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Centrosomes regulate pronuclear apposition ensuring parental genome unification in cattle
Yuki Takada1, Shu Hashimoto1, Yoshiharu Morimoto2
1Reproductive Science Institute, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan.
Reproduction (Cambridge, England)
|September 29, 2025
Summary
The centrosome
Area of Science:
- Reproductive Biology
- Cell Biology
- Genetics
Background:
- Mammalian zygotes form male and female pronuclei after fertilization.
- Pronuclear apposition and genome unification are critical for development.
- Failure in genome unification can lead to developmental issues.
Purpose of the Study:
- To investigate the mechanism of pronuclear migration and genome unification.
- To determine the role of the centrosome in pronuclear apposition.
Main Methods:
- Immunofluorescence staining of fertilized bovine ova.
- Live imaging techniques to observe pronuclear dynamics.
- Analysis of microtubule and actin involvement in pronuclear movement.
Main Results:
- Microtubules are more critical than actin for pronuclear migration.
- Centrosomal microtubules regulate motor dynein localization on the pronuclear membrane.
- A centrosome positioned between pronuclei is essential for their apposition and genome unification.
Conclusions:
- Centrosome positioning is a key regulatory factor in pronuclear apposition.
- Proper centrosome placement is necessary for successful parental genome unification.
- This study elucidates a critical step in early mammalian development.
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