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Asymmetric sequence divergence of duplicate genes.

Gavin C Conant1, Andreas Wagner

  • 1Department of Biology, The University of New Mexico, Albuquerque, New Mexico 87131, USA. gconant@unm.edu

Genome Research
|September 4, 2003
PubMed
Summary

Gene duplicates often evolve differently, with one copy diverging faster than the other. This asymmetric evolution in gene duplicates is frequently driven by relaxed selection, but positive selection may also contribute.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular evolution

Background:

  • Gene duplication is a fundamental evolutionary process.
  • Duplicate genes can acquire new functions or evolve through various mechanisms.
  • Understanding the evolutionary trajectories of gene duplicates is crucial for deciphering genome evolution.

Purpose of the Study:

  • To investigate the prevalence and drivers of asymmetric evolution in duplicate genes.
  • To analyze the relationship between evolutionary rate asymmetry and selective pressures.
  • To develop a sensitive method for detecting positive selection in gene duplicates.

Main Methods:

  • Analysis of four completely sequenced genomes.
  • Application of a codon-based model of molecular evolution.
  • Testing for asymmetric divergence in the ratio of amino acid to silent substitutions (Ka/Ks).

Main Results:

  • 20%-30% of duplicate gene pairs exhibit asymmetric amino acid sequence evolution.
  • Greater evolutionary asymmetry correlates with a higher Ka/Ks ratio, suggesting relaxed selective constraints.
  • Evidence suggests positive selection may also contribute to asymmetric divergence in some gene duplicates.

Conclusions:

  • Asymmetric evolution is a common feature of duplicate genes.
  • Relaxed selective constraints are a primary driver of this asymmetry.
  • The developed codon-based model offers enhanced sensitivity for detecting positive selection in duplicate genes.

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