Targeted integration into the PPP1R12C locus
Disclosed herein are methods and compositions for targeted integration of an exogenous sequence into the human PPP1R12C locus, for example, for expression of a polypeptide of interest.
1. An isolated genetically modified cell comprising an exogenous polynucleotide integrated into an endogenous PPP1R12C (AAVS1) gene using at least one nuclease, wherein the exogenous polynucleotide is integrated into intron 1 of the endogenous AAVS1 gene and further wherein the exogenous polynucleotide does not comprise a wild-type AAV gene.
2. The cell of claim 1 , wherein the wherein the one or more nucleases target SEQ ID NO:1 or SEQ ID NO:2.
3. The cell of claim 1 , wherein the exogenous polynucleotide encodes a polypeptide.
4. The cell of claim 1 , wherein the exogenous polynucleotide comprises an exogenous promoter.
5. The cell of claim 1 , wherein expression of the exogenous polynucleotide is driven by an endogenous promoter.
6. The cell of claim 3 , wherein the polypeptide is selected from the group consisting of an antibody, an antigen, an enzyme, a growth factor, a cell surface receptor, a nuclear receptor, a hormone, a lymphokine, a cytokine, a reporter, functional fragments thereof and combinations thereof.
7. The cell of claim 6 , wherein the reporter comprises GFP.
8. The cell of claim 1 , where the exogenous polynucleotide encodes a RNA, and further wherein the RNA is selected from the group consisting of one or more shRNAs, one or more RNAi molecules, one or more miRNAs, one or more mRNAs, and combinations thereof.
9. The cell of claim 1 , wherein the exogenous polynucleotide further comprises a first nucleotide sequence that is homologous to a first sequence in the AAVS1 gene.
10. The cell of claim 9 , wherein the exogenous polynucleotide further comprises a second nucleotide sequence that is homologous to a second sequence in the AAVS1 gene.
11. The cell of claim 9 , wherein the exogenous polynucleotide comprises a tandem cassette.
12. The cell of claim 1 , wherein the exogenous polynucleotide is a plasmid.
13. The cell of claim 1 , wherein the polynucleotide is a linear DNA molecule.
14. The cell of claim 1 , wherein the at least one nuclease comprises one or more cleavage half-domains are from a Type IIS restriction endonuclease.
15. The cell of claim 14 , wherein the Type IIS restriction endonuclease is selected from the group consisting of FokI and StsI.
16. The cell of claim 15 , wherein at least one of the cleavage half-domains comprises an alteration in the amino acid sequence of the dimerization interface.
17. The cell of claim 1 , wherein the cell is a stem cell.
18. The cell of claim 17 , wherein the cell is a hematopoietic stem cell.
19. The cell of claim 1 , where the cell is a cell line.