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Site-specific integration by adeno-associated virus.
R M Kotin1, M Siniscalco, R J Samulski
1Hearst Microbiology Research Center, Department of Microbiology, Cornell University Medical College, New York, NY 10021.
Summary
The adeno-associated virus (AAV) genome shows a preference for integrating into a specific region on human chromosome 19. This targeted integration was identified across multiple independently derived infected cell clones.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Adeno-associated virus (AAV) is a small DNA virus with potential therapeutic applications.
- Understanding AAV integration into the host genome is crucial for assessing its safety and efficacy.
- Latent infections involve the stable presence of viral genomes within host cells.
Purpose of the Study:
- To investigate the integration patterns of the adeno-associated virus (AAV) genome in human cells.
- To identify specific cellular genomic locations targeted by AAV integration.
- To characterize the chromosomal localization of AAV integration sites.
Main Methods:
- Isolation of cellular sequences flanking integrated AAV genomes from infected cell lines.
- Genomic blotting using flanking-sequence and AAV probes on DNA from multiple infected clones.
- Somatic cell hybrid mapping to determine chromosomal localization of integration sites.
Main Results:
- AAV integration was observed in 15 out of 22 independently derived latently infected human cell clones.
- Hybridization patterns indicated preferential integration into specific cellular genomic regions.
- Somatic cell hybrid mapping identified chromosome 19 as the unique integration site for AAV.
Conclusions:
- The adeno-associated virus (AAV) genome demonstrates a strong preference for integrating into a specific locus within the human genome.
- This preferential integration site has been mapped to chromosome 19.
- The identified AAV integration site sequence has been successfully isolated from uninfected human DNA.