Compositions and methods for purifying recombinant adeno-associated virus

1. A method of purifying recombinant adeno-associated virus (rAAV) particles from a cell culture comprising the rAAV particles, the method comprising:

a) providing a crude cell lysate from the cell culture having a pH of between 6 and 9 and comprising the rAAV particles;

b) reducing the pH of the crude cell lysate of a) to less than or equal to 5 to produce a flocculate and a supernatant comprising the rAAV particles;

c) isolating the supernatant comprising the rAAV particles from the flocculate; and

d) contacting the isolated supernatant of c) with a cation exchange chromatography, thereby purifying the rAAV particles.

2. The method of claim 1 , wherein reducing the pH in b) comprises contacting the cell lysate comprising the rAAV particles with a triprotic acid.

3. The method of claim 2 , wherein the triprotic acid is citric acid.

4. The method of claim 1 , wherein the cell lysate of a) further comprises sodium citrate.

5. The method of claim 4 , wherein the cell lysate further comprises an endonuclease.

6. The method of claim 4 , wherein the cell lysate further comprises Mg 2+ and benzonase.

7. The method of claim 1 , wherein in step c) the isolating the supernatant comprising the rAAV particles from the flocculate comprises centrifugation or filtration.

8. The method of claim 1 , wherein the cell lysate of a) is a mammalian or an insect cell lysate.

9. The method of claim 1 , wherein the cation exchange chromatography is sulfopropyl column chromatography.

10. The method of claim 1 , wherein the method further comprises: e) at least one of further purifying and concentrating the purified rAAV particles of d) by at least one of tangential flow filtration and centrifugation, thereby producing the further purified, concentrated, or purified concentrated rAAV particles.

11. The method of claim 1 , wherein the cell lysate in a) is produced by microfluidization, sonication, freeze/thawing, or hypotonic lysis of cells comprising the rAAV particles.

12. The method of claim 1 , wherein in step b) the reducing the pH of the cell lysate comprising the rAAV particles is to between pH 3 and 5.

13. The method of claim 1 , wherein the rAAV particles are rAAV3, rAAV8, rAAV9 or rAAV10 particles.

14. The method of claim 1 , wherein the rAAV particles of (d) are added to a pharmaceutical composition.

15. The method of claim 14 , wherein the pharmaceutical composition comprises a pharmaceutically acceptable carrier.