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Related Experiment Video

Updated: Jun 7, 2026

Isolation and In vitro Activation of Caenorhabditis elegans Sperm
05:46

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Published on: January 31, 2011

Eggshell chitin and chitin-interacting proteins prevent polyspermy in C. elegans.

Wendy L Johnston1, Aldis Krizus, James W Dennis

  • 1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, ON M5G 1X5, Canada.

Current Biology : CB
|October 26, 2010
PubMed
Summary

Eggshell chitin is essential for preventing polyspermy in C. elegans. Loss of chitin synthesis or related proteins compromises the eggshell, leading to multiple sperm fertilizations and developmental defects.

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Last Updated: Jun 7, 2026

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Published on: April 19, 2018

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Fertilization in Caenorhabditis elegans occurs in a sperm-rich environment, necessitating a robust polyspermy barrier.
  • Eggshell formation, including chitin synthesis, begins at fertilization and is crucial for early embryonic development.

Purpose of the Study:

  • To investigate the role of eggshell chitin in preventing polyspermy during fertilization in C. elegans.
  • To identify genes and proteins involved in chitin synthesis and eggshell integrity essential for blocking multiple sperm.

Main Methods:

  • Genetic analysis of mutants deficient in chitin synthesis (CHS-1, UDP-N-acetylglucosamine) and associated proteins (EGG-3, SPE-11).
  • Investigated the function of chitin-binding protein (CBD-1) and LDL receptor-like proteins (EGG-1, EGG-2) in eggshell formation.
  • Microscopic analysis of eggshell structure and protein localization (CHS-1, MBK-2, EGG-3) in wild-type and mutant strains.

Main Results:

  • Chitin deficiency, caused by mutations in CHS-1, UDP-N-acetylglucosamine, EGG-3, or SPE-11, resulted in 14%-51% polyspermy.
  • Loss of CBD-1 or EGG-1/2 disrupted the cortical distribution of key proteins (CHS-1, MBK-2, EGG-3), leading to fractured eggshells.
  • SPE-11 mutants showed incomplete chitin layer formation, compromising the polyspermy barrier.

Conclusions:

  • Eggshell chitin plays a critical role in establishing the polyspermy barrier in C. elegans.
  • Proper assembly and integrity of the chitin eggshell are essential for preventing multiple fertilization events.
  • These findings expand the known functions of eggshell chitin beyond polar body extrusion and zygote polarization.