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04:52
Following the Dynamics of Structural Variants in Experimentally Evolved Populations
Published on: February 3, 2023
Recombination and the evolution of coordinated phenotypic expression in a frequency-dependent game
Michal Arbilly1, Uzi Motro, Marcus W Feldman
1Department of Zoology, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel. michala@stanford.edu
Theoretical Population Biology
|September 28, 2011
Summary
Adaptive trait combinations can persist despite recombination. A genetic switch mechanism, rather than strong epistasis or reduced recombination, facilitates the evolution of these trait associations in populations.
Area of Science:
- Evolutionary Biology
- Population Genetics
- Theoretical Ecology
Background:
- Maintaining adaptive trait combinations in sexually reproducing populations is a challenge due to recombination.
- Strong positive epistasis can favor reduced recombination, but this requires high epistasis levels.
- Previous models showed adaptive associations between foraging strategies and learning in asexual populations.
Purpose of the Study:
- To investigate mechanisms maintaining adaptive trait combinations in the presence of recombination when epistasis is weak.
- To test if genetic linkage or alternative mechanisms explain trait association evolution under weak epistasis.
Main Methods:
- Utilized a previously developed model for frequency-dependent strategy games in asexual populations.
- Analyzed the evolution of adaptive associations between social foraging strategies and learning rules under recombination.
- Investigated the role of modifier alleles reducing recombination rates and genetic switch mechanisms.
Main Results:
- Adaptive associations (two-locus haplotypes) are easily disrupted by genetic recombination.
- Modifier alleles that reduce recombination rates do not evolve due to weak epistasis.
- A genetic switch mechanism, coordinating phenotypic expression, allows adaptive trait associations to evolve under weak epistasis.
Conclusions:
- Weak epistasis prevents selection for reduced recombination as a mechanism for maintaining adaptive traits.
- Genetic switches provide an alternative, robust pathway for the evolution of coordinated traits despite recombination.
- This genetic switch mechanism offers a general solution for maintaining adaptive trait combinations in sexual populations.
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