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Epistasis01:39

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Should evolutionary geneticists worry about higher-order epistasis?

Daniel M Weinreich1, Yinghong Lan, C Scott Wylie

  • 1Department of Ecology and Evolutionary Biology, and Center for Computational Molecular Biology, Brown University, Box G-W, Providence, RI 02912, USA.

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Higher-order epistasis, interactions among multiple mutations, is prevalent in evolutionary genetics. This study generalizes epistasis analysis, revealing its significant role in shaping fitness landscapes and evolution.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Genomics

Background:

  • Natural selection guides evolution on fitness landscapes.
  • Fitness landscape complexity arises from epistatic interactions between mutations.
  • Previous studies primarily focused on pairwise epistasis.

Purpose of the Study:

  • To generalize the classical population genetic treatment of epistasis.
  • To develop methods for quantifying epistasis of all orders (pairwise, three-way, etc.).
  • To assess the prevalence and importance of higher-order epistasis.

Main Methods:

  • Generalized classical population genetic models for epistasis.
  • Developed mathematical expressions for arbitrary order epistasis.
  • Analyzed published fitness landscape data.
  • Empirically validated findings in model systems.

Main Results:

  • Higher-order epistasis was detected in nearly all analyzed fitness landscapes.
  • The study provides a generalized framework for epistasis analysis.
  • Higher-order epistasis plays a critical role in studied biological systems.

Conclusions:

  • Higher-order epistasis is a substantial and widespread phenomenon in evolution.
  • Current focus on pairwise epistasis may overlook crucial evolutionary dynamics.
  • Further empirical and theoretical research on higher-order epistasis is warranted for evolutionary geneticists.