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Related Concept Videos

Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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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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Histone Modification02:32

Histone Modification

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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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Histone Modification02:32

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The Nucleosome Core Particle01:12

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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.
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...
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The Nucleosome Core Particle02:10

The Nucleosome Core Particle

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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.
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...
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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Related Experiment Video

Updated: Mar 22, 2026

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
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Histone Variants and Composition in the Developing Brain: Should MeCP2 Care?

Valentina Zago, Cristina Pinar-CabezaDeVaca, John B Vincent

  • 1Department of Biochemistry and Microbiology, Petch Building 260, University of Victoria, Victoria, BC, V8W 3P6, Canada.

Current Topics in Medicinal Chemistry
|April 19, 2016
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Summary

Brain chromatin features unique histone variants crucial for neuroplasticity and cognition. Understanding their interaction with MeCP2 is vital for brain health and treating neurological disorders.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Brain chromatin composition differs from other tissues, impacting neural development and plasticity.
  • Key proteins like histones and MeCP2 (methyl CpG binding protein 2) undergo significant turnover in neurons.
  • Dysregulation of histones and MeCP2 is linked to various brain disorders.

Purpose of the Study:

  • To highlight the functional roles of histone variants in brain chromatin.
  • To explore the interplay between histone variants and MeCP2 in neuronal function.
  • To emphasize the need for further research into these chromatin proteins' communication.

Main Methods:

  • Literature review focusing on histone variants and MeCP2 in neuronal plasticity.
  • Analysis of existing research on chromatin structure and function in the brain.
  • Synthesis of information regarding protein interactions and their implications.

Main Results:

  • Histone variants play a recently recognized role in neuron plasticity and cognition.
  • Histone variants and MeCP2 share overlapping structural and functional roles in the brain.
  • Limited information currently exists on the specific functional roles of these histone variants.

Conclusions:

  • Histone variants are critical, yet understudied, components of brain chromatin.
  • Understanding the communication between histone variants and MeCP2 is essential for advancing neuroscience.
  • Future research is imperative to elucidate the complex roles of these proteins in brain function and disorders.