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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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Effects of Histone H2B Ubiquitylations and H3K79me<sub>3</sub> on Transcription Elongation.

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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
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Histone Modifications, Internucleosome Dynamics, and DNA Stresses: How They Cooperate to "Functionalize" Nucleosomes.

Wladyslaw A Krajewski1

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Frontiers in Genetics
|May 16, 2022
PubMed
Summary

Histone ubiquitylation directly impacts nucleosome dynamics and structure, influencing DNA accessibility. Internucleosomal interactions further modulate these effects, revealing complex epigenetic regulation mechanisms.

Keywords:
DNA stresseshexasomeshistone codehistone modificationshistonesnucleosomesubiquitylation

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Chromatin Structure

Background:

  • Chromatin packaging of DNA restricts accessibility, while active chromatin states exhibit high nucleosome flexibility.
  • Histone posttranslational modifications regulate chromatin activity, with bulky modifications like ubiquitylation being understudied.
  • Understanding nucleosome dynamics is crucial for basic science and treating genetic diseases.

Purpose of the Study:

  • To explore how histone ubiquitylation directly affects nucleosome dynamics and structure.
  • To investigate the role of internucleosomal interactions in modulating nucleosome rearrangements.
  • To propose a cooperative model involving histone modifications, nucleosome dynamics, and internucleosomal interactions in epigenetic programming.

Main Methods:

  • Review of recent evidence on histone ubiquitylation and nucleosome dynamics.
  • Analysis of studies on internucleosomal interactions and nucleosome rearrangements.
  • Discussion of DNA stress-dependent regulation of nucleosome structure.

Main Results:

  • Histone ubiquitylation can directly alter nucleosome dynamics, promoting decomposition or stabilization.
  • Internucleosomal interactions significantly influence nucleosome dynamics and rearrangements.
  • Bulky histone modifications, inherent nucleosome dynamics, and internucleosomal interactions likely cooperate.

Conclusions:

  • Histone ubiquitylation is a key regulator of nucleosome dynamics beyond merely signaling.
  • Internucleosomal interactions play a critical role in modulating nucleosome behavior.
  • A cooperative model integrating multiple factors explains dynamic chromatin states and epigenetic diversity.