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The SPN-4 Rbfox RNA-binding protein selects maternal mRNAs for CCR4-NOT-dependent clearance in early Caenorhabditis
Caroline A Spike1, Dylan M Parker2,3,4, Tatsuya Tsukamoto1
1Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA.
Development (Cambridge, England)
|June 2, 2026
Summary
Maternal mRNA clearance is vital for embryonic development. A new pathway uses SPN-4 protein to target specific maternal transcripts for degradation by the CCR4-NOT complex, ensuring proper development in C. elegans embryos.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Maternal mRNA elimination is crucial for the maternal-to-zygotic transition in early embryogenesis.
- Understanding the mechanisms regulating maternal mRNA decay is key to deciphering developmental control.
Purpose of the Study:
- To identify the molecular pathway responsible for clearing maternal transcripts during the maternal-to-zygotic transition in C. elegans.
- To elucidate the roles of the SPN-4 RNA-binding protein and the CCR4-NOT deadenylase complex in this process.
Main Methods:
- Biochemical identification of SPN-4-associated mRNAs in oocytes.
- Single-molecule fluorescence in situ hybridization (smFISH) to assess mRNA clearance.
- In vitro binding assays and in vivo experiments to analyze RNA-binding protein interactions and functional requirements.
- Genetic screening to identify interacting factors.
Main Results:
- SPN-4 protein specifically binds to maternal mRNAs containing Rbfox motifs in their 3'UTRs.
- SPN-4 is essential for the timely clearance of these target maternal mRNAs in early embryos.
- Components of the CCR4-NOT deadenylase complex, including NOT1 and CCF-1, are required for SPN-4-mediated mRNA decay.
- Disruption of SPN-4 or CCR4-NOT components impairs maternal mRNA elimination.
Conclusions:
- SPN-4 acts as a specificity factor, targeting maternal mRNAs for degradation.
- The CCR4-NOT complex serves as the effector, degrading SPN-4-bound maternal transcripts.
- This pathway is critical for regulating the maternal-to-zygotic transition and ensuring proper embryonic development in C. elegans.
