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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Published on: February 3, 2023

How does adaptation sweep through the genome? Insights from long-term selection experiments.

Molly K Burke1

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525, USA. burkem@uci.edu

Proceedings. Biological Sciences
|July 27, 2012
PubMed
Summary

Experimental evolution reveals that beneficial mutations, whether new or standing, don't always reach fixation. Understanding these adaptive processes requires studying population biology and environmental factors.

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Area of Science:

  • Evolutionary biology
  • Genetics

Background:

  • Understanding the origin and fate of adaptive mutations is key in evolutionary biology.
  • Natural selection drives the frequency increase of beneficial mutations, either de novo or from standing genetic variation.
  • Factors influencing adaptive processes remain incompletely understood.

Purpose of the Study:

  • To review findings from whole-genome sequencing of laboratory-selected populations.
  • To explore the dynamics of beneficial alleles in experimental evolution systems.
  • To investigate the fixation patterns of new versus standing mutations.

Main Methods:

  • Analysis of whole-genome sequencing data from experimental evolution studies.
  • Comparison of adaptation dynamics in asexual and sexual systems.
  • Review of existing literature on resequenced laboratory-selected populations.

Main Results:

  • In asexual systems, adaptation from new mutations is observed, but complete fixation is not always achieved.
  • In sexual systems, adaptation from standing genetic variation occurs, yet fixation is also not guaranteed.
  • Few studies have directly compared adaptation from new versus standing variation.

Conclusions:

  • Experimental evolution provides insights into adaptive mutation dynamics relevant to natural populations.
  • The fixation of beneficial mutations is complex and influenced by various factors.
  • Future research aims to directly test the relative contributions of new and standing mutations to adaptation.