Modified AAV constructs and uses thereof
The present disclosure relates to the field of rAAV delivery of transgenes. In some aspects, the disclosure relates to RNAi. Provided herein are recombinant adeno-associated virus (rAAV) vectors comprising modified ITRs. In some embodiments, the modified ITRs comprise a sequence encoding a shRNA, miRNA, or AmiRNA.
1. A self-complementary AAV (scAAV) viral genome comprising wild-type inverted terminal repeats (ITRs) at each of two ends and an inner portion comprising a sequence encoding a hairpin-forming RNA, wherein the sequence encoding the hairpin-forming RNA replaces a mutant ITR normally present in a scAAV viral genome, and wherein the scAAV viral genome is capable of producing recombinant adeno-associated viral particles.
2. The self-complementary AAV (scAAV) viral genome of claim 1 , wherein the sequence encoding the hairpin-forming RNA is operably linked with a promoter.
3. The self-complementary AAV (scAAV) viral genome of claim 1 , wherein the sequence encoding a hairpin-forming RNA forms a shRNA, miRNA, or AmiRNA, wherein the AmiRNA construct comprises:
(i) a nucleic acid sequence encoding a pri-miRNA scaffold;
(ii) a nucleic acid sequence encoding a guide strand; and,
(iii) a nucleic acid sequence encoding a passenger strand,
wherein the pri-miRNA scaffold is derived from a naturally-occurring pri-miRNA and comprises at least one flanking sequence and a loop forming sequence comprising at least 4 nucleotides.
4. The self-complementary AAV (scAAV) viral genome of claim 3 , wherein the nucleic acid sequence encoding the guide strand and the nucleic acid sequence encoding the passenger strand have at least one base pair mismatch, optionally wherein at least one base pair mismatch is located at an anchor position or in a center portion of a stem.
5. The self-complementary AAV (scAAV) viral genome of claim 3 , wherein the pri-miRNA scaffold is derived from a pri-miRNA selected from the group consisting of pri-MIR-21, pri-MIR-22, pri-MIR-26a, pri-MIR-30a, pri-MIR-33, pri-MIR-122, pri-MIR-375, pri-MIR-199, pri-MIR-99, pri-MIR-194, pri-MIR-155, and pri-MIR-451.
6. The self-complementary AAV (scAAV) viral genome of claim 3 , wherein the guide strand targets a gene associated with a gain of function mutation disease, an oncogene, or a gene associated with a metabolic disorder, optionally wherein the guide strand targets SOD1, Huntington gene, p53, HER2/neu, LDLR, or beta-glucosidase.