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Related Experiment Videos

Escherichia coli mutators: selection criteria and migration effect.

Ludovic Le Chat1, Michel Fons2, Francois Taddei1

  • 1University of Paris 5, Faculty of Medicine, INSERM, U571, F-75730 Paris 15, France.

Microbiology (Reading, England)
|December 31, 2005
PubMed
Summary

Mutator alleles, which increase mutation rates, can be selected for adaptive mutations. Their advantage depends on the ratio of beneficial mutations in mutator versus wild-type bacteria, not frequency.

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Area of Science:

  • Evolutionary biology
  • Microbial genetics

Background:

  • Mutator alleles increase mutation rates and can be advantageous for adaptation.
  • Previous studies suggest mutator advantage is frequency-dependent and reduced by migration in vivo.

Purpose of the Study:

  • To investigate the selection dynamics of mutator bacteria in vitro.
  • To determine if mutator selection is frequency-dependent.
  • To quantify the factors influencing mutator gain.

Main Methods:

  • Utilized an in vitro experimental system.
  • Compared the performance of wild-type and mutator bacterial strains.
  • Analyzed the frequency of adaptive mutations in different lineages.

Main Results:

Related Experiment Videos

  • Mutator selection was found to be frequency-independent.
  • Mutator advantage depends on the presence of adaptive mutations within the mutator population.
  • Mutator gain is directly proportional to the ratio of adaptive mutation frequencies between mutator and wild-type bacteria.
  • Migration into an empty niche reduced mutator benefit if it occurred after adaptive mutation fixation in wild-type.

    • Conclusions:

    • Mutator gain is consistently linked to the relative frequency of beneficial mutations in mutator versus wild-type lineages.
    • The presence of at least one mutator bacterium with an adaptive mutation is crucial for selection.
    • Environmental factors like migration timing can modulate mutator benefits.