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Related Experiment Video

Updated: Jun 18, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Coalescent under the evolution of coadaptation.

K Ryo Takahasi¹

¹Department of Population Genetics, Institute of Genetics, Misima, Japan. kenzi.z56@gmail.com

Molecular Ecology

|November 17, 2009

Summary

Epistasis can convert neutral mutations into beneficial ones, driving adaptation. The timing of these mutations leaves distinct genetic footprints, revealing hidden evolutionary processes.

Area of Science:

Evolutionary genetics
Population genetics
Molecular evolution

Background:

Adaptation to new environments can involve new mutations or existing genetic variation.
Environmental changes can alter allele fitness or epistatic interactions can reclassify neutral mutations as beneficial.

Purpose of the Study:

Investigate the hitchhiking effect of epistatic selection on sequence diversity.
Analyze genealogical histories of two interacting loci using coalescent theory.

Main Methods:

Extended coalescent theory to model genealogical histories of two interacting loci.
Assumed epistasis between two independently neutral mutations forming a coadapted haplotype.

Main Results:

Epistatic selection leaves distinct footprints on linked neutral regions, varying by the order and timing of mutations.

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The impact on sequence diversity differs between interacting loci despite equal importance for adaptation.

Conclusions:

Hidden mutations play crucial roles in adaptation, even if undetected by neutrality tests.
Integrating coalescent framework with polygenic inheritance theory can illuminate DNA sequence changes driving phenotypic evolution and coadapted systems.