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Related Concept Videos

Euchromatin01:01

Euchromatin

8.7K
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...
8.7K
Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

3.7K
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
3.7K
Chromatin Packaging01:32

Chromatin Packaging

18.6K
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...
18.6K
Chromatin Packaging02:21

Chromatin Packaging

20.9K
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...
20.9K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

9.2K
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...
9.2K
Heterochromatin02:38

Heterochromatin

17.7K
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...
17.7K

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Related Experiment Video

Updated: Dec 23, 2025

Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes

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Chromatin Viscoelasticity Measured by Local Dynamic Analysis.

Anat Vivante1, Irena Bronshtein1, Yuval Garini1

  • 1Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan, Israel.

Biophysical Journal
|April 23, 2020
PubMed
Summary

The nucleus

Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • The eukaryotic nucleus is a dynamic environment housing DNA, proteins, and RNA, crucial for cellular functions like transcription and DNA repair.
  • Nuclear forces and internal viscoelastic properties maintain genome order amidst cellular processes and external forces.
  • Understanding chromatin's structural and mechanical properties is vital for cell function, yet remains incompletely understood.

Purpose of the Study:

  • To investigate the elastic properties of chromatin in live cells using dynamic measurements and viscoelastic modeling.
  • To quantify the local harmonic potential and effective force constant of chromatin loci.
  • To determine the role of specific proteins, such as lamin A, in chromatin viscoelasticity.

Main Methods:

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  • Tracking the trajectories of single chromatin loci, centromeres, and telomeres in live cells.
  • Analyzing locus dynamics using the Langevin formalism to model local harmonic potentials.
  • Calculating effective force constants based on assumed chromatin network structures and cross-linking proteins.

Main Results:

  • Chromatin's elastic properties were measured in live cells, revealing complex behavior compared to naked DNA.
  • The Langevin formalism and harmonic potential model were applied to analyze chromatin locus dynamics.
  • Lamin A was identified as a key contributor to chromatin viscoelasticity, with its removal significantly reducing local harmonic forces.

Conclusions:

  • Chromatin's mechanical properties are complex and influenced by its network structure and associated proteins.
  • Lamin A plays a significant role in maintaining chromatin's viscoelasticity and local force resistance.
  • This study provides insights into the mechanical regulation of the genome within the nucleus.