used in the present compositions.

0385The term "diluent" refers to chemical compounds that are used to dilute the compound of interest prior to delivery. Diluents can also be used to stabilize compounds because they can provide a more stable environment. Salts dissolved in buffered solutions (which also can provide pH control or maintenance) are utilized as diluents in the art, including, but not limited to a phosphate buffered saline solution. In certain embodiments, diluents increase bulk of the composition to facilitate compression or create sufficient bulk for homogenous blend for capsule filling. Such compounds include <i>e.g</i>., lactose, starch, mannitol, sorbitol, dextrose, microcrystalline cellulose such as Avicel^®; dibasic calcium phosphate, dicalcium phosphate dihydrate; tricalcium phosphate, calcium phosphate; anhydrous lactose, spray-dried lactose; pregelatinized starch, compressible sugar, such as Di-Pac^® (Amstar); mannitol, hydroxypropylmethylcellulose, hydroxypropylmethylcellulose acetate stearate, sucrose-based diluents, confectioner's sugar; monobasic calcium sulfate monohydrate, calcium sulfate dihydrate; calcium lactate trihydrate, dextrates; hydrolyzed cereal solids, amylose; powdered cellulose, calcium carbonate; glycine, kaolin; mannitol, sodium chloride; inositol, bentonite, and the like.

0386"Filling agents" include compounds such as lactose, calcium carbonate, calcium phosphate, dibasic calcium phosphate, calcium sulfate, microcrystalline cellulose, cellulose powder, dextrose, dextrates, dextran, starches, pregelatinized starch, sucrose, xylitol, lactitol, mannitol, sorbitol, sodium chloride, polyethylene glycol, and the like.

0387"Lubricants" and "glidants" are compounds that prevent, reduce or inhibit adhesion or friction of materials. Exemplary lubricants include, <i>e.g</i>., stearic acid, calcium hydroxide, talc, sodium stearyl fumerate, a hydrocarbon such as mineral oil, or hydrogenated vegetable oil such as hydrogenated soybean oil (Sterotex^®), higher fatty acids and their alkali-metal and alkaline earth metal salts, such as aluminum, calcium, magnesium, zinc, stearic acid, sodium stearates, glycerol, talc, waxes, Stearowet^®, boric acid, sodium benzoate, sodium acetate, sodium chloride, leucine, a polyethylene glycol (<i>e.g</i>., PEG-4000) or a methoxypolyethylene glycol such as Carbowax^™, sodium oleate, sodium benzoate, glyceryl behenate, polyethylene glycol, magnesium or sodium lauryl sulfate, colloidal silica such as Syloid^™, Cab-O-Sil^®, a starch such as corn starch, silicone oil, a surfactant, and the like.

0388"Plasticizers" are compounds used to soften the microencapsulation material or film coatings to make them less brittle. Suitable plasticizers include, <i>e.g</i>., polyethylene glycols such as PEG 300, PEG 400, PEG 600, PEG 1450, PEG 3350, and PEG 800, stearic acid, propylene glycol, oleic acid, triethyl cellulose and triacetin. In some embodiments, plasticizers can also function as dispersing agents or wetting agents.

0389"Solubilizers" include compounds such as triacetin, triethylcitrate, ethyl oleate, ethyl caprylate, sodium lauryl sulfate, sodium doccusate, vitamin E TPGS, dimethylacetamide, N-methylpyrrolidone, N-hydroxyethylpyrrolidone, polyvinylpyrrolidone, hydroxypropylmethyl cellulose, hydroxypropyl cyclodextrins, ethanol, n-butanol, isopropyl alcohol, cholesterol, bile salts, polyethylene glycol 200-600, glycofurol, transcutol, propylene glycol, and dimethyl isosorbide and the like.

0390"Stabilizers" include compounds such as any antioxidation agents, buffers, acids, preservatives and the like.

0391"Suspending agents" include compounds such as polyvinylpyrrolidone, <i>e.g</i>., polyvinylpyrrolidone K12, polyvinylpyrrolidone K17, polyvinylpyrrolidone K25, or polyvinylpyrrolidone K30, vinyl pyrrolidone/vinyl acetate copolymer (S630), polyethylene glycol, <i>e.g</i>., the polyethylene glycol can have a molecular weight of about 300 to about 6000, or about 3350 to about 4000, or about 7000 to about 5400, sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethylcellulose, hydroxymethylcellulose acetate stearate, polysorbate-80, hydroxyethylcellulose, sodium alginate, gums, such as, <i>e.g</i>., gum tragacanth and gum acacia, guar gum, xanthans, including xanthan gum, sugars, cellulosics, such as, <i>e.g</i>., sodium carboxymethylcellulose, methylcellulose, sodium carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, polysorbate-80, sodium alginate, polyethoxylated sorbitan monolaurate, polyethoxylated sorbitan monolaurate, povidone and the like.

0392"Surfactants" include compounds such as sodium lauryl sulfate, sodium docusate, Tween 60 or 80, triacetin, vitamin E TPGS, sorbitan monooleate, polyoxyethylene sorbitan monooleate, polysorbates, polaxomers, bile salts, glyceryl monostearate, copolymers of ethylene oxide and propylene oxide, <i>e.g</i>., Pluronic^® (BASF), and the like. Some other surfactants include polyoxyethylene fatty acid glycerides and vegetable oils, <i>e.g</i>., polyoxyethylene (60) hydrogenated castor oil; and polyoxyethylene alkylethers and alkylphenyl ethers, <i>e.g</i>., octoxynol 10, octoxynol 40. In some embodiments, surfactants may be included to enhance physical stability or for other purposes.

0393"Viscosity enhancing agents" include, <i>e.g</i>., methyl cellulose, xanthan gum, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, hydroxypropylmethyl cellulose acetate stearate, hydroxypropylmethyl cellulose phthalate, carbomer, polyvinyl alcohol, alginates, acacia, chitosans and combinations thereof.

0394"Wetting agents" include compounds such as oleic acid, glyceryl monostearate, sorbitan monooleate, sorbitan monolaurate, triethanolamine oleate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monolaurate, sodium docusate, sodium oleate, sodium lauryl sulfate, sodium doccusate, triacetin, Tween 80, vitamin E TPGS, ammonium salts and the like.

Kits/Article of Manufacture

0395Disclosed herein, in certain embodiments, are kits and articles of manufacture for use with one or more methods described herein. Such kits include a carrier, package, or container that is compartmentalized to receive one or more containers such as vials, tubes, and the like, each of the container(s) comprising one of the separate elements to be used in a method described herein. Suitable containers include, for example, bottles, vials, syringes, and test tubes. In one embodiment, the containers are formed from a variety of materials such as glass or plastic.

0396The articles of manufacture provided herein contain packaging materials. Examples of pharmaceutical packaging materials include, but are not limited to, blister packs, bottles, tubes, bags, containers, bottles, and any packaging material suitable for a selected formulation and intended mode of administration and treatment.

0397For example, the container(s) include CAR-T cells (<i>e.g</i>., CD19-specific CAR-T cells) encoding gene-switch polypeptides for regulated expression of CARs described herein, and optionally in addition with cytokines and/or chemotherapeutic agents disclosed herein. Such kits optionally include an identifying description or label or instructions relating to its use in the methods described herein.

0398A kit typically includes labels listing contents and/or instructions for use, and package inserts with instructions for use. A set of instructions will also typically be included.

0399In some embodiments, a label is on or associated with the container. In one embodiment, a label is on a container when letters, numbers or other characters forming the label are attached, molded or etched into the container itself; a label is associated with a container when it is present within a receptacle or carrier that also holds the container, <i>e.g</i>., as a package insert. In one embodiment, a label is used to indicate that the contents are to be used for a specific therapeutic application. The label also indicates directions for use of the contents, such as in the methods described herein.

EXAMPLES

0400These examples are provided for illustrative purposes only and not to limit the scope of the claims provided herein.

Example 1. Nucleofection of PBMC with SB Gene Switch System

0401Various DNA plasmids expressing a SB transposon system, <i>i.e.</i> SB11, membrane bound IL-15 (mbIL-15), and chimeric antigen receptor (CAR), were transfected to peripheral blood mononuclear cells (PBMC) via nucleofection to redirect T cell specificity (<figref idref="f0001"><b>Figure 1</b></figref>).

