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Updated: Mar 1, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
Published on: February 3, 2023
ON THE EFFECT OF FOUNDER EVENTS ON EPISTATIC GENETIC VARIANCE
1Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, 60680.
Founder events impact genetic variance, decreasing additive variance but increasing epistatic variance within populations. Epistasis becomes crucial for evolution in multiple founder events, potentially driving genetic revolutions.
Area of Science:
- Evolutionary genetics
- Population genetics
Background:
- Founder events can lead to genetic revolutions by altering genetic variability.
- Epistasis, gene interactions, may play a significant role in founder event dynamics.
Purpose of the Study:
- To theoretically investigate the distribution of epistatic variance after founder events.
- To analyze the impact of single and multiple founder events on genetic variance components.
Main Methods:
- Utilized measures of coancestry to model additive-by-additive epistasis.
- Calculated variance components within and among demes using ancestral population data.
Main Results:
- Single founder events decrease relative additive variance but increase relative epistatic variance within demes.
- Epistatic and additive variances contribute similarly among demes after a single founder event.
- Multiple founder events significantly amplify epistatic variance among demes compared to additive variance.
Conclusions:
- Epistatic variance is less likely to cause genetic revolutions after single founder events than additive variance.
- Epistasis gains significant evolutionary importance with continued drift through multiple founder events.
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