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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,...
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
The Nucleosome Core Particle02:10

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
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...

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Related Experiment Video

Updated: Jun 27, 2026

Expression Analysis of Mammalian Linker-histone Subtypes
14:40

Expression Analysis of Mammalian Linker-histone Subtypes

Published on: March 19, 2012

Histone H1 and its isoforms: contribution to chromatin structure and function.

Nicole Happel1, Detlef Doenecke

  • 1Institute of Biochemistry and Molecular Cell Biology, University of Göttingen, Humboldtallee 23, D-37073 Göttingen, Germany.

Gene
|December 9, 2008
PubMed
Summary

Mammalian H1 histones, crucial for chromatin structure, show functional redundancy. However, inactivating multiple subtypes reveals specific roles in gene regulation and development.

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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue

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Last Updated: Jun 27, 2026

Expression Analysis of Mammalian Linker-histone Subtypes
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Expression Analysis of Mammalian Linker-histone Subtypes

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In Vitro Characterization of Histone Chaperones using Analytical, Pull-Down and Chaperoning Assays
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In Vitro Characterization of Histone Chaperones using Analytical, Pull-Down and Chaperoning Assays

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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
09:43

Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue

Published on: November 30, 2018

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genetics

Background:

  • The H1 histone family, the most divergent in mammals, comprises eleven subtypes.
  • H1 histones regulate higher-order chromatin structure and accessibility to regulatory factors.
  • Phosphorylation is a key posttranslational modification of H1 histones, impacting gene expression and DNA replication.

Purpose of the Study:

  • To investigate the functional redundancy and subtype-specific roles of mammalian H1 histones.
  • To understand the impact of H1 histone gene disruption on chromatin structure and gene regulation.

Main Methods:

  • Gene disruption studies in model organisms to assess H1 subtype functions.
  • Analysis of chromatin condensation and accessibility following H1 histone manipulation.

Main Results:

  • Disruption of one or two H1 subtype genes showed quantitative compensation by other subtypes, indicating functional redundancy.
  • Inactivation of three H1 subtypes or halving the total H1 content led to observable phenotypic effects.
  • Evidence suggests specific H1 subtypes play roles in distinct gene regulation systems during development.

Conclusions:

  • While H1 subtypes exhibit functional redundancy, specific subtypes are essential for particular developmental processes and gene regulatory networks.
  • Understanding H1 histone diversity is critical for comprehending chromatin organization and its role in gene expression.