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Related Concept Videos

Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Master Transcription Regulators02:23

Master Transcription Regulators

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...
Master Transcription Regulators02:23

Master Transcription Regulators

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...
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

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...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

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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Related Experiment Video

Updated: Jul 7, 2026

A Method to Study de novo Formation of Chromatin Domains
07:34

A Method to Study de novo Formation of Chromatin Domains

Published on: August 23, 2019

Polycomb group proteins and long-range gene regulation.

Julio Mateos-Langerak1, Giacomo Cavalli

  • 1Chromatin and Cell Biology Lab, Institute of Human Genetics, CNRS, 141, rue de la Cardonille, 34396 Montpellier, France.

Advances in Genetics
|February 20, 2008
PubMed
Summary

Polycomb group (PcG) proteins regulate gene expression by influencing DNA, chromatin, and nuclear 3D organization. These proteins may orchestrate gene expression by forming 3D chromatin contact networks.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Genome regulation occurs at DNA, chromatin, and nuclear 3D organization levels.
  • Polycomb group (PcG) proteins are key transcriptional silencers involved in maintaining cellular identity.
  • Emerging evidence suggests PcG proteins play a role in nuclear 3D structure regulation.

Purpose of the Study:

  • To review the current understanding of PcG protein-mediated transcriptional regulation across multiple genomic levels.
  • To explore the potential role of PcG proteins in the 3D organization of the nucleus and regulation of remote genes.

Main Methods:

  • Literature review and synthesis of existing research on Polycomb group proteins.
  • Discussion of PcG protein targeting, chromatin modification, and nuclear organization mechanisms.

Main Results:

  • PcG proteins act at DNA, chromatin, and 3D nuclear organization levels to regulate transcription.
  • PcG proteins are implicated in maintaining cellular identity through epigenetic mechanisms.
  • PcG proteins may establish 3D chromatin networks to control gene expression, potentially affecting remote genes.

Conclusions:

  • PcG proteins are crucial regulators of gene expression across hierarchical genomic levels.
  • PcG proteins likely play a significant role in shaping the 3D nuclear architecture.
  • The formation of 3D chromatin networks by PcG proteins is a proposed mechanism for orchestrating gene expression.