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- W1998213056 abstract "The Sleeping Beauty (SB) transposon is a Tc1/mariner family transposon that is being examined for its efficacy as a non-viral, integrating vector for human gene therapy. Integration of SB transposons, into TA dinucleotide base pairs, with respect to genes (exons and introns) and intergenic regions appears fairly random at the genomic level, but not on a micro-scale, with a previously reported consensus sequence around the TA-integration sites [Vigdal et al. (2002) J. Mol. Biol. 323: 441|[ndash]|452; Carlson et al. (2003) Genetics 165: 243|[ndash]|256]. In an earlier study [Liu et al. (2005) J. Mol. Biol. 346: 161|[ndash]|173], we analyzed target-site preferences of SB transposons using an intra-plasmid transposition assay. We found that preferential sites had a unique deformation pattern that was characterized by an off-center angling, non-uniform twisting of the DNA helix and an increase in the distance between the central base pairs at preferred target sites. Particular deformations of the double helix could be predicted by the Vstep algorithm, which distinguished three categories of TA sites that varied by about 16-fold in their acceptance of SB transposons: preferred, intermediate-preferred, and non-preferred. Here we report our results of integrations into TA sites in the ninth intron of the mouse B-raf gene. Transpositions occurred as a result of remobilization, by SB10 transposase, of chromosomally-resident |[ldquo]|insertionally oncogenic|[rdquo]| transposons in somatic tissues of transgenic mice. This resulted in oncogenic selection of 25 gain-of-function insertions into B-raf in p19Arf|[minus]|/|[minus]| mice [Collier and Carlson et al., submitted]. There are 349 potential TA-integration sites in the 4069-bp intron, of which 22 were targets for 25 unique insertions. The Vstep algorithm predicted preferential patterns for 44 of the 349 possible sites, of which 7 were hit and three were hit twice (a 23% hit rate). There were 107 predicted intermediate-preferred sites of which 11 were targets (10% hit rate), and 198 non-preferred sites of which 4 were hit (a 2% hit rate). These data strongly suggest about an 11-fold preference for integration at certain TA dinucleotide base pairs in chromatin, which can be predicted by the Vstep algorithm. This data suggests that a V-step algorithm can predict preferential insertion sites for transposon vectors during non-viral, SB-mediated gene transfer protocols." @default.
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- W1998213056 date "2005-05-01" @default.
- W1998213056 modified "2023-10-18" @default.
- W1998213056 title "176. Target-Site Preferences of Sleeping Beauty Transposons in an Intron of the B-raf Oncogene" @default.
- W1998213056 doi "https://doi.org/10.1016/j.ymthe.2005.06.179" @default.
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