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Related Concept Videos

Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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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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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 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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Heterochromatin02:38

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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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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Related Experiment Video

Updated: Aug 29, 2025

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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Regulation associated modules reflect 3D genome modularity associated with chromatin activity.

Lina Zheng1, Wei Wang2,3,4

  • 1Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, 92093-0359, USA.

Nature Communications
|September 8, 2022
PubMed
Summary

Histone modifications reveal novel genome structures called regulation associated modules (RAMs). These RAMs better align with chromatin activity than topologically associating domains (TADs), bridging 3D genome structure and function.

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Area of Science:

  • Genomics
  • Epigenetics
  • Computational Biology

Background:

  • The 3D genome is organized into spatial modules like topologically associating domains (TADs) and compartments, primarily defined by Hi-C contact data.
  • A gap exists in understanding the relationship between spatial chromatin organization and functional modularity driven by chromatin activity.
  • Histone modifications are key indicators of chromatin activity, but their direct use in inferring genome spatial modularity is underexplored.

Purpose of the Study:

  • To investigate if histone modification patterns reflect spatial chromatin modularity.
  • To introduce and characterize a novel genomic modular organization termed regulation associated modules (RAMs).
  • To compare the functional and structural relevance of RAMs with existing genomic structures like TADs.

Main Methods:

  • Analysis of histone modification patterns to identify modular structures.
  • Comparison of the co-occurrence of regulatory elements (enhancer-promoter interactions, loop anchors, super-enhancer clusters) and extrachromosomal DNAs (ecDNAs) within RAMs versus TADs.
  • Assessment of the impact of RAM boundary deletions on chromatin structure and enrichment of somatic variants in cancer samples within RAM boundaries compared to TAD boundaries.

Main Results:

  • Histone modifications exhibit a modular pattern, identified as regulation associated modules (RAMs), which correlates with spatial chromatin organization.
  • Enhancer-promoter interactions, loop anchors, super-enhancer clusters, and ecDNAs are more frequently found within the same RAMs than within the same TADs.
  • Deletions of RAM boundaries cause more severe chromatin structure perturbations than TAD boundary deletions, and somatic variants in cancer are more enriched in RAM boundaries.

Conclusions:

  • RAMs represent a novel layer of genome organization reflected by histone modifications, aligning better with chromatin activity than TADs.
  • RAMs provide a crucial link between the structural and functional modularity of the 3D genome.
  • RAMs offer a new perspective for understanding genome organization and its role in biological processes and diseases like cancer.