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Updated: Jun 12, 2026
09:16
Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
Published on: October 11, 2015
Clathrin is essential for meiotic spindle function in oocytes
Jurriaan J Hölzenspies1, Bernard A J Roelen, Ben Colenbrander
1Departments of Farm Animal Health Biochemistry and Cell Biology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
Reproduction (Cambridge, England)
|June 5, 2010
Summary
Clathrin associates with meiotic spindles in oocytes. Inhibiting clathrin disrupts chromosome alignment and polar body extrusion, revealing its crucial role in female meiosis.
Area of Science:
- Cell Biology
- Reproductive Biology
- Molecular Biology
Background:
- Oocytes arrest at prophase I until hormonal stimulus triggers meiotic maturation.
- Meiotic maturation is essential for oocyte fertilization competence.
- Clathrin stabilizes kinetochore fibers in mitotic spindles, but its role in meiotic spindles is unknown.
Purpose of the Study:
- Investigate the function of clathrin in mammalian oocyte meiotic maturation.
- Determine if clathrin associates with and stabilizes meiotic spindles.
Main Methods:
- Microinjection of dominant-negative clathrin constructs into porcine oocytes.
- In vitro maturation of oocytes.
- Observation of meiotic spindle organization and chromosome behavior using fluorescence microscopy.
Main Results:
- Endogenous clathrin was observed to associate with meiotic spindles.
- Dominant-negative clathrin constructs also localized to meiotic spindles.
- Clathrin inhibition resulted in chromosome misalignment, clumping, cytoplasmic chromatin, and failed polar body extrusion.
Conclusions:
- Clathrin plays a critical role in meiotic spindle function during oocyte maturation.
- Clathrin may stabilize meiotic spindles, ensuring proper chromosome segregation and developmental competence.
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