Related Experiment Video
Updated: Aug 11, 2026
Visualization of Caenorhabditis elegans Cuticular Structures Using the Lipophilic Vital Dye DiI
Published on: January 30, 2012
Mutations with sensory ray defect unmask cuticular glycoprotein antigens in Caenorhabditis elegans male tail
1Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, China.
Abstract:
Caenorhabditis elegans male tail has nine pairs of bilaterally symmetric ray processes extended into a cuticular fan. The formation of these structures involves both cell lineage differentiation and cellular morphogenesis. Nine mutations were examined, all of which presented an amorphous ray phenotype. Glycoconjugates carrying an N-acetylglucosamine (GlcNAc) epitope were detected at a high level in their male bursa. It was shown that these antigens are not responsible for the morphological defects. It was further demonstrated that these ram and mab gene products represent critical components for male tail cuticle organization. Mutations of them abolish the integrity of the male bursal cuticle and unmask the underlying GlcNAc epitope.
Insights
Mutations in ram and mab genes disrupt Caenorhabditis elegans male tail development. These gene products are essential for organizing the male tail cuticle, and their absence exposes underlying N-acetylglucosamine epitopes.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Cellular Biology
Background:
- The Caenorhabditis elegans male tail features complex structures, including ray processes and a cuticular fan, essential for reproduction.
- Formation of these structures relies on precise cell lineage differentiation and cellular morphogenesis.
- Understanding the genetic basis of male tail development is crucial for insights into developmental processes.
Purpose of the Study:
- To investigate the function of specific genes in the organization and integrity of the C. elegans male tail cuticle.
- To determine the role of ram and mab gene products in male tail morphogenesis and cuticle formation.
- To explore the relationship between gene mutations, cuticle defects, and the exposure of specific glycoantigens.
Main Methods:
- Analysis of nine mutations affecting C. elegans male tail development, specifically those resulting in an amorphous ray phenotype.
- Detection and localization of N-acetylglucosamine (GlcNAc) epitopes in the male bursa using immunochemical methods.
- Comparative analysis of wild-type and mutant phenotypes to elucidate gene functions in cuticle organization.
Main Results:
- Nine mutations led to an amorphous ray phenotype in the C. elegans male tail.
- High levels of N-acetylglucosamine (GlcNAc) epitopes were detected in the male bursa of mutants, but these were not the cause of the defects.
- Ram and mab gene products were identified as critical components for male tail cuticle organization; mutations abolished cuticle integrity and unmasked GlcNAc epitopes.
Conclusions:
- Ram and mab gene products play essential roles in the structural organization and integrity of the male tail cuticle in C. elegans.
- Disruption of these genes leads to severe defects in male tail morphogenesis, characterized by cuticle disorganization.
- The unmasking of GlcNAc epitopes in mutant males highlights the importance of proper cuticle formation for cellular structure.
