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- W1999179065 abstract "We studied the ability of single-stranded DNA (ssDNA) to participate in targeted recombination in mammalian cells. A 5' end-deleted adenine phosphoribosyltransferase (aprt) gene was subcloned into M13 vector, and the resulting ssDNA and its double-stranded DNA (dsDNA) were transfected to APRT-Chinese hamster ovary cells with a deleted aprt gene. APRT+ recombinants with the ssDNA was obtained at a frequency of 3 x 10(-7) per survivor, which was almost equal to that with the double-stranded equivalent. Analysis of the genome in recombinant clones produced by ssDNA revealed that 12 of 14 clones resulted from correction of the deletion in the aprt locus. On the other hand, the locus of the remaining 2 was not corrected; instead, the 5' deletion of the vector was corrected by end extension, followed by integration into random sites of the genome. To exclude the possibility that input ssDNA was converted into its duplex form before participating in a recombination reaction, we compared the frequency of extrachromosomal recombination between noncomplementary ssDNAs, and between one ssDNA and one dsDNA, of two phage vectors. The frequency with the ssDNAs was 0.4 x 10(-5), being 10-fold lower than that observed with the ssDNA and the dsDNA, suggesting that as little as 10% of the transfected ssDNA was converted into duplex forms before the recombination event, hence 90% remained unchanged as single-stranded molecules. Nevertheless, the above finding that ssDNA was as efficient as dsDNA in targeted recombination suggests that ssDNA itself is able to participate directly in targeted recombination reactions in mammalian cells." @default.
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- W1999179065 date "1993-01-01" @default.
- W1999179065 modified "2023-09-25" @default.
- W1999179065 title "Targeted recombination with single-stranded DNA vectors in mammalian cells" @default.
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- W1999179065 doi "https://doi.org/10.1093/nar/21.3.407" @default.
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