0402On day 0, 20 million PBMC were resuspended in 100 µL of Amaxa Human T cell Nucleofector solution (Cat. no. VPA-1002; Lonza, Basel, Switzerland) mixed with a total of 15 µg of transposons and 5 µg of transposase (SB11) and electroporated.

0403The following day (day 1) cells were counted, and CAR expression was measured by flow cytometry. CAR T Cells were stimulated with either γ-irradiated (100 Gy) or mitomycin C treated AaPCs at a 1:1 ratio. The AaPC cells used were K562-AaPC expressing CD19 antigen. Cultures were supplemented with IL-21 (30ng/ml) only for the first round of stimulation and subsequently with recombinant human IL-2 (50 IU/ml) and IL-21 (30 ng/ml) (Pepro Tech) for remaining stimulations. T cell cultures were phenotyped at the end of each stimulation cycle, which typically lasted 7 days. The cultures were phenotyped for CAR expression by multi-parameter flow cytometry utilizing either Protein L or anti-idiotype antibody that recognizes CD19-specific CAR. Cultures were also closely monitored for the outgrowth of NK cells (defined as CD3negCD56+ population) and were removed from the CAR T cell cultures when the percentage exceeded 10% of total cell populations using magnetic beads for specific for CD56 (Stem Cell Technologies and/or Miltenyi Biotec), according to the manufacturer's instructions.

Example 2. Flow Cytometry Analysis of ON-OFF SB Gene Switch System

0404CD19-specific T cells were generated from mononuclear cells (MNC) derived from PB or UCB using SB transposition to introduce the CAR followed by addition of AaPC to numerically expand the T cells in a CAR-dependent manner.

0405For flow cytometry analysis to assess expression of various markers and gene(s) of interest, cells were gently resuspended and cell number, and viability were measured using Trypan blue exclusion method with the Countess instrument. Cell diameter size was also recorded. 5×10⁵ cells for each for the samples were harvested at 330xg for 4 min at 10°C for antibody staining. Harvested cells were incubated on ice for at least 15 min with 10% human AB serum in HBSS. Antibody cocktails containing fluorescently conjugated antibodies included one or more of antibodies specific to CD4 (Clone RPA-T4), CD8 (Clone SK1), CD3 (Clone UCHT1), CD56, CD19-specific CAR (anti-idiotype antibody), IL-15, and IL-15Ra, in HBSS+0.1% BSA+2mM EDTA. The prepared antibody cocktails and associated fluorescence minus one/isotype control were added to stain the cell samples, and then the samples were incubated on ice for 30 min. The samples were then washed then with FACS buffer (HBSS + 0.5% BSA + 2mM EDTA) and stained with Fixable Viability Dye (eBiosciences) for 30 min on ice. Cells were washed with FACS buffer and then fixed with a 4% paraformaldehyde solution (BD Cytofix; BD Biosciences). All samples were run on a LSR II flow cytometer, a Fortessa X-20 flow cytometer (BD Biosciences) or iQue Screener Plus (Intellicyt) and data was analyzed using FlowJo V10 (TreeStar, Ashland, OR) or iQue Screener software.

0406For induction of expression using ligand (veledimex), AaPC stimulated CAR-T cells were harvested at 1×10⁶ cells/ml. Either veledimex or DMSO (to keep DMSO concentration constant in both cultures) was added to the cultures. Veledimex was used at a concentration of 20nM, 50nM, 100nM or as described. Cells were then cultured at 37°C in presence of veledimex or DMSO for 2-3 days. After 2-3 days in culture, 5×10⁵ cells for each for the samples were harvested at 330xg for 4 min at 10°C for antibody staining. Harvested cells were incubated on ice for at least 15 min with 10% human AB serum in HBSS. Antibody cocktails containing fluorescently conjugated antibodies included one of more of antibodies specific to CD4 (Clone RPA-T4), CD8 (Clone SK1), CD3 (Clone UCHT1), CD56, CD19-specific CAR (anti-idiotype antibody), IL-15, and IL-15Ra in HBSS+0.1% BSA+2mM EDTA. The prepared antibody cocktails and associated isotype control were added to stain the cell samples, and then the samples were incubated on ice for 30 min. The samples were then washed with FACS buffer (HBSS + 0.5% BSA + 2mM EDTA) and stained with Fixable Viability Dye (eBiosciences) for 30 min on ice. Cells were washed with FACS buffer and fixed with 4% paraformaldehyde solution (BD Cytofix; BD Biosciences). All samples were run on a LSR II flow cytometer, a Fortessa X-20 flow cytometer (BD Biosciences) or iQue Screener Plus (Intellicyt) and data was analyzed using FlowJo V10 (TreeStar, Ashland, OR) or iQue Screener software.

0407For veledimex ON-OFF-ON experiments, veledimex was first added at mentioned concentration (typically between 20-100 nM) to cell cultures for 2-3 days. An aliquot of cells was harvested and analyzed for expression (ON) of various proteins by flow cytometry as noted above. Remaining cell culture was then washed and resuspended in complete medium without veledimex and cultured for up to 5 days. Aliquots of cells were harvested and analyzed for expression (OFF) at times mentioned by flow cytometry as noted above. Remaining cell culture was then washed and resuspended with complete medium containing veledimex to turn the expression of target gene(s) back on. After 2-3 days in culture, aliquot of cells were harvested and analyzed for expression by flow cytometry.

Example 3. Survival Experiments

0408Multiple Sleeping Beauty transposon DNA plasmids encoding for RTS-membrane bound IL-15 (RTS-mbIL-15), CD19-specific chimeric antigen receptor (CD19 CAR) (Design 9, <figref idref="f0002 f0003 f0004 f0005">Fig. 2</figref>) were transfected into peripheral blood mononuclear cells (PBMC) along with plasmid DNA encoding for Sleeping Beauty transposase SB11 via nucleofection (<figref idref="f0001"><b>Figure 1</b></figref>). On day 0, 20 million PBMC were resuspended in 100 µL of Amaxa Human T cell Nucleofector solution (Cat. no. VPA-1002; Lonza, Basel, Switzerland) mixed with a total of 15 µg of transposons and 5 µg of transposase and nucleofected into cells. The following day (day 1) cells were counted, and CAR expression was measured using flow cytometry. Cells were stimulated with either γ-irradiated (100 Gy) or mitomycin C treated K562 based AaPCs expressing CD19 on their surface at a 1:1 ratio. Cultures were supplemented with IL-21 (30ng/ml) only for the first round of stimulation and subsequently with recombinant human IL-2 (50 IU/ml) and IL-21 (30 ng/ml) (Pepro Tech) for remaining stimulations. T cell cultures were phenotyped at the end of each stimulation cycle, which typically lasted 7 days. The cultures were phenotyped for CAR expression, utilizing anti-idiotype antibody staining to detect CD19-specific CAR-T cells by multi-parameter flow cytometry. Cultures were also closely monitored for the outgrowth of NK cells (defined as CD3negCD56+ population) and were removed from the CAR T cell cultures when the percentage exceeded 10% of total cell populations using magnetic beads for CD56 (Stem Cell Technologies and/or Miltenyi Biotec), according to the manufacturer's instructions.

0409To measure persistence of CD19-specific CAR-T cells co-expressing RTS-mbIL-15 upon withdrawal of cytokines (IL-2 and IL-21) from culture media, CAR-T cells were harvested and seeded in complete RPMI medium with or without IL-2 and IL-21, at the concentration of 1×10⁶ cells/ml in 6-well plates. Veledimex (50 nM final concentration) or DMSO control were added to the culture media. Culture medium was changed every 2-3 days and small aliquot of cells were harvested for flow analysis. Flow analysis was conducted to measure mbIL-15 expression as well as to measure the % of live cells in the culture in presence of absence of cytokines from media. Survival of CAR-T cells is shown in <figref idref="f0015"><b>Figure 12</b></figref> in presence and absence of cytokines. In absence of cytokines in culture, improved survival of CAR-T cells was seen when veledimex was added to induce mbII,-15 expression. When veledimex was not added (mbIL-15 expression was not induced), cells did not survive in <i>ex vivo</i> culture.

Example 4. Western Blotting

0410PBMC were nucleofected with plasmids of Sleeping Beauty system to express CD19-specific CAR under constitutive promoter (CD19 CAR alone), or CD19-specific CAR and mbIL-15 both under constitutive promoters (CD 19 CAR + constitutive-mbIL-15) or CD19-specific CAR under constitutive promoter and RTS-mbIL-15 (CD19 CAR + RTS-mbIL-15). Nucleofected cells were cultured in presence of AaPC as described in Example 1.

