Gene editing for HIV gene therapy
The present disclosure is in the field of genome engineering, particularly targeted integration of anti-HIV transgenes into the genome of a cell for the treatment and/or prevention of HIV.
1. An isolated genetically modified cell that will not sustain HIV infection, wherein the genetic modifications comprise:
(i) modification of an endogenous Trim5α gene to increase its activity against HIV;
(ii) modification of an endogenous viral host factor gene by mutations, which mutations decrease its ability to support HIV infection; and
(iii) insertion of an exogenous transgene encoding a Trim5α-cyclophilin A peptide (Trim5α-Cyp) fusion protein into an endogenous safe harbor locus wherein the genetically modified cell will not sustain HIV infection.
2. The cell of claim 1 , wherein the cell is stem cell.
3. The stem cell of claim 2 , wherein the stem cell is a hematopoietic stem cell (HSC).
4. An isolated genetically modified cell descended from the cell of claim 1 .
5. A composition comprising the cell of claim 4 .
6. A method of generating the cell according to claim 1 , the method comprising genetically modifying the cell such that:
(i) an endogenous Trim5α gene is modified to increase its activity against HIV;
(ii) an endogenous viral host factor gene is modified by mutations, which mutations decrease its ability to support HIV infection; and
(iii) an exogenous transgene encoding a Trim5α-Cyp fusion protein is inserted into an endogenous safe harbor locus
wherein the cell will not sustain HIV infection.
7. The method of claim 6 , wherein the modification of the endogenous Trim5α comprises introduction of one or more point mutations in the endogenous gene sequence to alter the amino acid sequence of the encoded Trim5α or introduction of a sequence encoding a functional domain such that the sequence encoding the functional domain is operably linked to the endogenous sequence encoding the Trim5α.
8. The method of claim 7 , wherein the amino acids modified are R332 and R335 in TRIM5α.
9. The method of claim 6 , wherein the Cyp peptide comprises a cyclophilin A (CypA) peptide.
10. The method of claim 6 , wherein in the modification of an endogenous viral host factor comprises introduction of mutations that knock out the expression of the endogenous viral host factor.
11. The method of claim 10 , wherein the endogenous viral host factor is selected from the group of LEDGF/p75 (PSIP1), FPSF6, Nup358 and TNP03.
12. The method of claim 6 , wherein the safe harbor locus is selected from the group of CCR5, AAVS1, or HPRT.
13. The method of claim 6 , wherein modification is made using a nuclease.
14. The method of claim 13 , wherein the nuclease comprises a zinc finger nuclease (ZFN), a TALE-effector domain nuclease (TALEN), CRIPSR/Cas system or TtAgo system.