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Updated: Dec 15, 2025

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

Gene Loss Predictably Drives Evolutionary Adaptation.

Jana Helsen^1,2,3, Karin Voordeckers^2,3, Laura Vanderwaeren^1,2,3

¹Laboratory of Predictive Genetics and Multicellular Systems, CMPG, KU Leuven, Leuven, Belgium.

Molecular Biology and Evolution

|July 14, 2020

Summary

This summary is machine-generated.

Gene loss, common in evolution, can surprisingly boost an organism's ability to adapt and evolve. While initially reducing fitness, yeast quickly regained it, sometimes surpassing original levels, demonstrating gene loss as an adaptive strategy.

Keywords:

adaptation evolvability experimental evolution fitness landscape genetic network oxidative stress

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Area of Science:

Evolutionary biology
Genetics
Molecular biology

Background:

Gene loss is a frequent evolutionary event, often associated with decreased organismal fitness.
Understanding the adaptive potential following gene deletion, particularly under stress, is crucial for evolutionary studies.

Purpose of the Study:

To systematically investigate how organisms adapt after losing genes critical for growth under oxidative stress.
To determine if gene loss can enhance an organism's evolvability and adaptive capacity.

Main Methods:

Evolutionary experiments involving over 200 yeast lineages.
High-throughput sequencing and detailed phenotyping of evolved mutants.
Analysis of genetic network modules and gene connectivity.

Main Results:

Gene loss, despite initial fitness reduction, can enhance adaptive evolution in yeast.
Suppressor mutations rapidly restored fitness in many gene deletion mutants.
Loss of highly connected genes promoted a wider diversity of adaptive phenotypes and increased evolvability.

Conclusions:

Specific gene deletions can facilitate adaptation by revealing alternative evolutionary pathways.
The genetic network's structure influences the trajectory and outcome of adaptation following gene loss.
Gene loss can be a significant driver of evolutionary innovation and adaptation.