0411After four rounds of stimulations, cells were cultured in absence (CD19 CAR alone, CD19 CAR + constitutive-mbIL-15 and CD19 CAR + RTS-mbIL-15) or presence (CD19 CAR + RTS-mbIL-15) of veledimex for 2-3 days. Cell lysates were prepared for western blot analysis. Approximately 10µg lysate/lane of NuPAGE 10% Bis-Tris gel was loaded. Proteins were transferred from gel to a polyvinylidene fluoride (PVDF) membranes using the iBlot^® (Life Technologies) semi-dry transfer apparatus. Membrane was blocked using a 5% (w/v) powdered milk solution in a PBS+Tween-20 (PBST; 1X PBS + 0.05% Tween-20) solution stained with goat anti-human IL-15 (R&amp;D Systems) primary antibody and rabbit anti-goat IgG HRP (KPL Laboratories) secondary antibody. SuperSignal^™ West Pico Chemiluminescent Substrate (Thermo Fisher Scientific) for enhanced chemiluminescence (ECL) detection was utilized.

0412Image of the western blot were captured on the FluorChem^™ E Imager (ProteinSimple, San Jose, CA) system using the Digital Darkroom software and AlphaView^® software (ProteinSimple). <figref idref="f0020"><b>Figure 14</b></figref> shows image of western blot. mbIL-15 expression was not detected by western blot when veledimex was absent (CD19 CAR + RTS-mbIL-15), but strong expression of mbII,-15 was observed when veledimex was added to the culture. In CD19 CAR only negative control, no mbIL-15 expression was observed. In CD19 CAR + constitutive-mbIL-15 positive control, expression of mbII,-15 was detected.

Example 5. T Cell Activation and Ligand Specific Control of mbII,-15 Transgene Expression

0413<i>Sleeping Beauty</i> transposons were designed to stably express CD19-specific CAR, a cell tag as well as gene switch- controlled mbIL-15. Expression of one or both of gene switch components (<i>e.g</i>. VP16/RxR and Gal4/EcR) were performed under the control of a T cell activation specific promoter. In this example, a T cell activation dependent promoter generated by 6X NFAT response element fused to minimal IL-2 promoter (NFAT6-IL2 promoter) was utilized to drive expression of gene switch components- VP16-RxR and/or Gal4-EcR fusion proteins for conditional expression of mbIL-15. When components of the gene switch are under the control of NFAT6-IL2 promoter, expression of mbIL-15 requires two conditions to be met: 1) T cells are activated ; and 2) activator ligand, veledimex, to be present. SB transposons construct combinations shown in <figref idref="f0031"><b>Fig. 20A</b></figref> were transfected along with SB11 transposase in donor T cells.

0414On day 0, 10-20 million T cells were resuspended in 100 µL of Amaxa Human T cell Nucleofector solution (Cat. no. VPA-1002; Lonza, Basel, Switzerland) mixed with a total of 15 µg of transposon(s) and 5 µg of transposase (SB11) and electroporated.

0415The following day (day 1) cells were counted, and CAR expression was measured by flow cytometry. CAR-T Cells were selectively expanded <i>ex vivo</i> by successive rounds of stimulations every 7-10 days for up to 4 cycles with either γ-irradiated (100 Gy) or mitomycin C treated AaPCs at a 1:1 ratio. The AaPC cells used were K562-AaPC expressing CD19 antigen. Cultures were supplemented with IL-21 (30ng/ml) only for the first round of stimulation and subsequently with recombinant human IL-2 (50 IU/ml) and IL-21 (30 ng/ml) (Pepro Tech) for remaining stimulations.

0416For flow cytometry analysis to assess expression of various markers and gene(s) of interest cells were gently resuspended and cell number and viability were measured using Trypan blue exclusion method with the Countess instrument. Cell diameter size was also recorded. 5×10⁵ cells for each for the samples were harvested at 330xg for 4 min at 10°C for antibody staining. Harvested cells were incubated on ice for at least 15 min with 10% human AB serum in HBSS. Antibody cocktails containing fluorescently conjugated antibodies included one or more of antibodies specific to CD4, CD8, CD3, CD56, CD19-specific CAR (anti-idiotype antibody), IL-15 and/or IL-15Ra, in HBSS+0.1% BSA+2mM EDTA. The prepared antibody cocktails and associated fluorescence minus one/isotype control were added to stain the cell samples, and then the samples were incubated on ice for 30 min. The samples were then washed then with FACS buffer (HBSS + 0.5% BSA + 2mM EDTA) and stained with Fixable Viability Dye (eBiosciences) for 30 min on ice. Cells were washed with FACS buffer and then fixed with a 4% paraformaldehyde solution (BD Cytofix; BD Biosciences). All samples were run on a LSR II flow cytometer, a Fortessa X-20 flow cytometer (BD Biosciences) or iQue Screener Plus (Intellicyt) and data was analyzed using FlowJo V10 (TreeStar, Ashland, OR) or iQue Screener software.

0417To assess the impact of T cell activation on mbII,-15 expression, cells were kept in culture media for at least 7 days post last AaPC stimulation to test baseline (no stimulation) expression levels. T cells were activated using different doses of ConA (1 or 5 µg/mL) for 48 hours or PMA/Ionomycin for 24 hours prior to treatment with veledimex or DMSO.

0418Non-activated or activated CAR-T cells were harvested and either 100nM veledimex or DMSO (to keep DMSO concentration constant in both cultures) was added to the cultures. Cells were then cultured at 37°C in presence of veledimex or DMSO for at least 24 hours before flow cytometry analysis to measure transgene expression. CAR and mbIL-15 expression was quantified in either resting (<figref idref="f0032">Fig. 20B</figref>) or activated T cells in presence of absence of veledimex (<figref idref="f0033">Fig. 20C</figref>: ConA 1 µg/mL; ConA 5 µg/mL : <figref idref="f0034">Fig. 20D</figref>, PMA/Ionomycin: <figref idref="f0035">Fig. 20E</figref>).

0419<figref idref="f0032">Fig. 20B</figref> shows that in absence of T cell activation, only CAR-T cells that harbor transposons for expression of gene switch components (<i>e.g</i>. VP16/RxR and Gal4/EcR) under a constitutive promoter were able to express mbIL-15 in when veledimex was added to the culture. As shown in <figref idref="f0033 f0034 f0035">Figs. 20C through 20E</figref>, CAR-T cells harboring transposons for expression of one or more gene switch components under NFAT6-IL-2 promoter (constructs #3, 4 and 6) exhibited expression of mbIL-15 when veledimex was added to culture showing two conditions had to be met for inducible expression of mbIL-15 by CAR-T cells. Furthermore, levels of mbIL-15 expression in presence of veledimex at fixed concentration increased with level of T cells activation (<figref idref="f0033">Fig. 20C</figref> and <figref idref="f0034">Fig. 20D</figref>). Extremely low levels of mbIL-15 expression by flow cytometry were detected in absence of veledimex for all tested construct combinations. Consistent with the design of these ligand inducible switch systems, only CAR⁺ T cells were able to induce mbIL-15 in presence of veledimex.

Example 6. Expression of IL-12 Using Gene Switch System

0420<i>Sleeping Beauty</i> transposons were designed as depicted in <figref idref="f0038"><b>Fig. 22</b></figref> to stably express EGFRvIII-specific CAR, a cell tag and RTS-IL-12. Transposon plasmids were electroporated in several donor T cells as previously described. EGFRvIII-CAR-T cells were selectively expanded <i>ex vivo</i> by successive rounds of stimulations every 7-10 days for up to 4 cycles with either γ-irradiated or mitomycin C treated AaPC that served as "feeder cells" at 1:1 ratio in media supplemented with IL-2 and IL-21. The AaPC cells used were K562-AaPC expressing EGFRvIII antigen. <figref idref="f0046"><b>Fig. 26</b></figref> depicts CAR expression in T cells from multiple donors as the CAR+ T cells are selectively expanded <i>ex vivo.</i>

0421<u>Veledimex ON-OFF cycling experiments</u>: For each ON-OFF cycle, veledimex was first added (ON) at previously mentioned concentrations (typically between 20-100 nM) to cell cultures for 2-3 days. An aliquot of cells was harvested and analyzed for expression (ON) of various proteins by flow cytometry and/or ELISA at noted time points. Remaining cell culture was then washed and resuspended in complete medium without veledimex (OFF) and cultured for up to 5 days. Aliquots of cells were harvested and analyzed for expression (OFF) at times mentioned by flow cytometry and/or ELISA as noted above. Veledimex ON-OFF cycle(s) can be repeated again with remaining cell culture by repeating the process.

