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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...
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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.
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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.
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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.
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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Histone variants: The bricks that fit differently.

Youssef A Hegazy1, Hejer Dhahri2, Nour El Osmani1

  • 1Department of Epigenetics, Van Andel Research Institute, Grand Rapids, Michigan, USA.

The Journal of Biological Chemistry
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

Histone variants, though subtly different from canonical histones, significantly impact DNA accessibility and gene expression. Aberrant expression of these histone variants is linked to various human diseases.

Keywords:
chromatin accessibilitychromatin dynamicscore histonesgene regulationhistone variantsnucleosome structure

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Histone proteins organize DNA into chromatin.
  • Histone variants are distinct from canonical histones and affect chromatin structure.
  • These variants play roles in DNA replication, repair, and cell development.

Purpose of the Study:

  • To review how core histone variants influence nucleosome structure and DNA accessibility.
  • To examine the role of variant-specific post-translational modifications and their associated proteins.
  • To discuss the link between histone variants and human diseases.

Main Methods:

  • Literature review of histone variant research.
  • Analysis of studies on chromatin structure and gene regulation.
  • Examination of disease-associated histone variant mutations.

Main Results:

  • Histone variants, even with minor amino acid differences, profoundly alter chromatin.
  • Variant-specific modifications and protein interactions create unique regulatory landscapes.
  • Aberrant histone variant expression and mutations are implicated in cancer and developmental disorders.

Conclusions:

  • Histone variants are critical regulators of chromatin function and gene expression.
  • Understanding histone variants is crucial for deciphering disease mechanisms.
  • Further research into histone variants may reveal novel therapeutic targets.