Abstract
Adeno-associated virus (AAV) is a prevalent human virus whose replication requires factors provided by a coinfecting helper virus. AAV can establish latent infections in vitro by integration of the AAV genome into cellular DNA. To study the process of integration as well as the rescue of AAV replication in latently infected cells after superinfection with a helper virus, we established a panel of independently derived latently infected cell clones. KB cells were infected with a high multiplicity of AAV in the absence of helper virus, cloned, and passaged to dilute out input AAV genomes. AAV DNA replication and protein synthesis were rescued from more than 10% of the KB cell clones after superinfection with adenovirus type 5 (Ad5) or herpes simplex virus types 1 or 2. In the absence of helper virus, there was no detectable expression of AAV-specific RNA or proteins in the latently infected cell clones. Ad5 superinfection also resulted in the production of infectious AAV in most cases. All mutant adenoviruses tested that were able to help AAV DNA replication in a coinfection were also able to rescue AAV from the latently infected cells, although one mutant, Ad5hr6, was less efficient at AAV rescue. Analysis of high-molecular-weight cellular DNA indicated that AAV sequences were integrated into the cell genome. The restriction enzyme digestion patterns of the cellular DNA were consistent with colinear integration of the AAV genome, with the viral termini present at the cell-virus junction. In addition, many of the cell lines appeared to contain head-to-tail concatemers of the AAV genome. The understanding of the integration of AAV DNA is increasingly important since AAV-based vectors have many advantages for gene transduction in vitro and in vivo.
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Selected References
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