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Related Concept Videos

Euchromatin01:01

Euchromatin

8.4K
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...
8.4K
Euchromatin01:01

Euchromatin

3.5K
3.5K
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...
16.6K
Heterochromatin02:38

Heterochromatin

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4.2K
Chromatin Packaging01:32

Chromatin Packaging

18.4K
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...
18.4K
Chromatin Packaging02:21

Chromatin Packaging

19.4K
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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Related Experiment Video

Updated: Nov 24, 2025

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Published on: November 11, 2025

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Chromatin: Liquid or Solid?

Alexandra Zidovska1

  • 1Center for Soft Matter Research, Department of Physics, New York University, New York, New York, USA.

Cell
|December 28, 2020
PubMed
Summary
This summary is machine-generated.

Condensed chromatin exhibits solid-like behavior at mesoscales. This study reveals insights into the physical organization of the genome using advanced microscopy techniques in vitro and in living cells.

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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Area of Science:

  • Genomics
  • Cell Biology
  • Biophysics

Background:

  • Chromatin, the complex of DNA and proteins, forms the genome's physical structure.
  • Understanding chromatin's physical properties is crucial for gene regulation and cellular function.

Purpose of the Study:

  • To investigate the mesoscale physical behavior of condensed chromatin.
  • To determine if chromatin condensates behave as solids or liquids in vitro and in vivo.

Main Methods:

  • Fluorescent microscopy
  • Fluorescent recovery after photobleaching (FRAP)
  • Transmission electron microscopy (TEM)

Main Results:

  • Condensed chromatin demonstrates solid-like mechanical behavior at mesoscales.
  • This behavior was observed consistently in both in vitro reconstituted systems and within living cells.

Conclusions:

  • Chromatin condensates possess solid-like properties, influencing genome organization.
  • These findings offer novel perspectives on the physical principles governing the genome's structure and function.