0422To assay IL-12 induction in EGFRvIII-CAR-T cells, Pan T-cells at 24h post nucleofection were treated with DMSO (control) or veledemix in the presence of AaPCs in media containing IL-21. After 48 hours post-nucleofection, culture supernatants were analyzed for IL-12 levels by ELISA.

0423<figref idref="f0047"><b>FIG. 27</b></figref> shows that treatment with veledimex induced IL-12 expression by T cells that were transfected with SB transposons to co-express both CAR and RTS-IL-12. CAR-T cells lacking RTS-IL-12 however, failed to produce IL-12 in culture supernatant. Treatment with DMSO control showed low background levels of IL-12 induction.

0424Furthermore, the ability of RTS-IL-12/CAR-T cells to produce inducible IL-12 was assessed in presence or absence of antigen specific stimulation. EGFRvIII-CAR/RTS-IL-12 T cells were expanded <i>ex vivo</i> by three successive rounds of stimulation with EGFRvIII⁺ AaPCs. Veledimex (100 nM) or DMSO (control) were added to the culture of EGFRvIII-CAR/RTS-IL-12 T cells in absence (<figref idref="f0048">Fig. 28A</figref>) or presence (<figref idref="f0049">Fig. 28B</figref>) of EGFRvIII⁺ AaPCs for 48 hours before analysis of IL-12 levels in culture supernatant. As shown in <figref idref="f0048">Fig. 28A</figref> and <figref idref="f0049">Fig. 28B</figref>, the ability of EGFRvIII-CAR/RTS-IL-12 T cells to express veledimex induced IL-12 is greatly enhanced in presence of EGFRvIII antigen specific stimulation with low background levels of IL-12 expression in absence of veledimex.

Example 7. Veledimex ON-OFF Cycling in EGFRvIII CAR Expressing Cells Using RTS Gene Switch System

0425The effect of repeated treatments and withdrawals of veledimex to EGFRvIII-CAR-T cells harboring an inducible IL-12 gene was determined <i>in vitro</i> both in the presence and absence of antigen specific T cell activation by co-culture with AaPCs. In the first cycle (ON-OFF) of ligand treatment, CAR-T cells (10⁶/ml) expanded <i>ex vivo</i> by four successive rounds of stimulation with EGFRvIII⁺ AaPCs were treated with DMSO or veledimex and cultured in the presence or absence of AaPCs in media containing IL-21 and IL-2. After 48 hours post-treatment, cells were washed thoroughly to remove ligand and cultured in a new culture vessel in media containing IL-21 and IL-2 for 5 days. Culture supernatants harvested between 24-120 hours post-treatment were then analyzed for expression of IL-12 and IFNγ.

0426In the second cycle (ON-OFF) of ligand treatment, CAR-T cells from cultures treated with DMSO or veledimex in the presence of AaPCs in cycle 1 were collected at 5 days after withdrawal of veledimex (in cycle 1) and subjected to a second cycle of ligand treatment with DMSO or veledimex in the presence or absence of antigen specific T cell activation by co-culture with AaPCs. After 48 hours post-treatment, cells were washed thoroughly to remove ligand and cultured in a new culture vessel in media containing IL-21 plus IL-2 for 5 days. Culture supernatants harvested between 24-120 hours post-treatment were then analyzed for expression of IL-12 and IFNγ.

0427FIG. 29A shows that treatment with veledimex in EGFRvIII-CAR-T cells also harboring inducible IL-12 constructs (XON-61 or XON-62; SEQ ID NO 135 or 136) results in an increase in IL-12 expression relative to treatment with DMSO in culture supernatants at 48h post-treatment. Levels of IL-12 induction were enhanced in the presence of AaPC-mediated antigen-specific stimulation compared to the absence of antigen-specific stimulation. Very low background levels of IL-12 expression were observed in absence of veledimex in presence or absence of antigen specific stimulation. EGFRvIII-CAR-T cells without inducible IL-12 failed to express any IL-12 in presence or absence of antigen specific stimulation.

0428The effect of withdrawing veledimex on IL-12 expression is shown in <figref idref="f0051"><b>FIG. 30A</b></figref> (cells cultured in the absence of AaPCs) and <figref idref="f0052"><b>FIG. 30B</b></figref> (cells cultured in the presence of AaPCs). In both the presence and absence of AaPC-mediated antigen-specific stimulation, withdrawal of veledimex at 48h-post-treatment resulted in a reduction of IL-12 expression. Levels of IL-12 induction were significantly lower in the absence of antigen-specific stimulation (<figref idref="f0051">FIG. 30A</figref>) compared to in the presence of antigen-specific stimulation (<figref idref="f0052"><b>FIG. 30B</b></figref>). But levels of IL-12 gradually reduced back to the baseline levels upon withdrawal of veledimex exhibiting tight control of inducible gene expression.

0429<figref idref="f0053"><b>FIG. 31A</b></figref> and <figref idref="f0054"><b>FIG. 31B</b></figref> show levels of IL-12 induction in culture supernatants at 48h post-ligand treatment during a second cycle with veledimex or DMSO following withdrawal of the agents during cycle 1. DMSO or veledimex treated cells cultured in the presence of EGFRvIII-expressing AaPCs in cycle 1 were treated with veledimex (or DMSO) in cycle 2 in the presence or absence of EGFRvII⁺aAaPCs. Results show that cells treated with veledimex and EGFRvIII⁺ AaPCs in cycle 2 show increased IL-12 induction when they were treated with veledimex and EGFRvIII⁺- AaPCs during cycle 1 (<figref idref="f0054"><b>FIG. 31B</b></figref>) relative to cells treated with DMSO and EGFRvIII⁺ AaPCs during cycle 1 (<figref idref="f0053"><b>FIG. 31A</b></figref>). Again very low background levels of IL-12 expression were observed in absence of veledimex.

0430Kinetics of RTS- IL-12 expression upon two cycles of treatment with veledimex is captured in <figref idref="f0055"><b>FIG. 32A</b></figref><b>.</b> EGFRvIII-CAR-T cells harboring inducible IL-12 constructs (XON-61 or XON-62; SEQ ID NO 135 or 136) were evaluated for their ability to induce IL-12 expression in presence of absence of veledimex by two cycles of ligand treatment as described above. Ligand inducible gene switch vectors in this example are designed such that only cells that express both transposons are capable of gene switch controlled expression of IL-12. Expression of EGFRvIII CAR was quantified by flow cytometry in T cells prior to start of cycle 1 of ligand treatment as shown in <figref idref="f0057">Fig. 34B</figref>. Cells were gated on CD3.

0431As shown in <figref idref="f0055"><b>FIG. 32A</b></figref><b>,</b> IL-12 expression by these CAR-T cells can be turned ON and OFF repeatedly by addition or withdrawal of activator ligand veledimex during prolonged culture period. IL-12 expression went down to baseline levels upon withdrawal of veledimex and can be turned back on upon addition of veledimex.The data is representative from one donor.

0432<figref idref="f0056"><b>FIG. 33</b></figref> shows another example of kinetics of RTS-IL-12 expression upon two cycles of treatment with veledimex. EGFRvIII-CAR-T cells harboring inducible IL-12 constructs (XON-61 or XON-62; SEQ ID NO 135 or 136) were evaluated for their ability to induce IL-12 expression in presence of absence of veledimex by two cycles of ligand treatment as described above. In this case, the first treatment cycle was carried out in the presence of EGFRvIII⁺ AaPCs and the second cycle was in the absence of EGFRvIII⁺AaPCs. Consistent with previous finding, veledimex can regulate IL-12 expression by EGFRvIII-CAR-T cells upon repeated treatment and withdrawal during prolonged culture period. Removal of AaPC-mediated EGFRvIII-specific stimulation during cycle 2 leads to a corresponding reduction of IL-12 levels. The data is representative from a second donor.

