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Related Concept Videos

Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...
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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 variants are also...
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Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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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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Updated: Jun 23, 2026

Genome-wide Analysis of HDAC Inhibitor-mediated Modulation of microRNAs and mRNAs in B Cells Induced to Undergo Class-switch DNA Recombination and Plasma Cell Differentiation
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Genome-wide Analysis of HDAC Inhibitor-mediated Modulation of microRNAs and mRNAs in B Cells Induced to Undergo Class-switch DNA Recombination and Plasma Cell Differentiation

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Leukemia risk factor ARID5B coordinates HDAC-mediated transcriptional repression.

Ana P Kutschat1,2, Fabian Frommelt2, Brianda L Santini2

  • 1St. Anna Children's Cancer Research Institute (CCRI), 1090 Vienna, Austria.

Nucleic Acids Research
|June 22, 2026
PubMed
Summary

ARID5B variants predispose children to leukemia. This study reveals ARID5B forms a repressor complex, regulating B-cell genes and offering insights into B-ALL development.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Genetic studies link ARID5B variants to childhood B-cell acute lymphoblastic leukemia (B-ALL).
  • The precise molecular function of ARID5B in this context is largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanisms of ARID5B.
  • To understand how ARID5B variants contribute to B-ALL predisposition.

Main Methods:

  • Proteomics, genomics, and transcriptomics were utilized.
  • Chromatin immunoprecipitation followed by sequencing (CUT&RUN) mapped ARID5B binding sites.
  • Protein-protein interaction studies identified complex members.

Main Results:

  • ARID5B forms a chromatin repressor complex with MIER1, C16ORF87, HDAC1, and HDAC2.
  • ARID5B localizes to active genomic regions, recruiting HDAC1/HDAC2 to promoters and regulatory elements.
  • The complex represses genes crucial for B-cell proliferation and signaling.

Conclusions:

  • ARID5B functions as a transcriptional repressor in B-cells.
  • Its mechanism involves forming a complex that regulates B-cell-specific genes.
  • Understanding this mechanism sheds light on ARID5B's role in B-ALL pathogenesis.