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- W2525991689 abstract "A variety of mutations in lentiviral vector expression systems have been shown to generate a non-integrating phenotype. We studied a novel 12 base-pair U3-long terminal repeats (LTR) integrase (IN) attachment site deletion (U3-LTR att site) mutant and found similar physical titers to the previously reported IN catalytic core mutant IN/D116N. Both mutations led to a greater than two log reduction in vector integration; with IN/D116N providing lower illegitimate integration frequency, whereas the U3-LTR att site mutant provided a higher level of transgene expression. The improved expression of the U3-LTR att site mutant could not be explained solely based on an observed modest increase in integration frequency. In evaluating processing, we noted significant differences in unintegrated vector forms, with the U3-LTR att site mutant leading to a predominance of 1-LTR circles. The mutations also differed in the manner of illegitimate integration. The U3-LTR att site mutant vector demonstrated IN-mediated integration at the intact U5-LTR att site and non-IN-mediated integration at the mutated U3-LTR att site. Finally, we combined a variety of mutations and modifications and assessed transgene expression and integration frequency to show that combining modifications can improve the potential clinical utility of non-integrating lentiviral vectors." @default.
- W2525991689 created "2016-10-07" @default.
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- W2525991689 date "2016-09-28" @default.
- W2525991689 modified "2023-09-26" @default.
- W2525991689 title "Differences in vector-genome processing and illegitimate integration of non-integrating lentiviral vectors" @default.
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- W2525991689 doi "https://doi.org/10.1038/gt.2016.69" @default.
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