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Related Concept Videos

Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
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...
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...

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Related Experiment Video

Updated: Jun 19, 2026

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
24:02

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin

Published on: April 11, 2014

Histones: annotating chromatin.

Eric I Campos1, Danny Reinberg

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

Annual Review of Genetics
|November 6, 2009
PubMed
Summary
This summary is machine-generated.

Histone posttranslational modifications regulate chromatin structure and accessibility, impacting crucial cellular processes like transcription and DNA packaging. Further research is needed to fully understand their complex effects on gene expression and cellular functions.

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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis
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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Chromatin, a complex of DNA and proteins, organizes genetic material in eukaryotes.
  • Nucleosomes, composed of histone octamers and DNA, are the fundamental units of chromatin structure.
  • Histones undergo posttranslational modifications that influence chromatin properties and gene regulation.

Purpose of the Study:

  • To review advancements in histone posttranslational modifications.
  • To discuss their impact on transcription and DNA packaging.
  • To highlight outstanding questions in the field.

Main Methods:

  • Literature review of past breakthroughs and novel developments.
  • Analysis of histone modifications and their functional consequences.
  • Discussion of chromatin structure and gene regulation.

Main Results:

  • Histone modifications alter chromatin compaction and accessibility.
  • These modifications affect binding of chromatin-modifying complexes.
  • Specific histone marks correlate with distinct biological outcomes, though their precise roles are still being elucidated.

Conclusions:

  • Histone posttranslational modifications are critical regulators of cellular processes.
  • Understanding these modifications is key to deciphering gene expression and chromatin dynamics.
  • Continued research is essential to fully appreciate their multifaceted roles.