Example 8. Veledimex dose-response

0433EGFRvIII-CAR T cells with or without RTS-IL-12 were expanded <i>ex vivo</i> by three successive rounds of stimulation with EGFRvIII⁺ AaPCs. T cells were then treated with varying doses of veledimex from 0 nM (DMSO control) to 100 nM. At 48h post veledimex treatment, culture supernatants were harvested analyzed for IL-12 levels by ELISA. EGFRvIII-CAR expression in all groups was confirmed with flow cytometry and was stable with increasing doses of veledimex (data not shown) as expected with CAR expression under control of a constitutive promoter.

0434Results are shown in <figref idref="f0057"><b>FIG. 34</b></figref><b>.</b> Results show that, EGFRvIII-CAR/RTS-IL-12 T cells produced IL-12 in veledimex dose dependent manner. Lower levels of IL-12 expression was observed for a given veledimex concentration in cells transfected with transposons that express a cell tag in addition to CAR and IL-12 compared to cells lacking cell tag expression. EGFRvIII-CAR-T cells without RTS-IL-12 failed to express IL-12.

Example 9. Specific cytotoxicity of EGFRvIII-CAR-T cells towards EGFRvIII⁺ target cells

0435The ability of T-cells expressing EGFRvIII-CAR to respond to EGFRvIII⁺ target cells was tested. EGFRvIII-CAR T cells with or without RTS-IL-12 were expanded <i>ex vivo</i> by four successive rounds of stimulation with EGFRvIII⁺ AaPCs. These effector EGFRvIII-CAR-T cells were rested for 48h in RPMI containing 2% FBS and L-glutamine prior to co-culture with EGFRvIII⁺ and EGFRvIII^neg target cells at a 1:1 effector to target cell ratio in absence of veledimex. Culture supernatants were collected at 24h post-culture and analyzed for IFNγ as a functional readout of specificity of EGFRvIII-CAR-T cells.

0436<figref idref="f0058"><b>FIG. 35</b></figref> shows EGFRvIII antigen specific IFNγ production by CAR-T cells at 24h post co-culture with target cells. Co-culture with EGFRvIII^negEL4 cell line or effector CAR-T cells alone did not result in IFNγ expression.

0437<figref idref="f0059"><b>FIG. 36A</b></figref> shows IFNγ in culture supernatants at 24h post co-culture with EGFRvIII-expressing Glioblastoma target cells (no veledimex). Results show that EGFRvIII⁺ Glioblastoma target cells (U251MG-EGFRvIII-Fluc-GFP and U87MG-EGFRvIII-Fluc-GFP) induced IFNγ secretion by EGFRvIII-CAR T-cells while EGFRvIII^neg target cells (U251MG, U251MG-EGFRvIII-Fluc-GFP, U87MG, and U87MG-Fluc-GFP) or effector cells alone failed to induce IFNγ secretion.

0438Cytotoxicity of EGFRvII-CAR-T cells towards EGFRvIII⁺ and EGFRvIII^neg target cells was tested in a 2 hr Europium release assay. Target cell lines were labeled using the DELFIA BATDA reagent (DELFIA EuTDA Cytotoxicity assay; Perkin Elmer). EGFRvIII-CAR-T effector (E) cells were co-cultured with labeled target (T) cells at (E:T) ratios of 3:1, 1:1 or 0.3:1 in RPMI-1640 + 5% heat-inactivated FBS. After 2 hr, supernatant from the co-cultures were harvested and developed with addition of the DELFIA Europium assay and read on a time-resolved fluorescence instrument to measure cytotoxicity of target cells. The results from example experiments are depicted in <figref idref="f0060">Fig. 36B</figref>.

0439As shown in <figref idref="f0060">Fig. 36B</figref>, EGFRvIII-CAR-T cells with or without RTS-IL-12 showed EGFRvIII antigen specific, dose-dependent cytotoxicity of target cells.

Example 10. Nucleofection of PBMCs with Serine Recombinase System

0440Various DNA plasmids containing serine recombinase attachment sites and components of the gene switch system as depicted in <figref idref="f0025">Figure 17</figref> were transfected to peripheral blood mononuclear cells (PBMC) via nucleofection to redirect T cell specificity. Specifically, 3 single vectors were tested in the presence and absence of a serine recombinase, SF370: <ol id="ol0001" compact="compact"><li>(i) CAR:HER1t + constitutive mbIL15 (positive control)</li><li>(ii) CAR:HER1t + promoterless mbIL15 (negative control)</li><li>(iii) CAR:HER1t + RTS:mbIL15</li></ol> The expression of the CAR and mbIL15 was evaluated weekly (at days 1, day 8, day 15 and day 22). Aliquots of cells were treated with either DMSO or veledimex 24-48h prior to each flow to assess inducible mbIL15 expression. AaPC Clone 1 was added weekly at a 1:1 ratio with CAR+ cells.

0441Only cells receiving the CAR/mbIL15 vector construct + SF370 recombinase were observed to expand; all other cultures failed to expand within a week despite similar transfection efficiencies. This result is indicative of recombinase-mediated integration of the test construct. HER1t expression was only evaluated on days 22 &amp; 29 and correlates well with CAR expression (data not shown).

0442Two weeks post-transfection, veledimex treatment (~48h) was associated with an induction of mbII,-15 expression. In the absence of veledimex, mbII,-15 expression is in the range with the negative control "promoterless mbIL15" sample. Removal of veledimex was associated with complete loss of mbIL15 expression.

