Differential regulation of germ line apoptosis and germ cell differentiation by CPEB family members in C. elegans
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Updated: Feb 25, 2026
Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
Published on: April 19, 2018
Kapil Dev Singh1,2, Xue Zheng1,2, Stuart Milstein3
1Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland.
Abstract:
Cytoplasmic polyadenylation element binding (CPEB) proteins are evolutionary conserved RNA-binding proteins that control mRNA polyadenylation and translation. Orthologs in humans and other vertebrates are mainly involved in oogenesis. This is also the case for the C. elegans CPEB family member CPB-3, whereas two further CPEB proteins (CPB-1 and FOG-1) are involved in spermatogenesis. Here we describe the characterisation of a new missense allele of cpb-3 and show that loss of cpb-3 function leads to an increase in physiological germ cell death. To better understand the interaction and effect of C. elegans CPEB proteins on processes such as physiological apoptosis, germ cell differentiation, and regulation of gene expression, we characterised changes in the transcriptome and proteome of C. elegans CPEB mutants. Our results show that, despite their sequence similarities CPEB family members tend to have distinct overall effects on gene expression (both at the transcript and protein levels). This observation is consistent with the distinct phenotypes observed in the various CPEB family mutants.
Insights
Cytoplasmic polyadenylation element binding (CPEB) proteins regulate gene expression. Loss of C. elegans cpb-3 increases germ cell death, and CPEB proteins have distinct effects on gene expression.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Cytoplasmic polyadenylation element binding (CPEB) proteins are conserved RNA-binding proteins controlling mRNA polyadenylation and translation.
- In vertebrates, CPEB proteins are primarily involved in oogenesis, while in C. elegans, CPB-3 is involved in oogenesis, and CPB-1 and FOG-1 in spermatogenesis.
Purpose of the Study:
- To characterize a new missense allele of cpb-3 and its effect on physiological germ cell death.
- To understand the interaction and effects of C. elegans CPEB proteins on apoptosis, germ cell differentiation, and gene expression regulation.
Main Methods:
- Characterization of a new missense allele of cpb-3.
- Transcriptome and proteome analysis of C. elegans CPEB mutants.
Main Results:
- Loss of cpb-3 function results in increased physiological germ cell death.
- Despite sequence similarities, C. elegans CPEB family members exhibit distinct effects on gene expression at both transcript and protein levels.
- These distinct effects on gene expression correlate with observed differences in CPEB family mutant phenotypes.
Conclusions:
- C. elegans CPEB proteins play distinct roles in germ cell biology and gene expression regulation.
- CPB-3 is crucial for regulating physiological germ cell death in C. elegans.
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