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Epigenetic Regulation01:46

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Updated: Jun 15, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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CDCA7 is an evolutionarily conserved hemimethylated DNA sensor in eukaryotes.

Isabel E Wassing1, Atsuya Nishiyama2, Reia Shikimachi3

  • 1Laboratory of Chromosome and Cell Biology, The Rockefeller University, New York, NY 10065, USA.

Science Advances
|August 23, 2024
PubMed
Summary
This summary is machine-generated.

The CDCA7-HELLS complex uniquely senses hemimethylated DNA, crucial for maintaining DNA methylation patterns. This discovery explains its role in preventing DNA hypomethylation and related genetic disorders.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • Mutations in HELLS and CDCA7 cause a syndrome with DNA hypomethylation.
  • The precise mechanism by which CDCA7-HELLS maintains DNA methylation is unknown.
  • This complex is the only known nucleosome remodeler whose deficiency disrupts DNA methylation maintenance.

Purpose of the Study:

  • To elucidate the mechanism by which the CDCA7-HELLS complex maintains DNA methylation.
  • To identify the unique functional domain of CDCA7 involved in DNA methylation maintenance.
  • To understand how CDCA7-HELLS interacts with other key proteins in the DNA methylation pathway.

Main Methods:

  • Protein domain identification and characterization.
  • Cryo-electron microscopy for structural analysis of CDCA7-nucleosome complexes.
  • Biochemical assays to study protein-DNA interactions and chromatin modification.

Main Results:

  • Identified a unique zinc-finger domain in CDCA7 (HMZF) that senses hemimethylated CpG sites.
  • Structural analysis revealed HMZF's ability to recognize hemimethylated DNA within nucleosomes, a feat UHRF1 cannot achieve.
  • Demonstrated that CDCA7 recruits HELLS to hemimethylated chromatin, promoting UHRF1-mediated H3 ubiquitylation and DNA methylation.

Conclusions:

  • The CDCA7-HELLS complex acts as a critical regulator of DNA methylation maintenance.
  • The HMZF domain of CDCA7 enables recognition of inaccessible hemimethylated CpG sites, ensuring epigenetic stability.
  • This mechanism is vital for preventing DNA hypomethylation and associated genetic disorders.