0443While preferred embodiments of the present disclosure have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions will now occur to those skilled in the art without departing from the present disclosure. It should be understood that various alternatives to the embodiments described herein, or combinations of one or more of these embodiments or aspects described therein may be employed in practicing the present disclosure. It is intended that the following claims define the scope of the present disclosure and that methods and structures within the scope of these claims and their equivalents be covered thereby. In view of the foregoing, it will be appreciated that the invention described herein inter alia relates to the following items: <ol id="ol0002" compact="compact"><li>1. A composition that comprises a polynucleotide encoding gene switch polypeptides for ligand-inducible control of heterologous gene expression, wherein said gene switch polypeptides comprise: <ol id="ol0003"><li>a) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and</li><li>b) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain,</li></ol> wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.</li><li>2. A composition that comprises one or more polynucleotides encoding a gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises: <ol id="ol0004" compact="compact"><li>a) a first gene switch polypeptide that comprises a transactivation domain;</li><li>b) a second gene switch polypeptide that comprises a DNA binding domain fused to a ligand binding domain; and</li><li>c) at least one heterologous gene polypeptide;</li></ol> wherein one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide is connected by a polypeptide linker to another one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide; and wherein said polypeptide linker comprises a cleavable linker or ribosome skipping linker sequence.</li><li>3. The composition of item 1 or 2, wherein said DNA binding domain comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD.</li><li>4. The composition of any one of items 1-3, wherein said DNA binding domain has a sequence as shown in SEQ ID NO: 184.</li><li>5. The composition of any one of items 1-4, wherein said transactivation domain comprises at least one of a VP16 transactivation domain and a B42 acidic activator transactivation domain.</li><li>6. The composition of any one of items 1-5, wherein said transactivation domain has a sequence as shown in SEQ ID NO: 181.</li><li>7. The composition of any one of items 1-6, wherein at least one of said first nuclear receptor ligand binding domain, said second nuclear receptor ligand binding domain, and said ligand binding domain comprises at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, a NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor.</li><li>8. The composition of any one of items 1-7, wherein at least one of said first nuclear receptor ligand binding domain, said second nuclear receptor ligand binding domain, and said ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186.</li><li>9. The composition of item 1, wherein said first gene switch polypeptide comprises a GAL4 DBD fused to an EcR nuclear receptor ligand binding domain, and said second gene switch polypeptide comprises a VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain.</li><li>10. The composition of item 9, wherein said Gal4 DBD fused to said EcR nuclear receptor ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186 or 187-188and said VP16 transactivation domain fused to said retinoid receptor X (RXR) nuclear receptor ligand binding domain has a sequence as shown in SEQ ID NO: 183.</li><li>11. The composition of item 1, wherein said linker is a cleavable linker, a ribosome skipping linker sequence or an IRES linker.</li><li>12. The composition of item 11, wherein said linker is an IRES linker and said IRES linker has a sequence as shown in any one of SEQ ID NOs: 18-19.</li><li>13. The composition of item 11, wherein said linker is a cleavable linker or a ribosome skipping linker sequence.</li><li>14. The composition of item 2 or 13, wherein said cleavable linker or said ribosome skipping linker sequence comprises one or more of a 2A linker, p2A linker, T2A linker, F2A linker, E2A linker, GSG-2A linker, GSG linker, SGSG linker, furinlink linker variants and derivatives thereof.</li><li>15. The composition of item 2 or 13, wherein said cleavable linker or said ribosome skipping linker sequence has a sequence as shown in any one of SEQ ID NOs: 146-162.</li><li>16. The composition of any one of items 1-15, wherein said polynucleotide or said one or more polynucleotides further encodes an antigen-binding polypeptide.</li><li>17. The composition of item 16, wherein said antigen-binding polypeptide comprises at least one of a chimeric antigen receptor (CAR) and a T-cell receptor.</li><li>18. The composition of item 17, wherein said antigen-binding polypeptide comprises a CAR and said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MUC-16, MAGE-A1, , h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.</li><li>19. The composition of item 17, wherein said antigen-binding polypeptide comprises a CAR and said CAR has a sequence as shown in any one of SEQ ID NOs: 210-244.</li><li>20. The composition of any one of items 16-19, wherein said polynucleotide or said one or more polynucleotides further encodes a cell tag.</li><li>21. The composition of item 20, wherein said cell tag comprises at least one of a HER1 truncated variant or a CD20 truncated variant.</li><li>22. The composition of item 20, wherein said cell tag has a sequence as shown in any one of SEQ ID NOs: 189-202.</li><li>23. The composition of item 20, wherein expression of at least one of said first gene switch polypeptide, said second gene switch polypeptide, said antigen-binding polypeptide, and said cell tag is modulated by a promoter, wherein said promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof.</li><li>24. The composition of item 23, wherein said promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60.</li><li>25. The composition of item 23, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises a T-cell-specific response element.</li><li>26. The composition of item 25, wherein said tissue-specific promoter comprises one or more NFAT response element(s).</li><li>27. The composition of item 26, wherein said NFAT response element has a sequence as shown in any one of SEQ ID NOs: 51-57.</li><li>28. The composition of item 1, wherein said composition further comprises a second polynucleotide encoding a heterologous gene polypeptide.</li><li>29. The composition of item 2 or 28, wherein said heterologous gene polypeptide comprises at least one of a cytokine, a cell tag, and a chimeric antigen receptor (CAR).</li><li>30. The composition of item 29, wherein said cytokine comprises a cytokine and said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.</li><li>31. The composition of item 30, wherein said cytokine is in secreted form.</li><li>32. The composition of item 30, wherein said cytokine is in membrane-bound form.</li><li>33. The composition of any one of items 30-32, wherein said cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209.</li><li>34. The composition of any one of items 2 and 28-33, wherein expression of said at least one heterologous gene polypeptide is modulated by an inducible promoter.</li><li>35. The composition of item 33, wherein said inducible promoter has a sequence as shown in any of SEQ ID NOs: 40-64.</li><li>36. The composition of item 34 or 35, wherein said inducible promoter is modulated by at least one of said first gene switch polypeptide and said second gene switch polypeptide.</li><li>37. A vector comprising said polynucleotide of item 1 or at least one of said one or more polynucleotides of item 2.</li><li>38. The vector of item 37, wherein said vector is a lentivirus vector, a retroviral vector, or a non-viral vector.</li><li>39. The vector of item 38, wherein said non-viral vector is a Sleeping Beauty transposon.</li><li>40. A method of regulating the expression of a heterologous gene in an effector cell, the method comprising: <ul id="ul0002" list-style="none" compact="compact"><li>introducing into said effector cell one or more polynucleotides that encode (i) a first gene switch polypeptide that comprises a DNA-binding domain fused to a ligand binding domain, (ii) a second gene switch polypeptide that comprises a transactivation domain, (iii) a heterologous gene polypeptide encoded by said heterologous gene and (iv) a polypeptide linker that comprises a cleavable or ribosome skipping linker sequence, wherein said polypeptide linker connects one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide to another one of said first gene switch polypeptide, said second gene switch polypeptide and said heterologous gene polypeptide; and</li><li>contacting said effector cell with a ligand in an amount sufficient to induce expression of said heterologous gene.</li></ul></li><li>41. The method of item 40, wherein at least one of said one or more polynucleotides further encodes an antigen-binding polypeptide.</li><li>42. The method of item 41, wherein said antigen-binding polypeptide selectively binds a predetermined cell surface protein of a target cell.</li><li>43. The method of item 42, wherein said target cell is a mammalian cell.</li><li>44. The method of item 42 or 43, wherein said target cell is a tumor cell.</li><li>45. The method of item 44, wherein said predetermined cell surface protein is a tumor antigen.</li><li>46. The method of any one of items 42-45, wherein said antigen-binding polypeptide selectively binds said predetermined cell surface protein of said target cell prior to said contacting said effector cell with said ligand.</li><li>47. The method of item 46, wherein said effector cell is exposed to said predetermined cell surface protein of said target cell for at least 7 days prior to said contacting said effector cell with said ligand.</li><li>48. The method of any one of items 42-47, wherein binding of said predetermined cell surface protein by said antigen-binding polypeptide activates said effector cell.</li><li>49. The method of any one of items 38-48, wherein said antigen-binding polypeptide comprises at least one of a chimeric antigen receptor (CAR) and a T-cell receptor.</li><li>50. The method of item 49, wherein said antigen-binding polypeptide comprises a CAR and said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.</li><li>51. The method of item 49, wherein said antigen-binding polypeptide comprises a CAR and said CAR has a sequence as shown in any one of SEQ ID NOs: 210-244.</li><li>52. The method of any one of items 38-51, wherein said heterologous gene polypeptide comprises said antigen-binding polypeptide.</li><li>53. The method of any one of items 37-52, wherein at least one of said one or more polynucleotides further encodes a cell tag.</li><li>54. The method of item 53, wherein said cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant.</li><li>55. The method of item 53, wherein said cell tag has a sequence as shown in any one of SEQ ID NOs: 189-202.