IP Library › Granted Patent US 11,001,859

Granted Patent B2

US 11,001,859 · App. 16/705,831 · Granted May 11, 2021

Recombinantly-modified adeno-associated virus helper vectors and their use to improve the packaging efficiency of recombinantly-modified adeno-associated virus

Inventor: Qizhao Wang (Rockville, MD)

Assignee: Vigene Biosciences, Inc.

C12N15/86 C12N5/0601 C12N5/0686

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Quick Facts

Patent No.: US 11,001,859
App. No.: 16/705,831
Granted: May 11, 2021
Kind: B2

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Abstract

The present invention is directed to recombinantly-modified adeno-associated virus (AAV) helper vectors that are capable of increasing the packaging efficiency of recombinantly-modified adeno-associated virus (rAAV) and their use to improve the packaging efficiency of such rAAV. The present invention is particularly directed to recombinantly-modified adeno-associated virus (AAV) helper vectors that have been further modified to replace (or augment) the P5 and/or P40 promoter sequences that are natively associated with the Rep proteins encoded by such rAAV with AAV P5 and/or P40 promoters that are associated with the Rep proteins of an rAAV of different serotype. The use of such substitute or additional promoter sequences causes increased production of recombinantly-modified adeno-associated virus.

Claims (89)

1. A method for increasing the production titer of a recombinantly-modified adeno-associated virus (rAAV) that comprises a transgene cassette that is flanked by inverted terminal repeated sequences, wherein said method comprises culturing human embryonic kidney cells or baby hamster kidney cells transfected with:

(1) an rAAV plasmid vector that comprises said transgene cassette flanked by said inverted terminal repeated sequences; and

(2) an rAAV helper vector that comprises an AAV helper function-providing polynucleotide, wherein said polynucleotide comprises an AAV P5 promoter sequence, an AAV P40 promoter sequence, an AAV Cap encoding sequence, and an AAV Rep encoding sequence;

wherein said AAV Rep encoding sequence is under the transcriptional control of said AAV P5 promoter sequence, and expresses said AAV Rep52 protein and said AAV Rep78 protein in said transfected cells;

wherein said AAV Cap encoding sequence is under the transcriptional control of said AAV P40 promoter sequence, and expresses said AAV Cap protein in said transfected cells; and

wherein said AAV P5 promoter sequence is not native to said AAV Rep encoding sequence and/or said AAV P40 promoter sequence is not native to said AAV Cap encoding sequence; and

(3) an Ad helper plasmid vector that comprises a polynucleotide encoding viral transcription and translation factors required for the replication and packaging of rAAV;

wherein said culturing is conducted in a culture medium under conditions sufficient to permit the production of said rAAV and wherein:

(A) (1) said Rep encoding sequence of said rAAV helper vector is an AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV1, the P5 promoter of AAV3, the P5 promoter of AAV5, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said Cap encoding sequence of said rAAV helper vector is an AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2; or

(B) (1) said Rep encoding sequence of said rAAV helper vector is an AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV2, and

(2) said Cap encoding sequence of said rAAV helper vector is an AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV1 or the P40 promoter of AAV8; or

(C) (1) said Rep encoding sequence of said rAAV helper vector is an AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV3 or the P5 promoter of AAV5, and

(2) said Cap encoding sequence of said rAAV helper vector is an AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV1; or

(D) (1) said Rep encoding sequence of said rAAV helper vector is an AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV1, the P5 promoter of AAV2, the P5 promoter of AAV3, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said Cap encoding sequence of said rAAV helper vector is an AAV6 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2; or

(E) (1) said Rep encoding sequence of said rAAV helper vector is an AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV2, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said Cap encoding sequence of said rAAV helper vector is an AAV1 Cap encoding sequence, an AAV5 Cap encoding sequence or an AAV7 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2;

wherein the transfection of said cells with said rAAV plasmid vector, said Ad helper plasmid, and said rAAV helper vector that comprises:

(1) said AAV P5 promoter sequence that is not native to said AAV Rep coding sequence of said rAAV helper vector, and/or

(2) said AAV P40 promoter sequence that is not native to said AAV Cap coding sequence of said rAAV helper vector causes said transfected cells to produce said rAAV at a production titer that is increased relative to that which would be attained if said AAV P5 promoter sequence of said rAAV helper vector were native to said Rep encoding sequence of said rAAV helper vector and said AAV P40 promoter sequence of said rAAV helper vector were native to said Cap encoding sequence of said rAAV helper vector.

2. The method of claim 1 , wherein said rAAV helper vector comprises:

(1) said AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV1, the P5 promoter of AAV3, the P5 promoter of AAV5, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2.

