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Related Experiment Video

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Evolution of drift robustness in small populations.

Thomas LaBar^1,2,3, Christoph Adami^4,5,6,7

¹Department of Microbiology & Molecular Genetics, Michigan State University, East Lansing, MI, 48824, USA.

Nature Communications

|October 19, 2017

Summary

Small populations evolve "drift robustness," reducing vulnerability to genetic drift. This occurs because they maintain fitness on robust fitness peaks, not through adaptation.

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Area of Science:

Evolutionary biology
Population genetics

Background:

Mutations typically reduce population fitness (mutational load).
Small populations experience weakened selection against slightly deleterious mutations, increasing fitness loss.
While populations can evolve mutational robustness, it's unclear if small populations can reduce susceptibility to drift-related fitness declines.

Purpose of the Study:

To investigate whether small populations evolve reduced vulnerability to genetic drift (drift robustness).
To determine the mechanisms and adaptive significance of drift robustness.

Main Methods:

Mathematical modeling
Digital experimental evolution

Main Results:

Small populations evolve drift robustness, decreasing their vulnerability to drift.
Genotypes from small populations have fewer small-effect deleterious mutations than those from large populations.
Drift robustness arises not from adaptation but from small populations maintaining fitness on robust fitness peaks.

Conclusions:

Small populations are inherently drift-robust.
This robustness is a consequence of evolutionary constraints in small populations.
Findings impact understanding of genome evolution in species with small effective population sizes.