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Related Concept Videos

Nucleosome Remodeling02:54

Nucleosome Remodeling

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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.
Nucleosome remodeling complex
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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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Chromatin Packaging01:32

Chromatin Packaging

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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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Heterochromatin02:38

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 that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Euchromatin01:01

Euchromatin

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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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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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Updated: Jun 4, 2025

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Rethinking chromatin accessibility: from compaction to dynamic interactions.

Tom Fillot1, Davide Mazza2

  • 1Università Vita-Salute San Raffaele, Via Olgettina 58, 20132 Milan, Italy.

Current Opinion in Genetics & Development
|December 20, 2024
PubMed
Summary
This summary is machine-generated.

Chromatin accessibility, not just condensation, determines gene expression. Transcription factor binding depends on chromatin mobility and interactions, challenging traditional genome models.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • Traditional genome models divide DNA into heterochromatin and euchromatin.
  • Chromatin condensation was thought to solely control gene accessibility and expression.

Purpose of the Study:

  • To challenge the binary classification of chromatin structure.
  • To explore novel determinants of transcription factor accessibility beyond condensation.

Main Methods:

  • Investigating chromatin fiber mobility.
  • Analyzing transcription factor multivalent interactions.
  • Examining four-dimensional genome organization.

Main Results:

  • Chromatin accessibility is a factor-specific property.
  • Multiple determinants influence accessibility, including mobility and TF interactions.
  • Traditional binary classification is insufficient.

Conclusions:

  • Chromatin accessibility is complex and multifactorial.
  • New models are needed to understand gene regulation.
  • Innovative experimental methods are crucial for future research.