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Histone Variants at the Centromere

Histone Variants at the Centromere

Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...

Position-effect Variegation

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

Histone Modification

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 Modification

Histone Modification

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Acetylation
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Related Experiment Video

Updated: Jun 20, 2026

Detection of Histone Modifications in Plant Leaves

Detection of Histone Modifications in Plant Leaves

Published on: September 23, 2011

Histone3 variants in plants.

Mathieu Ingouff¹, Frédéric Berger

¹Department of Biological Sciences, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604, Singapore. mathieu.ingouff@cirad.fr

|August 25, 2009

Summary

This summary is machine-generated.

Histone variants are crucial for genome regulation. Emerging plant data suggest conserved and unique roles for histone3 (H3) variants in transcriptional control, expanding on animal model findings.

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Published on: March 4, 2021

Area of Science:

Molecular Biology
Genetics
Plant Science

Background:

Covalent histone modifications regulate chromatin activity.
Histones, key components of nucleosomes, are encoded by gene families and are highly conserved.
Histone variants, particularly histone3 (H3) variants, are increasingly recognized for their roles in genome regulation.

Purpose of the Study:

To review existing data on the roles of histone3 (H3) variants in plant transcriptional control.
To explore functional conservation of H3 variants between plants and animal models.
To speculate on the unique biological significance of H3 variants in plants.

Main Methods:

Literature review of studies on histone variants in plants and animal models.
Analysis of emerging data on H3 variants in plant gene expression.
Comparative analysis of functional conservation and plant-specific roles.

Main Results:

While animal models provide a foundation, plant studies reveal functional conservation of H3 variants in transcriptional control.
Emerging data indicate that H3 variants likely possess plant-specific roles in genome regulation.
The biological significance of H3 variants in plants is an active area of research.

Conclusions:

Histone3 (H3) variants play significant roles in plant genome regulation.
Functional conservation exists between plant and animal H3 variants, but plant-specific functions are also probable.
Further research is needed to fully elucidate the biological significance of H3 variants in plants.