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Related Concept Videos

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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The Nucleosome Core Particle01:12

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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The Nucleosome Core Particle02:10

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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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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Nucleosome context regulates chromatin reader preference.

Matthew R Marunde1, Irina K Popova1, Nathan W Hall1

  • 1EpiCypher Inc., Durham, NC 27709, United States.

Nucleic Acids Research
|November 3, 2025
PubMed
Summary
This summary is machine-generated.

Understanding how proteins bind to chromatin is key for disease research. This study shows that using nucleosomes, not just histone peptides, reveals more accurate protein binding preferences, improving insights into biological mechanisms and disease.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Histone post-translational modifications (PTMs) on chromatin regulate gene expression and cellular functions.
  • Understanding the binding preferences of chromatin readers to PTMs is crucial for explaining biological mechanisms and diseases.
  • Current methods using histone peptides lack the full regulatory context of nucleosomes.

Purpose of the Study:

  • To investigate the binding preferences of chromatin readers to both histone peptides and nucleosomes.
  • To compare the regulatory potential of mono- vs. multivalent reader engagement.
  • To validate in vitro findings with in vivo genomic mapping.

Main Methods:

  • Biochemical assays using defined peptide and nucleosome substrates.
  • Interrogation of diverse mono- and multivalent chromatin readers.
  • Chromatin reader-dependent cleavage followed by transposase-accessible sequencing (CUT&RUN) for in vivo mapping.

Main Results:

  • Nucleosome context significantly refined reader binding preferences compared to peptides.
  • Multivalent reader engagement demonstrated regulatory roles beyond simple additive effects.
  • Specific binding mechanisms were elucidated, including L3MBTL1 abrogation and CBX7 CD-ATL tandem specificity for H3K27me3.
  • In vitro findings were validated by in vivo CUT&RUN data.

Conclusions:

  • Using more representative nucleosome substrates provides deeper insights into biological mechanisms and human diseases.
  • The study highlights the importance of considering the full nucleosome context for accurate chromatin reader binding studies.
  • Findings offer potential therapeutic opportunities by clarifying PTM binding in disease pathogenesis.