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Related Experiment Video

Updated: Sep 9, 2025

Immunohistochemical Detection of 5-Methylcytosine and 5-Hydroxymethylcytosine in Developing and Postmitotic Mouse Retina
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Preventing CpG hypermethylation in oocytes safeguards mouse development.

Yumiko K Kawamura1, Evgeniy A Ozonov2, Panagiotis Papasaikas2

  • 1Friedrich Miescher Institute for Biomedical Research, 4056 Basel, Switzerland.

Developmental Cell
|September 3, 2025
PubMed
Summary
This summary is machine-generated.

Histone demethylases KDM2A and KDM2B prevent aberrant DNA methylation in oocytes. This epigenetic regulation is crucial for gene transcription and successful early embryonic development.

Keywords:
CpG islandDNA methylationKDM2AKDM2BPRC1Polycombembryogenesismaternal epigenetic inheritanceoocytereprogramming

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genomics

Background:

  • Mammalian genomes are typically DNA-methylated, but oocytes maintain low DNA methylation (DNAme) levels, primarily in transcribed regions.
  • The mechanisms controlling de novo DNAme in oocytes and their impact on embryonic development remain largely unknown.

Purpose of the Study:

  • To investigate the mechanisms that restrict de novo DNAme in oocytes.
  • To determine the role of KDM2A and KDM2B in regulating the oocyte methylome.
  • To assess the consequences of aberrant oocyte DNAme on embryonic development.

Main Methods:

  • Utilized genetic mutations in KDM2A and KDM2B in mice.
  • Analyzed DNA methylation patterns in oocytes and early embryos.
  • Assessed gene transcription and embryonic development in mutant embryos.

Main Results:

  • KDM2A and KDM2B prevent genome-wide histone H3 lysine 36 di-methylation, which normally impedes DNMT3A-catalyzed DNAme.
  • Loss of KDM2A/KDM2B leads to aberrant DNAme at CpG islands in oocytes.
  • This aberrant maternal DNAme represses gene transcription in two-cell embryos and impairs pre-implantation development.
  • Dnmt3a deficiency during oogenesis rescues the developmental defects caused by aberrant maternal DNAme.

Conclusions:

  • KDM2A and KDM2B are essential for maintaining the oocyte methylome and ensuring developmental competence.
  • The reprogramming capacity of early embryos is insufficient to erase aberrant maternal DNAme.
  • Early embryonic development is sensitive to gene dosage effects arising from epigenetic dysregulation.