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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 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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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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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 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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Related Experiment Video

Updated: Jul 20, 2025

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Transcription modulates chromatin dynamics and locus configuration sampling.

Giada Forte1, Adam Buckle2, Shelagh Boyle2

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.

Nature Structural & Molecular Biology
|August 3, 2023
PubMed
Summary

The 3D structure of gene loci in living cells is dynamic. Chromatin fiber mobility, particularly for small regions, depends on gene activity and structural changes, influencing gene regulation.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biophysics

Background:

  • The dynamic 3D genome structure is crucial for gene regulation but is poorly understood due to limitations of static experimental methods.
  • Existing techniques like 3C and FISH provide only snapshots of fixed cells, failing to capture live-cell chromatin dynamics.

Purpose of the Study:

  • To investigate the dynamics of chromatin fiber mobility at the Pax6 locus in different transcriptional states using computational modeling.
  • To understand how transcriptional activity and local chromatin structure influence gene locus configuration and dynamics in living cells.

Main Methods:

  • Application of the highly predictive heteromorphic polymer (HiP-HoP) model to simulate chromatin fiber mobility.
  • Analysis of the Pax6 locus in three mouse cell lines with varying transcription states.
  • Integration of simulation data with experimental validation.

Main Results:

  • Transcriptional activity has minimal impact on the movement of large (40-kbp) chromatin regions.
  • The dynamics of smaller (1-kbp) regions are significantly influenced by local chromatin disruption, specifically H3K27 acetylation.
  • Chromatin dynamics enable rapid sampling of conformations, leading to significant variability within single cells.

Conclusions:

  • Local chromatin structure and epigenetic modifications, like H3K27 acetylation, play a key role in regulating gene locus dynamics.
  • Protein-mediated loops and locus configuration are modulated by chromatin dynamics, impacting gene regulation.
  • The study provides a dynamic view of the genome, bridging simulation and experimental data to explain gene activity regulation.