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GADD45a physically and functionally interacts with TET1.

Sabine Kienhöfer1, Michael U Musheev1, Ulrike Stapf1

  • 1Institute of Molecular Biology, 55128 Mainz, Germany.

Differentiation; Research in Biological Diversity
|November 8, 2015
PubMed
Summary
This summary is machine-generated.

Growth Arrest and DNA Damage 45a (GADD45a) protein cooperates with Ten-Eleven-Translocation 1 (TET1) in DNA demethylation. GADD45a enhances TET1 activity and promotes the removal of modified cytosine bases during this process.

Keywords:
DNA demethylationGadd45LC–MS/MSTEThmC

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • DNA demethylation is crucial for development and adult physiology.
  • Active DNA demethylation involves mechanisms like Growth Arrest and DNA Damage 45 (GADD45) and Ten-Eleven-Translocation (TET) proteins.
  • The functional relationship between GADD45 and TET proteins in DNA demethylation is not fully understood.

Purpose of the Study:

  • To investigate the functional relationship between GADD45a and TET1 in DNA demethylation.
  • To elucidate the role of GADD45a in methylcytosine (mC) processing mediated by TET1.

Main Methods:

  • Reporter assays to assess demethylation activity.
  • Co-immunoprecipitation to confirm physical interaction.
  • Global analysis of modified cytosine levels.
  • Gene expression analysis of GADD45a target genes.

Main Results:

  • GADD45a physically interacts with and functionally cooperates with TET1.
  • GADD45a requires endogenous TET1 for demethylation reporter activity, and TET1 requires GADD45a.
  • GADD45a enhances TET1-mediated 5-hydroxymethylcytosine (hmC) production and promotes the removal of 5-formylcytosine (fC) and 5-carboxylcytosine (caC).

Conclusions:

  • GADD45a plays a dual role in oxidative DNA demethylation.
  • GADD45a promotes TET1 activity and enhances the subsequent removal of modified cytosines.
  • This interaction is critical for efficient DNA demethylation processes.