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Related Concept Videos

Euchromatin01:01

Euchromatin

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...
Euchromatin01:01

Euchromatin

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...
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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 timing and level of...
Heterochromatin02:38

Heterochromatin

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 9th...
Heterochromatin02:38

Heterochromatin

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 9th...
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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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Related Experiment Video

Updated: Jun 2, 2026

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
10:57

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

Published on: November 11, 2025

Chromatin in the nuclear landscape.

D B Beck1, R Bonasio, S Kaneko

  • 1Howard Hughes Medical Institute and Department of Biochemistry, School of Medicine, New York University, New York, New York 10016, USA.

Cold Spring Harbor Symposia on Quantitative Biology
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

This study investigates Polycomb repressive complex 2 (PRC2) and PR-Set7, key regulators of chromatin formation and nuclear organization. We explored their roles in histone modification and spatial chromatin regulation using novel techniques.

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Related Experiment Videos

Last Updated: Jun 2, 2026

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Published on: November 11, 2025

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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3D Multicolor DNA FISH Tool to Study Nuclear Architecture in Human Primary Cells
11:25

3D Multicolor DNA FISH Tool to Study Nuclear Architecture in Human Primary Cells

Published on: January 25, 2020

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • Chromatin structure is crucial for nuclear organization and function.
  • Polycomb repressive complex 2 (PRC2) and PR-Set7 are key epigenetic regulators.
  • PRC2 mediates H3K27 trimethylation for facultative heterochromatin formation.
  • PR-Set7 mediates H4K20 monomethylation, essential for cell cycle and DNA repair.

Purpose of the Study:

  • To elucidate basic mechanisms regulating chromatin formation and maintenance.
  • To investigate the roles of PRC2 and PR-Set7 in chromatin regulation.
  • To develop novel techniques for assessing spatial chromatin organization.

Main Methods:

  • Biochemical assays to study histone methyltransferase activity.
  • Cellular imaging techniques to analyze nuclear organization.
  • Genetic manipulation to assess the function of PRC2 and PR-Set7.

Main Results:

  • Detailed characterization of PRC2 and PR-Set7 enzymatic activities.
  • Demonstrated roles of PRC2 and PR-Set7 in establishing specific chromatin states.
  • Development of new methods for visualizing and quantifying spatial chromatin distribution.

Conclusions:

  • PRC2 and PR-Set7 are critical for establishing and maintaining distinct chromatin structures.
  • Understanding these regulators provides insights into nuclear organization and function.
  • Novel techniques enhance the study of spatial chromatin regulation.