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Updated: Feb 14, 2026
12:02
Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
10.1K
Faster-X evolution: Theory and evidence from Drosophila
Brian Charlesworth1, José L Campos1, Benjamin C Jackson1
1Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK.
Molecular Ecology
|February 13, 2018
Summary
Adaptive evolution is faster for X-linked genes than autosomal genes, especially in males. This "faster-X" effect is supported by population genetics theory and Drosophila genomic data, suggesting unique evolutionary pressures on sex chromosomes.
Area of Science:
- Evolutionary Biology
- Genetics
- Population Genomics
Background:
- X-linked genes evolve faster than autosomal genes due to male hemizygosity.
- Recombination and mutation rate differences may also contribute to faster X-linked gene evolution.
Purpose of the Study:
- To review population genetics theory on X-linked vs. autosomal DNA sequence evolution.
- To compare theoretical predictions with empirical data from Drosophila population genomics.
Main Methods:
- Review of population genetics theory.
- Analysis of population genomic data from Drosophila species.
Main Results:
- Evidence supports faster-X adaptive evolution for functionally significant nucleotides.
- Potential differences in mutation rates (GC to AT bias) between X-linked and autosomal genes observed.
- Data largely consistent with the male hemizygosity model.
Conclusions:
- Male hemizygosity is a significant factor in faster-X evolution.
- Differences in mutation rates may also play a role.
- Further research needed to exclude all confounding factors.
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