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• W1551783196 endingPage "34" @default.
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• W1551783196 abstract "A plasmid containing the STR operon has been modified in vitro (i) by irradiation with UV light, (ii) by reaction with ethyl methanesulphonate (EMS), (iii) by reaction with N-acetoxy-2-acetylaminofluorene (AcO-AAF), (iv) by reaction with (±)trans-benzo[a]pyrene-7,8-dihydrodiol-9,10-epoxide (BPDE), and (v) by heating at 70°C to produce apurinic sites. Suitably modified plasmid DNA was then used to transform both repair-proficient and repair-deficient strains of Escherichia coli, and the mutation frequency in the plasmid-encoded rspL+ gene measured. The influence of host mutations in the uvrB+, recA+, umuC+ and lexA+, genes on the mutation frequency have been investigated. Transformation into a uvrB strain significantly decreased survival and increased the level of mutations observed for UV- and AcO-AAF-modified plasmid DNA, while only a small increase in mutation frequency was seen with EMS-modified DNA and no increase in mutation frequency with plasmid DNA containing apurinic sites. Mutagenesis in UV- and BPDE-modified DNA (and probably also DNA containing apurinic sites) was totally dependent on the recA+ gene product, while EMS and AcO-AAF induced mutagenesis was only partially independent on the recA+ gene. Transformation of UV- or BPDE-modified DNA into a umuC or lexA strain, on the other hand, showed no change in mutation frequency from that observed with wild-type strain. Pre-irradiation of the wild-type host with UV light before transformation led to a significant increase in mutation frequency for UV- and BPDE-modified plasmid DNA. These results are discussed in terms of mutational or recombinational pathways which may be available to act on modified plasmid DNA, and suggest that the majority of the mutational events measured in this system are due to recombination between homologous regions on the plasmid and chromosomal DNA." @default.
• W1551783196 created "2016-06-24" @default.
• W1551783196 creator A5022566035 @default.
• W1551783196 date "1985-01-01" @default.
• W1551783196 modified "2023-10-07" @default.
• W1551783196 title "Mutational and recombinational events in carcinogen-modified plasmid DNA" @default.
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• W1551783196 doi "https://doi.org/10.1016/0167-8817(85)90036-7" @default.
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