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Related Experiment Video

Updated: Nov 1, 2025

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
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Proteomics support the threespine stickleback egg coat as a protective oocyte envelope.

Emily E Killingbeck1, Damien B Wilburn1, Gennifer E Merrihew1

  • 1Department of Genome Sciences, University of Washington, Seattle, Washington, USA.

Molecular Reproduction and Development
|June 20, 2021
PubMed
Summary

Threespine stickleback fish egg coats contain zona pellucida (ZP) proteins ZP1 and ZP3. Molecular evolution reveals ZP3 has undergone positive selection, suggesting adaptation in fish reproduction.

Keywords:
egg coatfertilizationreproductionsticklebackzona pellucida

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Area of Science:

  • Evolutionary Biology
  • Molecular Biology
  • Reproductive Biology

Background:

  • Threespine stickleback fish (Gasterosteus aculeatus) provide a model for studying adaptive radiation and speciation in freshwater environments.
  • Reproductive proteins involved in gamete recognition are crucial for fertilization but remain understudied in stickleback speciation.
  • Understanding these proteins can shed light on the molecular mechanisms driving reproductive isolation.

Purpose of the Study:

  • To characterize the egg coat proteome of threespine stickleback fish.
  • To investigate the role of reproductive proteins, specifically zona pellucida (ZP) proteins, in stickleback reproductive isolation and speciation.
  • To compare stickleback ZP protein evolution and structure with those of other vertebrates, particularly mammals.

Main Methods:

  • Proteomic analysis of the stickleback egg coat.
  • Molecular evolutionary analyses, including tests for positive Darwinian selection.
  • Comparative analysis of ZP protein structure, including glycosylation and disulfide bonding.

Main Results:

  • Stickleback egg coats contain homologs of zona pellucida (ZP) proteins ZP1 and ZP3, consistent with other teleosts.
  • Molecular evolutionary analyses indicate that stickleback ZP3, unlike ZP1, has experienced significant positive Darwinian selection.
  • Differences in glycosylation, disulfide bonding, and synthesis sites were observed between stickleback and mammalian ZP proteins, with some selected residues aligning.

Conclusions:

  • The evolution of ZP proteins, particularly ZP3, likely contributes to reproductive isolation and speciation in threespine stickleback fish.
  • Stickleback ZP proteins exhibit distinct architectural features compared to mammalian counterparts, suggesting a specialized functional role.
  • These findings suggest that fish egg coats may have evolved a more protective function than those of mammals.