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Muller's ratchet under epistatic selection

A S Kondrashov1

  • 1Section of Ecology and Systematics, Cornell University, Ithaca, New York 14853.

Genetics
|April 1, 1994
PubMed
Summary

Muller's ratchet, a process of declining fitness in asexual populations, can be halted by synergistic epistasis. This genetic interaction prevents the loss of beneficial genotypes, allowing populations to persist indefinitely.

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Muller's ratchet describes fitness decline in asexual populations due to the accumulation of deleterious mutations.
  • Previous models assumed independent effects of these mutations, predicting constant or increasing rates of decline.

Purpose of the Study:

  • To investigate the impact of synergistic epistasis on Muller's ratchet.
  • To determine if genetic interactions can alter the long-term survival of asexual populations.

Main Methods:

  • Theoretical analysis of genetic drift and selection in finite asexual populations.
  • Modeling the effects of synergistic epistasis on allele frequencies and fitness.

Main Results:

  • Synergistic epistasis between deleterious alleles can effectively halt Muller's ratchet.
  • The best available genotype becomes less likely to be lost as the ratchet advances.
  • Asexual populations can persist indefinitely, albeit with reduced mean fitness.

Conclusions:

  • The assumption of independent mutation effects is critical for understanding Muller's ratchet.
  • Synergistic epistasis provides a mechanism for the long-term survival of asexual lineages.
  • Epistasis can significantly alter evolutionary trajectories and population persistence.

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