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Related Concept Videos

Master Transcription Regulators02:23

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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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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Updated: Mar 15, 2026

Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
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The Mediator Complex: From Transcriptional Regulation to Disease Pathogenesis.

Sailakshmi Iyer1, Takashi Ito1, Takeya Nakagawa1

  • 1Department of Biochemistry, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8523, Japan.

International Journal of Molecular Sciences
|March 14, 2026
PubMed
Summary

The Mediator complex, a key transcription regulator, has distinct subunits crucial for human health and disease. This review details subunit functions and their roles in conditions like cancer and developmental disorders.

Keywords:
MED19PPIcancerchromatinmediator complex

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Mediator complex is essential for eukaryotic transcription, bridging transcription factors and RNA polymerase II.
  • While its general role is known, individual subunits have unique functions in physiology and disease.

Purpose of the Study:

  • To provide a subunit-resolved synthesis of Mediator biology, focusing on disease pathogenesis.
  • To highlight the distinct and non-redundant contributions of individual Mediator subunits.

Main Methods:

  • Comprehensive review of genetic, genomic, and clinical evidence.
  • Integration of structural, mechanistic, and pathological findings.
  • Creation of a table detailing disease associations and molecular functions of human Mediator subunits.

Main Results:

  • Individual Mediator subunits exhibit functional specialization.
  • Disruption of specific subunits is linked to cancer, developmental disorders, and metabolic diseases.
  • Mediator complex interacts with chromatin regulators like cohesin to control genome organization.

Conclusions:

  • Understanding subunit-specific functions is critical for comprehending Mediator's role in disease.
  • Targeting specific Mediator subunits offers potential therapeutic avenues for various human diseases.