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- W2038084500 endingPage "247" @default.
- W2038084500 startingPage "229" @default.
- W2038084500 abstract "Antimutator alleles indentify genes whose normal products are involved in spontaneous mutagenesis pathways. Mutant alleles of the recA and umuC genes of Escherichia coli, whose wild-type alleles are components of the inducible SOS response, were shown to cause a decrease in the level of spontaneous mutagenesis. Using a series of chromosomal mutant trp alleles, which detect point mutations, as a reversion assay, it was shown that the reduction in mutagenesis is limited to base-pair substitutions. Within the limited number of sites than could be examined, transversions at AT sites were the favored substitutions. Frameshift mutagenesis was slightly enhanced by a mutant recA allele and unchanged by a mutant umuC allele. The wild-type recA and umuC genes are involved in the same mutagenic base-pair substitution pathway, designated SOS-dependent spontaneous mutagenesis (SDSM), since a recAumuC strain showed the same degree and specificity of antimutator activity as either single mutant strain. The SDSM pathway is active only in the presence of oxygen, since wild-type, recA, and umuC strains all show the same levels of reduced spontaneous mutagenesis anaerobically. The SDSM pathway can function in starving/stationary cells and may, or may not, be operative in actively dividing cultures. We suggest that, in wild-type cells, SDSM results from basal levels of SOS activity during DNA synthesis. Mutations may result from synthesis past cryptic DNA lesions (targeted mutagenesis) and/or from mispairings during synthesis with a normal DNA template (untargeted mutagenesis). Since it occurs in chromosomal genes of wild-type cells, SDSM may be biologically significant for isolates of natural enteric bacterial populations where extended starvation is often a common mode of existence." @default.
- W2038084500 created "2016-06-24" @default.
- W2038084500 creator A5028492619 @default.
- W2038084500 creator A5036732737 @default.
- W2038084500 creator A5042299178 @default.
- W2038084500 creator A5067500333 @default.
- W2038084500 creator A5041626731 @default.
- W2038084500 date "2001-02-01" @default.
- W2038084500 modified "2023-10-14" @default.
- W2038084500 title "An aerobic recA-, umuC-dependent pathway of spontaneous base-pair substitution mutagenesis in Escherichia coli" @default.
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