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Related Concept Videos

Chromatin Packaging02:21

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, 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? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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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.
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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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
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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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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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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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.
Writers
The writer...
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Updated: Jul 28, 2025

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

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Network models of chromatin structure.

Vera Pancaldi1

  • 1CRCT, Université de Toulouse, Inserm, CNRS, Université Toulouse III-Paul Sabatier, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France.

Current Opinion in Genetics & Development
|May 28, 2023
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Summary
This summary is machine-generated.

Network theory offers powerful tools for analyzing 3D epigenome organization. This approach visualizes chromatin structures and reveals patterns related to cellular phenotypes.

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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
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Last Updated: Jul 28, 2025

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Area of Science:

  • Genomics and computational biology
  • Network science applications in epigenetics

Background:

  • Growing availability of 3D chromatin organization datasets.
  • Need for advanced visualization and analysis tools for nuclear structures.

Purpose of the Study:

  • Review applications of network theory to chromatin contact maps.
  • Highlight potential for uncovering epigenomic patterns and cellular phenotypes.

Main Methods:

  • Utilizing network theory to represent genomic regions as nodes.
  • Applying network metrics to describe 3D epigenome organization and dynamics.
  • Integrating 1D epigenomics data within 3D chromatin structure maps.

Main Results:

  • Demonstrated utility of network theory in analyzing chromatin contact maps.
  • Network approaches facilitate visualization of complex epigenomic data.
  • Identification of epigenomic patterns linked to cellular phenotypes.

Conclusions:

  • Network theory is a valuable framework for studying 3D epigenome organization.
  • This methodology enhances understanding of chromatin structure and dynamics.
  • Network analysis provides insights into genotype-phenotype relationships through epigenomics.