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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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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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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Updated: May 2, 2026

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Regulating the chromatin landscape: structural and mechanistic perspectives.

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  • 1University of Texas MD Anderson Cancer Center, Department of Molecular Carcinogenesis, Smithville, Texas 78957;

Annual Review of Biochemistry
|March 11, 2014
PubMed
Summary

Chromatin remodelers are vital for cell development and are implicated in diseases. Understanding their structure and function is key to developing new therapies for cancer and neurological disorders.

Keywords:
ATRXCHDINO80ISWISWI/SNFSWR1cancerdifferentiationepigeneticshistonenucleosometranscription

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Chromatin remodelers are essential protein complexes that regulate gene expression and cellular processes.
  • Dysfunctional chromatin remodelers are linked to various human diseases, including cancer and neurological disorders.
  • These complexes play critical roles in cell development and differentiation.

Purpose of the Study:

  • To review the structural organization and functional properties of chromatin remodeling complexes.
  • To elucidate the mechanistic details of how these complexes alter chromatin structure.
  • To highlight the importance of understanding chromatin remodelers for disease-targeted therapies.

Main Methods:

  • Literature review of structural and functional studies on chromatin remodelers.
  • Analysis of protein domain functions within these complexes.
  • Examination of mechanistic insights into nucleosome mobilization and chromatin alteration.

Main Results:

  • Chromatin remodelers exhibit diverse structural organizations and functional properties.
  • Specific protein domains within these complexes are crucial for their activity.
  • Mechanistic studies reveal how remodelers alter nucleosome positioning and higher-order chromatin structure.

Conclusions:

  • A comprehensive understanding of chromatin remodeler structure and function is vital for disease research.
  • Identifying subunits of chromatin remodelers is crucial for developing targeted therapies for human diseases.
  • Further research into these complexes will advance our knowledge of cell biology and disease mechanisms.