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Kay, Mark A; Nakai, Hiroyuki; Montini, Eugenio; Fuess, Sally; Storm, Theresa A; Grompe, Markus
Nature genetics, 07/2003, Letnik: 34, Številka: 3Journal Article
Recombinant adeno-associated virus serotype 2 (rAAV2) is a promising vector for gene therapy because it can achieve long-term stable transgene expression in animals and human subjects after direct administration of vectors into various target tissues. In the liver, although stable transgene expression primarily results from extrachromosomal vector genomes, a series of experiments has shown that vector genomes integrate into host chromosomes in hepatocytes at a low frequency. Despite the low integration efficiency, recent reports of retroviral insertional mutagenesis in mice and two human subjects have raised concerns about the potential for rAAV2-mediated insertional mutagenesis. Here we characterize rAAV2-targeted chromosomal integration sites isolated from selected or non-selected hepatocytes in vector-injected mouse livers. We document frequent chromosomal deletions of up to 2 kb at integration sites (14 of 14 integrations, 100%; most of the deletions were <0.3 kb) and preferred integration into genes (21 of 29 integrations, 72%). In addition, all of the targeted genes analyzed (20 of 20 targeted genes, 100%) were expressed in the liver. This is the first report to our knowledge on host chromosomal effects of rAAV2 integration in animals, and it provides insights into the nature of rAAV2 vector integration into chromosomes in quiescent somatic cells in animals and human subjects.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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