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Related Concept Videos

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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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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.
Writers
The writer...
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The Nucleosome Core Particle01:12

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.
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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Nucleosome Remodeling02:54

Nucleosome Remodeling

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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.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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Heterochromatin02:38

Heterochromatin

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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...
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Euchromatin01:01

Euchromatin

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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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Updated: Sep 30, 2025

Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
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Dynamic Opposition of Histone Modifications.

Ana María Garzón-Porras1, Emma Chory2,3,4, Berkley E Gryder1

  • 1Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, Ohio 44106, United States.

ACS Chemical Biology
|March 17, 2022
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Summary

Dynamic opposition of histone modifications, involving writers and erasers like HDACs and KDM5A, is crucial for gene transcription. This balance regulates chromatin for RNA polymerase II engagement.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • Gene transcription requires coordinated histone modifications.
  • Histone 'erasers' play a critical role alongside 'writers' in regulating gene activity.
  • Understanding the interplay between histone modification enzymes is key to understanding gene regulation.

Purpose of the Study:

  • To introduce and explain the concept of dynamic opposition of histone modifications.
  • To highlight the specific roles of HDACs and KDM5A in maintaining epigenetic balance.
  • To propose a model where histone modifications regulate chromatin dynamics and gene expression.

Main Methods:

  • Review and synthesis of existing literature on histone modification enzymes.
  • Conceptual framework development based on experimental observations.
  • Analysis of the roles of histone deacetylases (HDACs) and KDM5A in specific genomic contexts.

Main Results:

  • HDACs are essential for maintaining acetylation balance at superenhancers.
  • KDM5A is required for the recycling of H4K3me3 at active gene promoters.
  • Histone modifications influence charge balance, impacting biomolecular condensate formation and nucleosome turnover.

Conclusions:

  • Dynamic opposition of histone modifications is a fundamental mechanism in gene regulation.
  • Histone modifications act as a short-term memory influencing chromatin accessibility.
  • This epigenetic memory guides checkpoints for RNA polymerase II recruitment and transcription initiation.