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Asymmetric Context-Dependent Mutation Patterns Revealed through Mutation-Accumulation Experiments.

Way Sung1, Matthew S Ackerman2, Jean-François Gout2

  • 1Department of Biology, Indiana University, Bloomington waysung@indiana.edu.

Molecular Biology and Evolution
|March 10, 2015
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Summary
This summary is machine-generated.

Mutation rates are not random; they depend on neighboring DNA sequences. This context-dependent mutation pattern, observed across bacteria, significantly impacts genome evolution and selection interpretations.

Keywords:
Bacillus subtiliscontext-dependent mutationmismatch repairmutation rate

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • The assumption of uniform site-specific mutation rates is being challenged.
  • Local DNA sequence context is increasingly recognized as a factor influencing mutation.

Purpose of the Study:

  • To investigate context-dependent mutation patterns in bacterial genomes.
  • To analyze how sequence context affects mutation rates across different species and mismatch repair statuses.

Main Methods:

  • Accumulation of spontaneous mutations in wild-type and mismatch-repair deficient (MMR(-)) Bacillus subtilis lines.
  • Analysis of over 7,500 spontaneous base-substitution mutations in Bacillus subtilis, Escherichia coli, and Mesoplasma florum.

Main Results:

  • A context-dependent mutation pattern was identified, showing asymmetry around the origin of replication.
  • Neighboring nucleotides can modulate site-specific mutation rates up to 75-fold.
  • Elevated mutation rates were observed at sites neighboring G:C base pairs and specific alternating nucleotide dimers.

Conclusions:

  • Context-dependent mutation significantly influences genome architecture, particularly in organisms with low effective population sizes like M. florum.
  • Failure to account for context-dependent mutation can lead to misinterpretations of selection pressures (positive and purifying).