</li><li>56. The method of any one of items 53-55, wherein said heterologous gene polypeptide comprises said cell tag.</li><li>57. The method of any one of items 37-56, wherein at least one of said one or more polynucleotides further encodes a cytokine.</li><li>58. The method of item 57, wherein said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.</li><li>59. The method of item 58, wherein said cytokine is in secreted form.</li><li>60. The method of item 58, wherein said cytokine is in membrane-bound form.</li><li>61. The method of any one of items 57-60, wherein said cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209.</li><li>62. The method of any one of items 57-61, wherein said heterologous gene polypeptide comprises said cytokine.</li><li>63. The method of any one of items 37-62, wherein expression of said heterologous gene polypeptide is modulated by an inducible promoter.</li><li>64. The method of item 63, wherein said inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64.</li><li>65. The method of any one of items 37-64, wherein said DNA-binding domain comprises at least one of GAL4 (GAL4 DBD), a LexA DBD, a transcription factor DBD, a steroid/thyroid hormone nuclear receptor superfamily member DBD, a bacterial LacZ DBD, and a yeast DBD.</li><li>66. The method of item 64, wherein said DNA binding domain has a sequence as shown in SEQ ID NO: 184.</li><li>67. The method of any one of items 37-66, wherein said transactivation domain comprises at least one of a VP16 transactivation domain, and a B42 acidic activator transactivation domain.</li><li>68. The method of item 67, wherein said transactivation domain has a sequence as shown in SEQ ID NO: 181.</li><li>69. The method of any one of items 37-68, wherein at least one of said first and second gene switch polypeptides further comprises a response element capable of binding to said DNA-binding domain.</li><li>70. The method of any one of items 37-69, wherein said ligand binding domain comprises at least one of an ecdysone receptor (EcR), a ubiquitous receptor, an orphan receptor 1, an NER-1, a steroid hormone nuclear receptor 1, a retinoid X receptor interacting protein-15, a liver X receptor β, a steroid hormone receptor like protein, a liver X receptor, a liver X receptor α, a farnesoid X receptor, a receptor interacting protein 14, and a farnesol receptor.</li><li>71. The method of item 70, wherein said ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186.</li><li>72. The method of any one of items 37-71, wherein said first gene switch polypeptide comprises a GAL4 DBD fused to an EcR nuclear receptor ligand binding domain, and said second gene switch polypeptide comprises a VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain.</li><li>73. The method of item 72, wherein said Gal4 DBD fused to an EcR has a sequence as shown in any one of SEQ ID NOs: 185-186 and said VP16 transactivation domain fused to a retinoid receptor X (RXR) nuclear receptor ligand binding domain has a sequence as shown in SEQ ID NO: 183.</li><li>74. The method of any one of items 37-73, wherein said ligand comprises at least one of: <ul id="ul0003" list-style="none" compact="compact"><li>(2S,3R,5R,9R,10R,13R,14S,17R)-17- [(2S,3R)-3,6-dihydroxy-6-methylheptan- 2-yl]-2,3,14-trihydroxy-10,13-dimethyl- 2,3,4,5,9,11,12,15,16,17-decahydro- 1H-cyclopenta[a]phenanthren-6-one;</li><li>N'-(3,5-Dimethylbenzoyl)-N'-[(3R)-2,2-dimethyl-3-hexanyl]-2-ethyl-3-methoxybenzohydrazide;</li><li>5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide;</li><li>5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methylbenzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide;</li><li>5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide;</li><li>5-Methyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide;</li><li>5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethyl-benzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide;</li><li>5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(3,5-dimethoxy-4-methylbenzoyl)-N'-(1-ethyl-2,2-dimethyl-propyl)-hydrazide;</li><li>5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethyl-benzoyl)-hydrazide;</li><li>5-Ethyl-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid N'-(1-tert-butyl-butyl)-N'-(3,5-dimethoxy-4-methyl-benzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methylbenzoyl)-hydrazide;</li><li>3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide;</li><li>3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(3-methoxy-2-methylbenzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxybenzoyl)-hydrazide;</li><li>3,5-Dimethoxy-4-methyl-benzoic acid N-(1-ethyl-2,2-dimethyl-propyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxy-benzoyl)-hydrazide;</li><li>3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-butyl)-N'-(2-ethyl-3-methoxybenzoyl)-hydrazide;</li><li>2-Methoxy-nicotinic acid N-(1-tert-butyl-pentyl)-N'-(4-ethyl-benzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(2,2-dimethyl-1-phenyl-propyl)-N'-(4-ethyl-benzoyl)-hydrazide;</li><li>3,5-Dimethyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methyl-benzoyl)-hydrazide; and</li><li>3,5-Dimethoxy-4-methyl-benzoic acid N-(1-tert-butyl-pentyl)-N'-(3-methoxy-2-methylbenzoyl)-hydrazide.</li></ul></li><li>75. The method of any one of items 37-74, wherein said expression of said heterologous gene is reduced or eliminated in the absence of said ligand, as compared to the expression in the presence of said ligand.</li><li>76. The method of item 75, wherein said expression of said heterologous gene is restored by providing additional amounts of said ligand.</li><li>77. The method of any one of items 37-76, wherein expression of at least one of said first gene switch polypeptide and said second gene switch polypeptide is modulated by a promoter, wherein said promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof.</li><li>78. The method of item 77, wherein said promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60.</li><li>79. The method of item 77, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises a T-cell-specific response element.</li><li>80. The method of item 79, wherein said tissue-specific promoter comprises one or more NFAT response element(s).</li><li>81. The method of item 80, wherein said NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57.</li><li>82. The method of any one of items 40-81, wherein said one or more polynucleotides is comprised within a vector.</li><li>83. The method of item 82, wherein said vector is a lentivirus vector, a retroviral vector, or a non-viral vector.</li><li>84. The method of item 83, wherein said non-viral vector is a Sleeping Beauty transposon.</li><li>85. A gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises one or more expression cassettes, wherein said one or more expression cassettes comprise: <ol id="ol0005" compact="compact"><li>a) a sequence encoding a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain;</li><li>b) a sequence encoding a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain;</li></ol> wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a polypeptide linker.</li><li>86. A gene switch system for ligand-inducible control of heterologous gene expression, wherein said gene switch system comprises one or more expression cassettes, wherein said one or more expression cassettes comprise: <ol id="ol0006" compact="compact"><li>a) a sequence encoding a first gene switch polypeptide that comprises a transactivation domain;</li><li>b) a sequence encoding a second gene switch polypeptide that comprises a DNA binding domain fused to a ligand binding domain; and</li><li>c) a sequence encoding a heterologous gene polypeptide;</li></ol> wherein one of said transactivation domain, DNA binding domain fused to said ligand binding domain, and said heterologous gene polypeptide is connected by a polypeptide linker to another of said transactivation domain, DNA binding domain fused to said ligand binding domain, and said heterologous gene polypeptide, and wherein said polypeptide linker comprises a cleavable or ribosome skipping linker sequence.</li><li>87. The gene switch system of item 85, wherein said one or more expression cassettes further comprise a sequence encoding a heterologous gene polypeptide.</li><li>88. The gene switch system of any one of items 85-87, wherein said one or more expression cassettes further comprise one or more of the following: <ol id="ol0007" compact="compact"><li>a) one or more recombinase attachment sites; and</li><li>b) a sequence encoding a serine recombinase.</li></ol></li><li>89. The gene switch system of any one of items 85-88, wherein said one or more expression cassettes further comprise one or more of the following: <ol id="ol0008" compact="compact"><li>a) a non-inducible promoter; and</li><li>b) an inducible promoter.</li></ol></li><li>90. The gene switch system of any one of items 85-89, wherein said DNA binding domain has a sequence as shown in SEQ ID NO: 184.</li><li>91. The gene switch system of any one of items 85-90, wherein said transactivation domain has a sequence as shown in SEQ ID NO: 181.</li><li>92. The gene switch system of any one of items 85-91, wherein at least one of said first and second nuclear receptor ligand binding domains and said ligand binding domain has a sequence as shown in any one of SEQ ID NOs: 185-186.</li><li>93. The gene switch system of item 89, wherein said non-inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64.</li><li>94. The gene switch system of item 89, wherein said inducible promoter has a sequence as shown in any one of SEQ ID NOs: 40-64.</li><li>95. The gene switch system of item 85, wherein said polypeptide linker has a sequence as shown in any one of SEQ ID NOs: 146-162.</li><li>96. The gene switch system of item 86, wherein said polypeptide linker is a cleavable linker, a ribosome skipping linker or an IRES linker with a sequence as shown in any one of SEQ ID NOs: 18-19 and 146-162.</li><li>97. The gene switch system of item 85, wherein said one or more expression cassettes include an expression cassette that comprises a sequence encoding a chimeric antigen receptor (CAR), wherein expression of said chimeric antigen receptor is modulated by a non-inducible promoter.</li><li>98. The gene switch system of item 97, wherein said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.</li><li>99. The gene switch system of item 97, wherein said non-inducible promoter comprises EF1A or a variant thereof.</li><li>100. The gene switch system of item 97, wherein said expression cassette has a sequence as shown in SEQ ID NO: 131.</li><li>101. The gene switch system of item 97, wherein said expression cassette further comprises a sequence encoding a cell tag, wherein said cell tag is connected to said CAR by a linker.</li><li>102. The gene switch system of item 101, wherein said cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant.</li><li>103. The gene switch system of item 102, wherein said expression cassette has a sequence as shown in SEQ ID NO: 132.</li><li>104. The gene switch system of item 97, wherein said expression cassette further comprises said sequence encoding said first gene switch polypeptide and said sequence encoding said second gene switch polypeptide, wherein one of said first and second gene switch polypeptides is connected to said CAR by a linker.