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Mutation Accumulation in a Selfing Population: Consequences of Different Mutation Rates between Selfers and Outcrossers

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  • Shin-Ichiro Nakayama
  • Shoi Shi
  • Masaki Tateno
  • Masakazu Shimada
  • K Ryo Takahasi

Abstract

Currently existing theories predict that because deleterious mutations accumulate at a higher rate, selfing populations suffer from more intense genetic degradation relative to outcrossing populations. This prediction may not always be true when we consider a potential difference in deleterious mutation rate between selfers and outcrossers. By analyzing the evolutionary stability of selfing and outcrossing in an infinite population, we found that the genome-wide deleterious mutation rate would be lower in selfing than in outcrossing organisms. When this difference in mutation rate was included in simulations, we found that in a small population, mutations accumulated more slowly under selfing rather than outcrossing. This result suggests that under frequent and intense bottlenecks, a selfing population may have a lower risk of genetic extinction than an outcrossing population.

Suggested Citation

  • Shin-Ichiro Nakayama & Shoi Shi & Masaki Tateno & Masakazu Shimada & K Ryo Takahasi, 2012. "Mutation Accumulation in a Selfing Population: Consequences of Different Mutation Rates between Selfers and Outcrossers," PLOS ONE, Public Library of Science, vol. 7(3), pages 1-6, March.
    • Handle: RePEc:plo:pone00:0033541
    DOI: 10.1371/journal.pone.0033541
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