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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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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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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Euchromatin01:01

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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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Spreading of Chromatin Modifications02:25

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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.
Writers
The writer...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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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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Related Experiment Video

Updated: Sep 5, 2025

A Method to Study de novo Formation of Chromatin Domains
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Chromatin dynamics controls epigenetic domain formation.

Marina Katava1, Guang Shi2, D Thirumalai2

  • 1Laboratoire de Biochimie Théorique, CNRS, Université de Paris, Paris, France.

Biophysical Journal
|July 8, 2022
PubMed
Summary
This summary is machine-generated.

Epigenetic marks spread through nucleosomes via a positive-feedback mechanism, forming stable domains. A new 3DSpreader model accurately predicts this spreading behavior in cells.

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Area of Science:

  • Epigenetics
  • Chromatin Biology
  • Computational Biology

Background:

  • Nucleosomes store epigenetic information, influencing gene expression across generations.
  • Nucleosome modifications, enzyme-triggered, can spread via positive feedback.
  • Understanding epigenetic mark spreading is crucial for inheritance and gene regulation.

Purpose of the Study:

  • To model the spreading of epigenetic marks on nucleosomes.
  • To investigate the formation of stable epigenetic domains.
  • To explain the role of nucleation sites in mark propagation.

Main Methods:

  • Developed the 3DSpreader polymer model for nucleosome modification dynamics.
  • Simulated nucleosome states (unmodified/modified) based on neighbor states.
  • Incorporated chromatin dynamics and three-dimensional looping interactions.

Main Results:

  • The 3DSpreader model predicts the formation of finite, bounded epigenetic domains without boundary elements.
  • Domain formation is dependent on the spreading rate relative to chromatin relaxation.
  • A permanent nucleation site is essential for maintaining stable, modified domains.

Conclusions:

  • The 3DSpreader model successfully replicates experimental data on H3K9me3 spreading.
  • Nucleosome modification spreading is a stochastic process influenced by chromatin structure.
  • Nucleation sites play a critical role in establishing and maintaining epigenetic domains.