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Related Experiment Videos

Pervasive adaptive evolution in mammalian fertilization proteins.

Willie J Swanson1, Rasmus Nielsen, Qiaofeng Yang

  • 1Department of Genome Sciences, University of Washington, USA. wswanson@gs.washington.edu

Molecular Biology and Evolution
|January 10, 2003
PubMed
Summary

Positive Darwinian selection drives the rapid evolution of mammalian fertilization proteins. This study identifies seven key genes, including sperm proteins, subject to this selection, suggesting widespread adaptive evolution in reproduction.

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Area of Science:

  • Evolutionary biology
  • Reproductive science
  • Genomics

Background:

  • Mammalian fertilization involves species-specific sperm-egg interactions mediated by rapidly evolving proteins.
  • Previous studies indicated positive selection on zona pellucida glycoproteins, a component of the mammalian egg coat.

Purpose of the Study:

  • To investigate the role of positive Darwinian selection in the evolution of seven genes crucial for mammalian fertilization.
  • To refine tests for positive selection by assessing if the d(N)/d(S) ratio is significantly greater than one.

Main Methods:

  • Utilized likelihood ratio tests (LRTs) to analyze the evolutionary patterns of seven mammalian fertilization genes.
  • Implemented a new LRT to specifically test if the d(N)/d(S) ratio significantly exceeds one.

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Main Results:

  • Demonstrated that positive Darwinian selection promotes the evolution of seven mammalian fertilization genes.
  • Identified several sperm proteins binding to zona pellucida glycoproteins as being under positive selection.
  • Indicated that positive selection is a pervasive force acting on mammalian reproductive proteins.

Conclusions:

  • Positive selection is a significant driver of evolution in genes involved in mammalian fertilization.
  • Sperm-egg interaction proteins, particularly those binding the zona pellucida, are key targets of adaptive evolution.
  • The findings suggest a broad pattern of pervasive positive selection across mammalian reproductive proteins.