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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...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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 is an enzyme that can...
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...
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...

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Related Experiment Video

Updated: Jun 2, 2026

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

Damage site chromatin: open or closed?

Alexander R Ball1, Kyoko Yokomori

  • 1Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA.

Current Opinion in Cell Biology
|April 15, 2011
PubMed
Summary
This summary is machine-generated.

New research reveals that heterochromatin factors and poly(ADP-ribose) polymerases (PARPs) play crucial roles in recognizing and repairing DNA damage. Chromatin structure dynamically changes during repair, transitioning from closed to open states.

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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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Capturing Common Fragile Site Breaks by Native γH2A.X ChIP

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Last Updated: Jun 2, 2026

A Method to Study de novo Formation of Chromatin Domains
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Published on: August 23, 2019

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10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

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09:46

Capturing Common Fragile Site Breaks by Native γH2A.X ChIP

Published on: January 24, 2025

Area of Science:

  • Molecular Biology
  • Genetics
  • Cellular Biology

Background:

  • Recent technical advancements, including laser microirradiation and chromatin immunoprecipitation, have improved in vivo studies of DNA damage responses.
  • These tools enable better evaluation of factors involved at DNA damage sites.

Purpose of the Study:

  • To investigate the roles of heterochromatin factors in DNA damage recognition and repair.
  • To understand the involvement of poly(ADP-ribose) polymerases (PARPs) in these processes.
  • To explore the dynamic structural changes of chromatin during DNA repair.

Main Methods:

  • Laser microirradiation for inducing localized DNA damage.
  • Chromatin immunoprecipitation (ChIP) to study protein-DNA interactions.
  • In vivo analysis of DNA damage response factors.

Main Results:

  • Heterochromatin factors were identified to have unexpected roles in DNA damage recognition and repair.
  • Poly(ADP-ribose) polymerases (PARPs) are involved in the DNA damage response pathway.
  • Chromatin structure exhibits dynamic changes, with transient closed states preceding open configurations at damage sites.

Conclusions:

  • Heterochromatin factors and PARPs are key players in the cellular response to DNA damage.
  • The dynamic structural plasticity of chromatin is essential for efficient DNA repair, facilitating access for repair machinery.