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CDK2 regulates the NRF1/Ehmt1 axis during meiotic prophase I.

Nathan Palmer1,2, S Zakiah A Talib1, Chandrahas Koumar Ratnacaram1

  • 1Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore.

The Journal of Cell Biology
|July 28, 2019
PubMed
Summary

Nuclear Respiratory Factor 1 (NRF1) controls euchromatic histone methyltransferase 1 (EHMT1) expression during meiosis. Cyclin-dependent kinase 2 (CDK2) phosphorylation of NRF1 regulates EHMT1, impacting H3K9 methylation patterns in male germ cells.

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Area of Science:

  • Reproductive biology
  • Epigenetics
  • Molecular cell biology

Background:

  • Meiosis produces genetically distinct haploid gametes through two cell divisions.
  • Epigenetic marks are dynamically regulated during meiotic divisions.
  • Histone methylation patterns are crucial for proper meiotic progression.

Purpose of the Study:

  • To investigate the role of Nuclear Respiratory Factor 1 (NRF1) in regulating euchromatic histone methyltransferase 1 (EHMT1) expression during meiotic prophase I.
  • To determine how cyclin-dependent kinase 2 (CDK2) interacts with NRF1 to modulate gene transcription.
  • To understand the impact of CDK2-mediated regulation on H3K9 methylation during male meiosis.

Main Methods:

  • Analysis of NRF1 and EHMT1 gene expression in male germ cells.
  • In vitro studies of CDK2 binding to NRF1 and its effect on NRF1 DNA binding activity.
  • Induced deletion of the Cdk2 gene in spermatocytes to assess gene expression changes.

Main Results:

  • NRF1 was found to regulate EHMT1 transcription, ensuring proper H3K9 methylation patterns during meiotic prophase I.
  • CDK2 interacts with NRF1, binding to the promoters of genes including Ehmt1.
  • CDK2-mediated phosphorylation of NRF1 negatively regulates its DNA binding activity, and Cdk2 deletion increases NRF1 target gene expression.

Conclusions:

  • CDK2-mediated phosphorylation of NRF1 is a key regulatory mechanism controlling EHMT1 expression.
  • This regulation allows for the dynamic modulation of H3K9 methylation during meiotic prophase.
  • The NRF1-EHMT1-H3K9 methylation axis is critical for normal male meiotic progression.