Compositions and methods for transient delivery of nucleases
The disclosure in some aspects relates to recombinant adeno-associated viruses having nuclease grafted to one or more capsid proteins. In some aspects, the disclosure relates to isolated AAV capsid proteins having terminally grafted nucleases and isolated nucleic acids encoding the same. Recent approaches to delivering nucleases to cells for gene editing have focused on delivering of expression vectors engineered to express the nucleases in target cells. However, these approaches have proved to be problematic in many instances due to genotoxicity resulting from to prolonged expression of gene editing system in vivo. To prevent such off-target genotoxicity due to prolonged presence of a gene editing system, several studies explored delivery of mRNA or protein instead of delivering the gene coding for the nucleases in cell culture.
1. An adeno-associated virus (AAV) capsid protein having a terminally grafted nuclease.
2. The AAV capsid protein of claim 1 , wherein the capsid protein is a VP2 capsid protein.
3. The AAV capsid protein of claim 2 , wherein the terminally grafted nuclease is grafted to the N-terminus of the VP2 capsid protein, or wherein the terminally grafted nuclease is grafted to the C-terminus of the VP2 capsid protein.
4. The AAV capsid protein of claim 1 , wherein the nuclease is selected from: Transcription Activator-like Effector Nucleases (TALENs), Zinc Finger Nucleases (ZFNs), engineered meganuclease, re-engineered homing endonucleases and a Cas-family nuclease.
5. The AAV capsid protein of claim 2 , further comprising a linker conjugated to the C-terminus of the terminally grafted nuclease and the N-terminus of the VP2 protein, or further comprising a linker conjugated to the N-terminus of the terminally grafted nuclease and the C-terminus of the VP2 protein.
6. The AAV capsid protein of claim 1 , wherein the AAV capsid protein having a terminally grafted nuclease is of:
(i) an AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8, AAV9, AAV10, AAV11, or AAV12 serotype; or
(ii) a serotype derived from a non-human primate.
7. A recombinant adeno-associated virus (rAAV) comprising the capsid protein of claim 1 .
8. The rAAV of claim 7 , wherein the rAAV comprises a transgene encoding a guide RNA.
9. The rAAV of claim 7 , wherein the AAV is an empty viral particle with no transgene.
10. An in vitro method of targeting genome editing in a cell, the method comprising: delivering to the cell a first recombinant adeno associated virus (rAAV) having a terminally-grafted Cas-family endonuclease on at least one capsid protein, wherein the terminally-grafted Cas-family endonuclease is directed to a genomic cleavage site by a guide RNA.
11. The method of claim 10 , wherein the first rAAV comprises a transgene encoding the guide RNA.
12. The method of claim 10 further comprising administering a second rAAV having a transgene encoding a guide RNA that directs the Cas-family endonuclease to a cleavage site in a target nucleic acid.
13. A composition comprising:
(i) a first recombinant adeno-associated virus (rAAV) having an terminally-grafted nuclease on at least one capsid protein; and
(ii) a second rAAV having a transgene encoding a guide RNA that directs the nuclease to a cleavage site in a target nucleic acid.
14. An adeno-associated virus (AAV) capsid protein having a terminally grafted nuclease or fragment thereof, wherein the nuclease or fragment thereof comprises a terminally grafted intein.
15. The AAV capsid protein of claim 14 , wherein the capsid protein is a VP2 capsid protein, or wherein the intein is IntN or IntC.
16. The composition of claim 13 , wherein the nuclease is selected from: Transcription Activator-like Effector Nucleases (TALENs), Zinc Finger Nucleases (ZFNs), engineered meganuclease, re-engineered homing endonucleases and a Cas-family nuclease.
17. The composition of claim 13 , wherein the capsid protein is a VP2 capsid protein.
18. The AAV capsid protein of claim 14 , wherein the nuclease is selected from: Transcription Activator-like Effector Nucleases (TALENs), Zinc Finger Nucleases (ZFNs), engineered meganuclease, re-engineered homing endonucleases and a Cas-family nuclease.