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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...
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...
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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...
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...
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...

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Related Experiment Video

Updated: May 12, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

Polycomb-mediated 3D chromatin interactions in gene regulation.

Sumin Kim1, Miles K Huseyin1, Anders S Hansen1

  • 1Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Gene Regulation Observatory, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; The Novo Nordisk Foundation Center for Genomic Mechanisms of Disease, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Koch Institute for Integrative Cancer Research, Cambridge, MA 02139, USA.

Current Opinion in Genetics & Development
|February 19, 2026
PubMed
Summary

The Polycomb repressive system uses 3D chromatin interactions to regulate genes. This review explores how these interactions form and contribute to gene repression during development.

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Related Experiment Videos

Last Updated: May 12, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

A Method to Study de novo Formation of Chromatin Domains
07:34

A Method to Study de novo Formation of Chromatin Domains

Published on: August 23, 2019

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
09:32

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

Published on: October 14, 2022

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The Polycomb repressive system is a crucial chromatin-based transcriptional regulator in multicellular organisms.
  • Polycomb-group proteins are known to modify histones and organize 3D chromatin structures.
  • The link between histone modifications and gene repression by Polycomb is established, but the role of 3D interactions is unclear.

Purpose of the Study:

  • To review current understanding of Polycomb-mediated 3D chromatin interaction formation.
  • To discuss potential mechanisms by which these interactions regulate gene expression.
  • To highlight knowledge gaps in Polycomb-dependent gene regulation.

Main Methods:

  • Literature review of studies on Polycomb repressive system.
  • Analysis of research on chromatin structure and gene regulation.
  • Synthesis of findings on histone modifications and 3D genome organization.

Main Results:

  • Polycomb-group proteins organize specific 3D chromatin interactions.
  • These interactions are implicated in stable gene silencing.
  • Mechanisms involve looping and tethering of regulatory elements.

Conclusions:

  • Polycomb-mediated 3D chromatin interactions are critical for developmental gene regulation.
  • Understanding these interactions provides insights into epigenetic control.
  • Further research is needed to fully elucidate the functional contribution of 3D interactions to Polycomb gene repression.