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RNA kinase CLP1/Cbc regulates meiosis initiation in spermatogenesis
Jianbo Wu1,2, Xin Li1, Zhiyang Gao1
1State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, BeiChenXiLu#1, Beijing 100101, P.R. China.
Abstract:
CLP1, TSEN complex, and VCP are evolutionarily conserved proteins whose mutations are associated with neurodegenerative diseases. In this study, we have found that they are also involved in germline differentiation. To optimize both quantity and quality in gametes production, germ cells expand themselves through limited mitotic cycles prior to meiosis. Stemming from our previous findings on the correlation between mRNA 3'-processing and meiosis entry, here we identify that the RNA kinase Cbc, the Drosophila member of the highly conserved CLP1 family, is a component of the program regulating the transition from mitosis to meiosis. Using genetic manipulations in Drosophila testis, we demonstrate that nuclear Cbc is required to promote meiosis entry. Combining biochemical and genetic methods, we reveal that Cbc physically and/or genetically intersects with Tsen54 and TER94 (VCP ortholog) in this process. The C-terminal half of Tsen54 is both necessary and sufficient for its binding with Cbc. Further, we illustrate the functional conservation between Cbc and mammalian CLP1 in the assays of subcellular localization and Drosophila fertility. As CLP1, TSEN complex, and VCP have also been identified in neurodegenerations of animal models, a mechanism involving these factors seems to be shared in gametogenesis and neurogenesis.
Insights
The RNA kinase Cbc, a CLP1 family member, is crucial for germline stem cell progression to meiosis in Drosophila. This protein interacts with TSEN complex and VCP, suggesting a conserved mechanism in gametogenesis and neurogenesis.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- CLP1, TSEN complex, and VCP are conserved proteins linked to neurodegenerative diseases.
- These proteins are implicated in germline differentiation, essential for gamete production.
- Germ cells undergo mitotic cycles before meiosis to optimize quantity and quality.
Purpose of the Study:
- To investigate the role of the RNA kinase Cbc in regulating the transition from mitosis to meiosis in Drosophila germline.
- To identify interactions between Cbc, TSEN complex, and VCP during germline differentiation.
- To explore the functional conservation of Cbc and mammalian CLP1.
Main Methods:
- Genetic manipulations in Drosophila testis.
- Biochemical assays to determine protein interactions.
- Subcellular localization studies.
- Drosophila fertility assays.
Main Results:
- Nuclear Cbc is essential for promoting meiosis entry in Drosophila germ cells.
- Cbc physically and genetically interacts with Tsen54 and TER94 (VCP ortholog).
- The C-terminal region of Tsen54 mediates binding with Cbc.
- Cbc demonstrates functional conservation with mammalian CLP1.
Conclusions:
- The RNA kinase Cbc plays a vital role in the mitosis-to-meiosis transition in the germline.
- A conserved molecular mechanism involving CLP1, TSEN complex, and VCP is shared between gametogenesis and neurogenesis.
- These findings provide insights into the molecular basis of both fertility and neurodegenerative diseases.
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