alexa Adeno-associated virus (AAV) Rep proteins mediate complex formation between AAV DNA and its integration site in human DNA.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Molecular and Genetic Medicine

Author(s): Weitzman MD, Kysti SR, Kotin RM, Owens RA

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Abstract AAV is unique among eukaryotic viruses in the ability of its DNA to integrate preferentially into a specific region of the human genome. Understanding AAV integration may aid in developing gene therapy systems with predictable integration sites. Using a gel mobility-shift assay, we have identified a DNA sequence within the AAV integration locus on human chromosome 19 which is specifically bound by the AAV Rep78 and Rep68 proteins. This Rep recognition sequence is a GCTC repeating motif very similar to sequences within the inverted terminal repeats of the AAV genome which are also bound by Rep78 and Rep68. Cloned oligonucleotides containing the recognition sequence can direct specific binding by Rep proteins. Binding assays with mutant Rep proteins show that the amino-terminal portion of Rep78 and Rep68 can direct binding to either the AAV terminal repeat hairpin DNA or chromosome 19. This human genomic DNA can be complexed with AAV DNA by Rep proteins as demonstrated by a dual-label (32P/biotin) assay. These results suggest a role for Rep in targeting viral integration.
This article was published in Proc Natl Acad Sci U S A and referenced in Journal of Molecular and Genetic Medicine

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