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Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination
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Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination

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MAPRE2 regulates the first meiotic progression in mouse oocytes

Yuan-Yuan Li1, Wen-Long Lei1, Chang-Fa Zhang2

  • 1State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.

Experimental Cell Research
|April 10, 2022
PubMed

Insights

Microtubule-associated RP/EB family member 2 (MAPRE2) is crucial for mouse oocyte maturation. Its depletion disrupts microtubule stability and chromosome alignment, leading to meiotic failure.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Reproductive Biology

Background:

  • Microtubule plus-end tracking proteins (+TIPs) regulate microtubule dynamics and cellular processes.
  • MAPRE2 (EB2) is a core +TIP component, but its role in mammalian oocyte meiosis is uncharacterized.

Purpose of the Study:

  • To investigate the expression and function of MAPRE2 during mouse oocyte maturation.

Main Methods:

  • Quantitative analysis of MAPRE2 expression across oocyte maturation stages.
  • Immunofluorescence microscopy to determine MAPRE2 localization.
  • RNA interference (siRNA) to knockdown Mapre2 expression.
  • Assessment of microtubule stability, kinetochore-microtubule attachments, chromosome alignment, spindle assembly checkpoint (SAC) activation, and cyclin B1 degradation.

Main Results:

  • MAPRE2 is expressed throughout mouse oocyte maturation (GV to MII stages).
  • MAPRE2 localizes to the cytoplasm in GV oocytes and along the spindle in MI and MII oocytes.
  • Mapre2 knockdown severely impairs microtubule stability, kinetochore-microtubule attachment, and chromosome alignment.
  • MAPRE2 depletion activates the SAC and inhibits cyclin B1 degradation, causing meiotic arrest and failure of chromosome segregation and polar body extrusion.

Conclusions:

  • MAPRE2 is essential for proper microtubule organization and function during mouse oocyte meiosis.
  • MAPRE2 plays a critical role in ensuring accurate chromosome segregation and successful completion of oocyte maturation.
Keywords:
Chromosome segregationMAPRE2MeiosisSpindle assembly

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