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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

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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
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Spreading of Chromatin Modifications02:25

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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
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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.
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Assays for Validating Histone Acetyltransferase Inhibitors
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Histone deacetylase in human sarcomas.

Ping Quan1, Christoph Schatz2, Johannes Haybaeck3,4

  • 1Independent Researcher.

The International Journal of Biological Markers
|November 7, 2025
PubMed
Summary

Altered histone deacetylases (HDACs) are common in sarcomas, with specific HDACs linked to poor prognosis and therapeutic targets. Understanding diverse HDAC roles guides personalized sarcoma treatment strategies.

Keywords:
Histone deacetylase HDACbone sarcomasoft tissue sarcomauterine sarcoma

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Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Altered histone deacetylases (HDACs) are increasingly implicated in sarcomagenesis.
  • HDACs play diverse, cell-type-specific roles in various human sarcomas.
  • Overexpression of HDACs is a common feature in many sarcoma types, particularly uterine sarcomas.

Purpose of the Study:

  • To review the expression and roles of HDACs in human sarcomas.
  • To provide a foundation for personalized therapy strategies targeting HDACs in sarcomas.
  • To elucidate the dual roles of certain HDACs in sarcoma development and progression.

Main Methods:

  • Literature review of HDAC expression and function in sarcomas.
  • Analysis of HDAC roles in specific sarcoma subtypes (e.g., uterine sarcomas, osteosarcoma, chondrosarcoma).
  • Examination of HDAC involvement in cellular processes like differentiation, drug resistance, and oncogenesis.

Main Results:

  • Class I HDACs (HDAC1-3), particularly HDAC1-2, are frequently upregulated and associated with poor prognosis.
  • Class II HDACs have varied roles, with some (e.g., HDAC4, HDAC5, HDAC6) acting as negative predictors in specific sarcomas.
  • HDACs exhibit dual roles depending on cell context and localization; for instance, HDAC4 can be a tumor suppressor or oncogene.

Conclusions:

  • The diverse expression patterns and context-dependent roles of HDACs in sarcoma pathogenesis are critical.
  • Targeting specific HDACs offers potential for personalized therapeutic interventions in sarcoma treatment.
  • Further understanding of HDACs will guide the development of novel HDAC modulators for sarcoma therapy.