Genetics, Vol 129, 957-962, Copyright © 1991


INVESTIGATIONS

Transient Mutators: A Semiquantitative Analysis of the Influence of Translation and Transcription Errors on Mutation Rates

J. Ninio
Institut Jacques Monod, 2 Place Jussieu, 75251 Paris cedex 05, France

A population of bacteria growing in a nonlimiting medium includes mutator bacteria and transient mutators defined as wild-type bacteria which, due to occasional transcription or translation errors, display a mutator phenotype. A semiquantitative theoretical analysis of the steady-state composition of an Escherichia coli population suggests that true strong genotypic mutators produce about 3 X 10(-3) of the single mutations arising in the population, while transient mutators produce at least 10% of the single mutations and more than 95% of the simultaneous double mutations. Numbers of mismatch repair proteins inherited by the offspring, proportions of lethal mutations and mortality rates are among the main parameters that influence the steady-state composition of the population. These results have implications for the experimental manipulation of mutation rates and the evolutionary fixation of frequent but nearly neutral mutations (e.g., synonymous codon substitutions).


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