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Author Spotlight: Understanding DNA Damage Response in Mammalian Oocytes and Preimplantation Embryos
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Impeding DNA Break Repair Enables Oocyte Quality Control.

Huanyu Qiao1, H B D Prasada Rao1, Yan Yun1

  • 1Howard Hughes Medical Institute, University of California, Davis, Davis, CA, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, CA, USA.

Molecular Cell
|October 2, 2018
PubMed
Summary

RNF212 is crucial for oocyte quality control, eliminating eggs with meiotic defects. It sensitizes oocytes to DNA damage-induced apoptosis, ensuring proper genome transmission.

Keywords:
HORMADRNF212SUMOapoptosisattritiondouble strand breakfolliclehomologous recombinationmeiosisoocyte

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Area of Science:

  • Reproductive Biology
  • Cellular Biology
  • Genetics

Background:

  • Oocyte quality control mechanisms are essential for eliminating eggs with meiotic errors.
  • Defects in chromosome synapsis and recombination, involving DNA double-strand break (DSB) repair, can trigger oocyte death.

Purpose of the Study:

  • To investigate the role of RNF212, a SUMO ligase, in oocyte quality control.
  • To understand how RNF212 mediates the elimination of defective oocytes during meiosis.

Main Methods:

  • Analysis of RNF212's function in physiological apoptosis and meiotic mutant oocytes.
  • Assessment of DNA damage during oocyte transition into quiescence.
  • Investigating the association of HORMAD1 with desynapsing chromosomes in the presence and absence of RNF212.

Main Results:

  • RNF212 is required for both physiological apoptosis and elimination of oocytes in meiotic mutants.
  • RNF212 sensitizes oocytes to DSB-induced apoptosis during a critical meiotic window.
  • RNF212 impedes DNA double-strand break repair and facilitates HORMAD1 association with desynapsing chromosomes.

Conclusions:

  • Oocytes impede residual DSB repair to retain a 'memory' of meiotic defects for quality control.
  • RNF212 plays a central role in oocyte quality control by regulating DSB repair and apoptosis.
  • RNF212 variants may impact the transmission of defective genomes.