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Stress-Induced Mutagenesis

Overview
Journal EcoSal Plus
Specialty Microbiology
Date 2015 Oct 8
PMID 26442828
Citations 11
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Abstract

Early research on the origins and mechanisms of mutation led to the establishment of the dogma that, in the absence of external forces, spontaneous mutation rates are constant. However, recent results from a variety of experimental systems suggest that mutation rates can increase in response to selective pressures. This chapter summarizes data demonstrating that,under stressful conditions, Escherichia coli and Salmonella can increase the likelihood of beneficial mutations by modulating their potential for genetic change.Several experimental systems used to study stress-induced mutagenesis are discussed, with special emphasison the Foster-Cairns system for "adaptive mutation" in E. coli and Salmonella. Examples from other model systems are given to illustrate that stress-induced mutagenesis is a natural and general phenomenon that is not confined to enteric bacteria. Finally, some of the controversy in the field of stress-induced mutagenesis is summarized and discussed, and a perspective on the current state of the field is provided.

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