</li><li>105. The gene switch system of item 104, wherein said first and second gene switch polypeptides are connected by said polypeptide linker, and said polypeptide linker is a cleavable linker.</li><li>106. The gene switch system of item 105, wherein said expression cassette has a sequence as shown in SEQ ID NO: 133.</li><li>107. The gene switch system of item 106, wherein said first and second gene switch polypeptides are connected by said polypeptide linker, and said polypeptide linker is an IRES linker.</li><li>108. The gene switch system of item 107, wherein said expression cassette has a sequence as shown in SEQ ID NO: 134.</li><li>109. The gene switch system of item 86 or 87, wherein said one or more expression cassettes includes an expression cassette that comprises said sequence encoding said heterologous gene polypeptide, wherein expression of said heterologous gene polypeptide is modulated by an inducible promoter.</li><li>110. The gene switch system of item 109, wherein said heterologous gene polypeptide comprises a cytokine.</li><li>111. The gene switch system of item 110, wherein said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.</li><li>112. The gene switch system of item 109, wherein said expression cassette has a sequence as shown in SEQ ID NO: 135.</li><li>113. The gene switch system of item 109, wherein said expression cassette comprises a sequence encoding a second heterologous gene polypeptide, wherein said second heterologous gene polypeptide comprises a cell tag.</li><li>114. The gene switch system of item 113, wherein said cell tag comprises at least one of a HER1 truncated variant and a CD20 truncated variant.</li><li>115. The gene switch system of item 114, wherein said cell tag is connected to said cytokine by a linker.</li><li>116. The gene switch system of item 115, wherein said expression cassette has a sequence as shown in SEQ ID NO: 136.</li><li>117. The gene switch system of item 88, wherein said gene switch system is for integrating a heterologous gene in a host cell, wherein upon contacting said host cell with said one or more expression cassettes in the presence of said serine recombinase and said one or more recombinase attachment sites, said heterologous gene is integrated in said host cell.</li><li>118. The gene switch system of item 117, wherein said system further comprises a ligand, wherein said heterologous gene is expressed in said host cell upon contacting said host cell with said ligand.</li><li>119. The gene switch system of item 117 or118, wherein said host cell is a T cell or an NK cell.</li><li>120. The gene switch system of item 89, wherein said inducible promoter is activated by said transactivation domain.</li><li>121. The gene switch system of any one of items 85-120, wherein said system is contained in one or more vectors.</li><li>122. The gene switch system of item 121, wherein said system is contained in one vector.</li><li>123. A polynucleotide encoding one or more of the components of the gene switch system of any one of items 85-89.</li><li>124. A vector that comprises the polynucleotide of item 123.</li><li>125. The vector of item 124, wherein said vector is any one of a lentivirus vector, a retroviral vector, or a non-viral vector.</li><li>126. The vector of item 125, wherein said vector is a non-viral vector and said non-viral vector is a Sleeping Beauty transposon.</li><li>127. A polynucleotide construct that comprises: <ul id="ul0004" list-style="none" compact="compact"><li>a polynucleotide that encodes a first gene switch polypeptide,</li><li>a polynucleotide that encodes a second gene switch polypeptide, and</li><li>a polynucleotide that encodes a gene of interest (GOI),</li><li>wherein the polynucleotide that encodes the GOI comprises a continuous open-reading frame (ORF) positioned between the polynucleotide that encodes the first gene switch polypeptide and the polynucleotide that encodes the second gene switch polypeptide, wherein the polynucleotide construct further comprises a polynucleotide that encodes a linker, and wherein said GOI is connected by said linker to each of said first and second gene switch polypeptides.</li></ul></li><li>128. A polynucleotide that comprises at least one of: (i) a first sequence that encodes a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain; and (ii) a second sequence that encodes a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain; wherein expression of at least one of said first sequence and said second sequence is modulated by one or more NFAT response element.</li><li>129. A-method of stimulating the proliferation and/or survival of engineered cells, the method comprising: <ol id="ol0009" compact="compact"><li>(a) obtaining a sample of cells from a subject, and</li><li>(b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: <ul id="ul0005" list-style="none" compact="compact"><li>a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate said one or more polynucleotides into the genome of said cells, to provide a population of engineered cells;</li><li>wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.</li></ul></li></ol></li><li>130. A method of enhancing <i>in vivo</i> persistence of engineered cells in a subject in need thereof, the method comprising: <ol id="ol0010" compact="compact"><li>(a) obtaining a sample of cells from a subject, and</li><li>(b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: <ul id="ul0006" list-style="none" compact="compact"><li>a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate the DNA into the genome of said cells, to provide a population of engineered cells;</li><li>wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker.</li></ul></li></ol></li><li>131. The method of item 129 or 130, wherein said transfecting cells comprises electroporating the cells.</li><li>132. The method of any one of items 129-131, wherein at least one polynucleotide of said one or more polynucleotides encodes said gene switch polypeptides, and said at least one polynucleotide is modulated by a promoter, wherein said promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof.</li><li>133. The method of item 132, wherein said promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60.</li><li>134. The method of item 132, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises a T-cell-specific response element.</li><li>135. The method of item 132, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises one or more NFAT response element.</li><li>136. The method of item 135, wherein said NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57.</li><li>137. The method of any one of items 129-136, wherein said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.</li><li>138. The method of item 137, wherein said cytokine is in secreted form.</li><li>139. The method of item 137, wherein said cytokine is in membrane-bound form.</li><li>140. The method of any one of items 137-139, wherein said cytokine has a sequence as shown in any one of SEQ ID NOs: 203-209.</li><li>141. The method of any one of items 129-140, wherein said cells are NK cells, NKT cells, T-cells or T-cell progenitor cells.</li><li>142. The method of any one of items 129-141, wherein said method further comprises administering an effective amount of said engineered cells to a subject in need thereof.</li><li>143. The method of item 142, wherein said administering comprises immediately infusing said subject with said engineered cells.</li><li>144. The method of item 142 or 143, wherein said method further comprises administering an effective amount of said ligand to induce expression of said cytokine.</li><li>145. The method of item 144, wherein said ligand is veledimex.</li><li>146. The method of any one of items 129-145, wherein said CAR is capable of binding at least one of CD19, CD33, BCMA, CD44, α-Folate receptor, CAIX, CD30, ROR1, CEA, EGP-2, EGP-40, HER2, HER3, Folate-binding Protein, GD2, GD3, IL-13R-a2, KDR, EDB-F, mesothelin, CD22, EGFR, MUC-1, MAGE-A1, MUC-16, h5T4, PSMA, TAG-72, EGFRvIII, CD123 and VEGF-R2.</li><li>147. The method of item 146, wherein said CAR is capable of binding said CD19.</li><li>148. The method of item 146, wherein said CAR is capable of binding said CD33.</li><li>149. The method of any one of items 129-148, wherein said transposase is salmonid-type Tc1-like transposase.</li><li>150. The method of any one of items 129-149, wherein said transposase is SB11 or SB100x transposase.</li><li>151. The method of any one of items 129-150, wherein said one or more cell tags comprises at least one of a HER1 truncated variant and a CD20 truncated variant.</li><li>152. The method of any one of items 129-151, wherein said one or more cell tags has a sequence as shown in any one of SEQ ID NOs: 189-202.</li><li>153. A method of treating a subject with a solid tumor, the method comprising: <ol id="ol0011" compact="compact"><li>(a) obtaining a sample of cells from a subject,</li><li>(b) transfecting cells of said sample of cells with one or more polynucleotides that comprise one or more transposons, wherein said one or more transposons encode: <ul id="ul0007" list-style="none" compact="compact"><li>a chimeric antigen receptor (CAR) or a TCR, a cytokine, one or more cell tags, gene switch polypeptides for ligand-inducible control of said cytokine and a transposase effective to integrate the DNA into the genome of said cells, to provide a population of engineered cells;</li><li>wherein said gene switch polypeptides comprise: i) a first gene switch polypeptide that comprises a DNA binding domain fused to a first nuclear receptor ligand binding domain, and ii) a second gene switch polypeptide that comprises a transactivation domain fused to a second nuclear receptor ligand binding domain, wherein said first gene switch polypeptide and said second gene switch polypeptide are connected by a linker, and</li></ul></li><li>(c) administering said population of engineered cells to said subject.</li></ol></li><li>154. The method of item 153, wherein said cytokine comprises at least one of IL-1, IL-2, IL-15, IL-12, IL-21, a fusion of IL-15, IL-15Rα, or an IL-15 variant.</li><li>155. The method of item 154, wherein said cytokine comprises IL-12.</li><li>156. The method of item 153, wherein at least one polynucleotide of said one or more polynucleotides encodes said gene switch polypeptides, and said at least one polynucleotide is modulated by a promoter, wherein said promoter is a tissue-specific promoter or an EF1A promoter or functional variant thereof.</li><li>157. The method of item 156, wherein said promoter is an EF1A promoter or functional variant thereof having a sequence as shown in any one of SEQ ID NOs: 58-60.</li><li>158. The method of item 156, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises a T-cell-specific response element.</li><li>159. The method of item 156, wherein said promoter is a tissue-specific promoter, and said tissue-specific promoter comprises one or more NFAT response element.</li><li>160. The method of item 159, wherein said NFAT response element has a sequence as shown in any one of SEQ ID NOs: 50-57.</li></ol>