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- W2019994147 abstract "This study investigated the influence of different neighboring base contexts on the production of base substitutions generated by N-ethyl-N-nitrosourea (ENU). A set of bacterial strains having all possible bases neighboring an ochre (TAA) nonsense mutation in the tyrA gene of Escherichia coli were employed and true reversions of the nonsense mutation were induced by two separate doses of ENU. Base substitution mutations were investigated by direct sequencing methods. These studies revealed that 1) mutations occurring at 5'-purine-T sites were produced better, on average, than mutations involving 5'-pyrimidine-T sites, and 5'-TT sites contributed the least to the formation of mutations, 2) the order of preference for A:T to G:C transitions was 5'-GT>5'-AT, 5'-CT>5'-TT, and 3) A:T to C:G transversions at the first position of the codon (GAA mutations) were produced best at 5'-AT sites, while A:T to T:A transversions at the third position (TAT mutations) occurred more often at 5'-GT sites. These findings suggest that the occurrence of a specific mutation may reflect the sequence-dependent probability of DNA damage at a particular site as well as factors involving preferential DNA repair or differential base selection by DNA polymerase." @default.
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- W2019994147 date "2002-10-01" @default.
- W2019994147 modified "2023-09-27" @default.
- W2019994147 title "Neighboring base identity affects N-ethyl-N-nitrosourea-induced mutagenesis in Escherichia coli" @default.
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- W2019994147 doi "https://doi.org/10.1016/s0027-5107(02)00173-2" @default.
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