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- W2077283409 abstract "The frequency of reversions induced in Escherichia coli K-12 trpA58 by any of five different monofunctional alkylating agents increased as the growth rate of the organism was raised prior to mutagen treatment. The increase in mutation frequency did not correlate with growth rate-dependent changes in cell area or total cellular protein and DNA. After treatment of cells with N-methyl-N-nitrosourea (MNUA), no growth rate-dependent change was observed in the total DNA alkylation or percentage of O6-methylguanine present in the DNA extracted. The frequency of reversions induced by one mutagen, methyl methanesulphonate (MMS), increased in proportion to the average number of trpA gene copies per cell, whereas the frequency of reversions induced by the other compounds was dependent on the average number of chromosome replicating forks per cell. This difference was attributed to the different ratios of DNA base alkylation products observed, formed after treatment with MMS, an SN2-type reagent, or after treatment with the SN1-type reagents ethyl methanesulphonate (EMS), N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), MNUA and N-ethyl-N-nitrosourea (ENUA). Possible reasons for the dependence of mutation frequency on the number of replicating forks per cell are discussed." @default.
- W2077283409 created "2016-06-24" @default.
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- W2077283409 date "1977-04-01" @default.
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- W2077283409 title "Physiological modification of alkylating agent induced mutagenesis. II. Influence of the numbers of chromosome replicating forks and gene copies on the frequency of mutations induced in Escherichia coli" @default.
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- W2077283409 doi "https://doi.org/10.1016/0027-5107(77)90127-0" @default.
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