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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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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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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Updated: Dec 30, 2025

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Chromatin state switching in a polymer model with mark-conformation coupling.

Kyosuke Adachi1,2, Kyogo Kawaguchi1,3

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The polymer-Potts model exhibits discrete phase transitions between swollen and compact chromatin states. Small changes in epigenetic factors can cause large shifts in chromatin organization, mimicking cell differentiation.

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Area of Science:

  • Computational physics
  • Biophysics
  • Polymer physics

Background:

  • Chromatin conformation and mark switching are crucial for gene regulation.
  • Understanding the physical basis of chromatin state transitions is essential.

Purpose of the Study:

  • To investigate the phase transition properties of the polymer-Potts model.
  • To model chromatin conformation and mark switching dynamics.

Main Methods:

  • Utilized the mean-field approximation.
  • Analyzed the polymer-Potts model with magnetic degrees of freedom.

Main Results:

  • Identified a discrete, first-order phase transition between swollen-disordered and compact-ordered states.
  • Observed a significantly larger jump in magnetization (mark coherence) during the ordering transition compared to the long-range Potts model.

Conclusions:

  • The polymer-Potts model provides a framework for understanding discrete chromatin state switching.
  • Small variations in epigenetic writer concentrations can induce macroscopic chromatin state changes, potentially explaining phenomena like cell differentiation.