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Selfish chromosomes exploit a germline checkpoint to eliminate competing gametes
Jackson T Ridges1, Jackson Bladen1, Thomas D King1
1School of Biological Sciences, University of Utah, Salt Lake City, UT, USA.
Nature Communications
|January 10, 2026
Summary
Overdrive (Ovd) gene acts as a male germline checkpoint, eliminating abnormal sperm during development. This checkpoint is exploited by selfish chromosomes to remove competing sperm, revealing a common mechanism across Drosophila species.
Area of Science:
- Reproductive biology
- Genetics
- Developmental biology
Background:
- Spermatid individualization is a critical stage in sperm development where failures can indicate a male germline checkpoint.
- The molecular basis of such a checkpoint in Drosophila has not been identified.
Purpose of the Study:
- To identify the molecular components of a male germline checkpoint during spermiogenesis in Drosophila.
- To investigate the role of the Overdrive (Ovd) gene in gamete elimination and its interaction with selfish genetic elements.
Main Methods:
- Analysis of spermatid individualization defects in Drosophila mutants.
- Investigating the function of the Overdrive (Ovd) gene in the context of selfish chromosome behavior.
- Comparative analysis across different Drosophila species.
Main Results:
- The Overdrive (Ovd) gene, normally dispensable for male fertility, is essential for eliminating post-meiotic spermatids targeted by selfish chromosomes.
- Gamete elimination occurs during spermiogenesis, specifically after failure in histone-to-protamine transition in targeted spermatids.
- Ovd is crucial for the function of segregation distorters in various Drosophila species, indicating conserved mechanisms.
Conclusions:
- The Overdrive (Ovd) gene mediates a male germline checkpoint that eliminates abnormal gametes during sperm development.
- Selfish chromosomes have evolved to hijack the Ovd-mediated checkpoint to eliminate competing sperm, ensuring their own transmission.
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