3. The method of claim 1 , wherein said rAAV helper vector comprises:

(1) said AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV2, and

(2) said AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV1 or the P40 promoter of AAV8.

4. The method of claim 1 , wherein said rAAV helper vector comprises:

(1) said AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV3 or the P5 promoter of AAV5, and

(2) said AAV2 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV1.

5. The method of claim 1 , wherein said rAAV helper vector comprises:

(1) said AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV1, the P5 promoter of AAV2, the P5 promoter of AAV3, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said AAV6 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2.

6. The method of claim 1 , wherein said rAAV helper vector comprises:

(1) said AAV2 Rep encoding sequence that is under the transcriptional control of the P5 promoter of AAV2, the P5 promoter of AAV7 or the P5 promoter of AAV8, and

(2) said AAV1, said AAVS or said AAV7 Cap encoding sequence that is under the transcriptional control of the P40 promoter of AAV2.

7. The method of claim 1 , wherein said method comprises culturing the human embryonic kidney cells.

8. The method of claim 7 , wherein said human embryonic kidney cells are HEK 293 human embryonic kidney cells.

9. The method of claim 1 , wherein said method comprises culturing the baby hamster kidney cells.

10. The method of claim 9 , wherein said baby hamster kidney cells are BHK21 baby hamster kidney cells.

11. The method of claim 1 , wherein said transgene cassette encodes a protein, or comprises a polynucleotide domain that is transcribed into an RNA molecule, wherein said protein or said RNA molecule is therapeutic for a disease or a condition that is genetic or heritable.

12. The method of claim 11 , wherein said transgene cassette encodes the protein that is therapeutic for said disease or said condition that is genetic or heritable.

13. The method of claim 11 , wherein said transgene cassette comprises the polynucleotide domain that is transcribed into the RNA molecule that is therapeutic for said disease or said condition that is genetic or heritable.

14. The method of claim 11 , wherein said disease or said condition that is genetic or heritable is: achromatopsia (ACHM); alpha-1 antitrypsin (AAT) deficiency; Alzheimer's Disease; aromatic L-amino acid decarboxylase (AADC) deficiency; choroideremia (CHM); cancer; Duchenne muscular dystrophy; dysferlin deficiency; follistatin gene deficiency (BMDSIBM); hemophilia A; hemophilia B; hepatitis A; hepatitis B; hepatitis C; Huntington's disease; idiopathic Parkinson's disease; late-infantile neuronal ceroid lipofuscinosis (LINCL, an infantile form of Batten disease); Leber congenital amaurosis (LCA); Leber's hereditary optic neuropathy (LHON); limb girdle muscular dystrophy 1B (LGMD1B); limb girdle muscular dystrophy 1C (LGMD1C); limb girdle muscular dystrophy 2A (LGMD2A); limb girdle muscular dystrophy 2B (LGMD2B); limb girdle muscular dystrophy 2I (LGMD2I); limb girdle muscular dystrophy 2L (LGMD2L); lipoprotein lipase (LPL) deficiency; metachromatic leukodystrophy; neurological disability; neuromotor deficit; neuroskeletal impairment; Parkinson's disease; rheumatoid arthritis; Sanfilippo A syndrome; spinal muscular atrophy (SMA); X-linked retinoschisis (XLRS); α-sarcoglycan deficiency (LGMD2D); β-sarcoglycan deficiency (LGMD2E); γ-sarcoglycan deficiency (LGMD2C); or δ-sarcoglycan deficiency (LGMD2F).

15. A method for increasing the production titer of a recombinantly-modified adeno-associated virus that comprises a transgene cassette that is flanked by inverted terminal repeated sequences, wherein said method comprises culturing human embryonic kidney cells or baby hamster kidney cells transfected with:

(1) an rAAV plasmid vector that comprises said transgene cassette flanked by said inverted terminal repeated sequences; and

(2) an rAAV helper vector that comprises:

(a) an AAV helper function-providing polynucleotide portion that comprises an AAV P5 promoter sequence, an AAV P40 promoter sequence, an AAV Cap encoding sequence, and an AAV Rep encoding sequence;

wherein said AAV Cap encoding sequence is under the transcriptional control of said AAV P40 promoter sequence, and expresses said AAV Cap protein in said transfected cells; and

wherein said AAV P5 promoter sequence is not native to said AAV Rep encoding sequence and/or said AAV P40 promoter sequence is not native to said AAV Cap encoding sequence; and

(b) a non-AAV helper function-providing polynucleotide portion that encodes viral transcription and translation factors required for the replication and packaging of rAAV;