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- W2076570569 abstract "We have previously shown that a single N-2-acetylaminofluorene (AAF) adduct bound to the C-8 position of a guanine residue located within plasmids containing the unidirectional ColE1 origin of replication induces a 20-fold higher mutation frequency when the adduct is located in the lagging strand as compared to the leading strand. In this study, single 7,8-dihydro-8-oxo-2′-deoxyguanosine (8-oxodG) lesions have been intro duced in the leading and lagging strand orientation within the same sequence context as for the AAF adducts. The induced frequency of guanine to thymine transversions has been measured, using a specific PCR-based quantitative assay, in strains deficient in the repair of the oxidative lesion. The potential involvement of the UvrABC excision repair system in the removal of 8-oxodG has also been investigated and ruled out. Concerning the mutation frequency asymmetry, in contrast to AAF adducts, 8-oxodG adducts induce the same mutation frequency, irrespective of their location in the leading or lagging strands. This striking difference between 8-oxodG and dGuo-C8-AAF adducts is discussed in terms of their differential capacity to block DNA replication." @default.
- W2076570569 created "2016-06-24" @default.
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- W2076570569 date "1997-01-01" @default.
- W2076570569 modified "2023-10-18" @default.
- W2076570569 title "Leading versus lagging strand mutagenesis induced by 7,8-dihydro-8-oxo-2′-deoxyguanosine in Escherichia coli" @default.
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- W2076570569 doi "https://doi.org/10.1006/jmbi.1996.0740" @default.
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