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Related Experiment Video

Updated: Feb 27, 2026

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

Mutational Biases Influence Parallel Adaptation.

Arlin Stoltzfus¹, David M McCandlish²

¹Genome-scale Measurements Group, Material Measurement Laboratory, NIST, and Institute for Bioscience and Biotechnology Research, Rockville, MD 20850, USA.

Molecular Biology and Evolution

|June 25, 2017

Summary

This summary is machine-generated.

Mutational biases significantly impact molecular evolution. This study reveals that transitions, a common type of mutation, are overrepresented in adaptive substitutions, suggesting mutation biases shape the course of evolution.

Keywords:

experimental evolution mutation-biased adaptation parallelism transition-transversion bias

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Area of Science:

Molecular Biology
Evolutionary Biology
Genetics

Background:

Mutational biases are known to influence neutral molecular evolution.
The effect of mutational biases on adaptive evolution remains less understood.
Transitions are generally more frequent than transversions in mutations.

Purpose of the Study:

To investigate the role of mutational biases in adaptive evolution.
To determine if transitions are overrepresented among adaptive substitutions.
To test the hypothesis that mutation biases influence the dynamics of adaptation.

Main Methods:

Assembled two datasets of putatively adaptive amino acid replacements.
Analyzed parallel evolutionary changes occurring in nature and in the laboratory.
Compared the observed frequency of transitions to a null model without mutational effects.

Main Results:

Transitions were found to be significantly overrepresented in adaptive substitutions.
This overrepresentation was observed in both natural and laboratory evolution datasets.
Results remained consistent even when analyzing changes occurring three or more times.

Conclusions:

Mutational biases, specifically the higher rate of transitions, appear to bias the course of adaptation.
The findings suggest that mutation is not a neutral force in adaptive evolution.
The study provides evidence for the influence of mutation spectrum on evolutionary trajectories.