Related Experiment Video
Updated: Mar 28, 2026
09:15
Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy
Published on: August 16, 2019
10.1K
The C. elegans eggshell
Kathryn K Stein1, Andy Golden1
1Laboratory of Biochemistry and Genetics, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
Wormbook : the Online Review of C. Elegans Biology
|December 31, 2015
Summary
The C. elegans eggshell, a crucial extracellular matrix, protects the developing embryo. Recent findings reveal its lipid-rich permeability barrier is separate from the outer layers, refining our understanding of its structure and formation.
Area of Science:
- Developmental Biology
- Cell Biology
- Reproductive Biology
Background:
- Oocytes in all animals are encased in an extracellular matrix after fertilization.
- This matrix is vital for sperm binding, preventing polyspermy, regulating the embryonic chemical environment, and providing physical protection.
- In C. elegans, eggshell synthesis initiates upon oocyte fertilization in the spermatheca.
Purpose of the Study:
- To delineate the distinct layers of the C. elegans eggshell.
- To identify key molecules involved in the hierarchical formation of the eggshell.
- To integrate recent findings on the lipid-rich permeability barrier into the eggshell structure model.
Main Methods:
- Literature review and synthesis of existing research on C. elegans eggshell formation.
- Analysis of ultrastructural and molecular data regarding eggshell layer composition.
- Comparative analysis of extracellular matrix functions across animal species.
Main Results:
- The C. elegans eggshell is a multi-layered structure completed by anaphase II of meiosis.
- Eggshell layers are synthesized hierarchically, with outer layers forming first.
- A distinct lipid-rich permeability barrier exists separately from the outer trilaminar eggshell.
Conclusions:
- Recent discoveries necessitate a revised understanding of the C. elegans eggshell's structure.
- Identifying the molecular players in each layer is crucial for understanding eggshell function.
- This chapter provides a comprehensive definition of eggshell layers and their constituent molecules.
