Illegitimate DNA integration in mammalian cells - PubMed (original) (raw)
Review
. 2003 Oct;10(21):1791-9.
doi: 10.1038/sj.gt.3302074.
Affiliations
- PMID: 12960968
- DOI: 10.1038/sj.gt.3302074
Review
Illegitimate DNA integration in mammalian cells
H Würtele et al. Gene Ther. 2003 Oct.
Abstract
Foreign DNA integration is one of the most widely exploited cellular processes in molecular biology. Its technical use permits us to alter a cellular genome by incorporating a fragment of foreign DNA into the chromosomal DNA. This process employs the cell's own endogenous DNA modification and repair machinery. Two main classes of integration mechanisms exist: those that draw on sequence similarity between the foreign and genomic sequences to carry out homology-directed modifications, and the nonhomologous or 'illegitimate' insertion of foreign DNA into the genome. Gene therapy procedures can result in illegitimate integration of introduced sequences and thus pose a risk of unforeseeable genomic alterations. The choice of insertion site, the degree to which the foreign DNA and endogenous locus are modified before or during integration, and the resulting impact on structure, expression, and stability of the genome are all factors of illegitimate DNA integration that must be considered, in particular when designing genetic therapies.
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