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Relationship between PIWIL4-Mediated H3K4me2 Demethylation and piRNA-Dependent DNA Methylation

Ippei Nagamori1, Hisato Kobayashi2, Toru Nishimura3

  • 1Department of Pathology, Medical School, Osaka University, Suita 565-0871, Osaka, Japan.

Cell Reports
|October 11, 2018
PubMed

Insights

PIWIL4/MIWI2 is crucial for silencing retrotransposons via DNA methylation in male germ cells. It regulates histone modifications, enabling piRNA-dependent DNA methylation and preventing insertional mutagenesis.

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Reproductive Biology

Background:

  • Retrotransposon gene silencing is vital to prevent insertional mutagenesis.
  • DNA methylation patterns are dynamically regulated during male germ cell development.
  • Both piRNA-dependent and piRNA-independent mechanisms mediate retrotransposon DNA methylation re-establishment.

Purpose of the Study:

  • To investigate the role of PIWIL4/MIWI2 in histone modification.
  • To elucidate the involvement of PIWIL4/MIWI2 in piRNA-dependent DNA methylation.
  • To understand the interplay between histone marks and DNA methylation during retrotransposon silencing.

Main Methods:

  • Analysis of histone H3 modifications.
  • Investigation of PIWIL4/MIWI2 binding to histone demethylases.
  • Correlation analysis between H3K4 dimethylation and de novo DNA methylation.
  • Study of piRNA-dependent and independent DNA methylation pathways.

Main Results:

  • H3K4 dimethylation (H3K4me2) is enriched at piRNA-dependent methylated regions.
  • H3K4me2 is anti-correlated with de novo DNA methylation during piRNA-independent phases.
  • PIWIL4 interacts with KDM1A and KDM5B histone demethylases.
  • PIWIL4 is essential for the removal of H3K4me2 marks.

Conclusions:

  • PIWIL4 plays a significant role in regulating histone modifications, specifically H3K4me2.
  • PIWIL4 is critical for the establishment of piRNA-dependent DNA methylation.
  • These findings highlight PIWIL4's function in epigenetic control of retrotransposons during male germ cell development.
Keywords:
DNA methylationgerm cellgonocytepiRNAspermatogenesis

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