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Condensin dysfunction is a reproductive isolating barrier in mice.

Warif El Yakoubi1, Takashi Akera2

  • 1Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.

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|November 2, 2023
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Summary

Genetic incompatibilities between mouse species cause hybrid female sterility. This occurs due to chromosome decondensation and mis-segregation in oocytes, linked to reduced condensin II. Overexpressing NCAPG2 rescued these fertility defects.

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Area of Science:

  • Cell Biology
  • Genetics
  • Reproductive Biology

Background:

  • Reproductive isolation arises from genetic incompatibilities preventing interbreeding between populations.
  • Hybrid female sterility is a poorly understood aspect of reproductive isolation at the cellular level.

Purpose of the Study:

  • To investigate the cell biology underlying hybrid female sterility in mice.
  • To identify the molecular mechanisms causing chromosome abnormalities in hybrid oocytes.

Main Methods:

  • Comparative analysis of oocyte chromosome structure and condensin protein levels in two mouse species (Mus musculus domesticus and Mus spretus) and their F1 hybrids.
  • Genetic manipulation (overexpression of NCAPG2) to assess rescue of hybrid phenotypes.
  • Microscopy and cytogenetic analysis to evaluate chromosome condensation and segregation.

Main Results:

  • Species divergence in condensin regulation and centromere organization leads to chromosome decondensation and mis-segregation in hybrid oocytes.
  • Reduced levels of condensin II, particularly at pericentromeric major satellite regions, were observed in hybrid oocytes.
  • Overexpression of the condensin II subunit NCAPG2 rescued chromosome decondensation and reduced egg aneuploidy.

Conclusions:

  • Condensin misregulation and pericentromeric satellite expansion contribute to hybrid incompatibility and female sterility in mammals.
  • This study provides cell biological insights into reproductive isolation barriers during female meiosis.