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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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Heterochromatin02:38

Heterochromatin

14.0K
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...
14.0K
Euchromatin01:01

Euchromatin

7.0K
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.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.0K
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

5.6K
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...
5.6K
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...
9.2K
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.3K
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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Related Experiment Video

Updated: Jul 23, 2025

Capturing Chromosome Conformation Across Length Scales
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Capturing Chromosome Conformation Across Length Scales

Published on: January 20, 2023

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Predicting scale-dependent chromatin polymer properties from systematic coarse-graining.

Sangram Kadam1, Kiran Kumari2, Vinoth Manivannan2

  • 1Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai, 400076, India. sangramkadam@iitb.ac.in.

Nature Communications
|July 11, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals that coarse-grained chromatin beads are soft and overlapping, not rigid. These findings provide essential parameters for accurate polymer simulations of genome organization.

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Area of Science:

  • Genomics
  • Computational Biology
  • Biophysics

Background:

  • Simulating chromatin is vital for understanding genome organization and dynamics.
  • Existing coarse-grained polymer models lack precise parameters for chromatin representation.

Purpose of the Study:

  • To systematically coarse-grain chromatin using nucleosome-resolution data.
  • To derive essential physical parameters for accurate polymer modeling of chromatin.

Main Methods:

  • Utilized Micro-C data for nucleosome-resolution contact probability analysis.
  • Computed bead size distributions, bond length fluctuations, and effective spring constants.
  • Derived inter-bead potentials and overlap parameters for coarse-grained models.

Main Results:

  • Demonstrated that coarse-grained chromatin beads are soft and can overlap.
  • Quantified bead size distributions, bond length, and angle distributions.
  • Identified distinct structural behaviors at Topologically Associating Domain (TAD) boundaries versus interiors.

Conclusions:

  • Developed a coarse-grained polymer model with quantitatively estimated parameters.
  • Findings challenge the rigid bead assumption and provide a foundation for future chromatin simulations.
  • Results offer insights into chromatin folding, bendability, and structural heterogeneity.