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Transcriptional Control by the SMADs

Caroline S Hill1

  • 1The Francis Crick Institute, Lincoln's Inn Fields Laboratory, London WC2A 3LY, United Kingdom.

Cold Spring Harbor Perspectives in Biology
|July 25, 2016
PubMed

Insights

Transforming growth factor-beta (TGF-β) signaling utilizes SMAD proteins as transcription factors. These SMADs cooperate with other factors to regulate gene expression through chromatin remodeling.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Gene Regulation

Background:

  • Transforming growth factor-beta (TGF-β) ligands regulate cellular processes by altering gene expression.
  • SMAD proteins are key signal transducers in TGF-β pathways, functioning as transcription factors.
  • Understanding SMAD-mediated gene regulation is crucial for comprehending TGF-β signaling.

Purpose of the Study:

  • To review the mechanisms by which SMAD proteins regulate gene transcription.
  • To explore the functional implications of SMAD-mediated transcriptional control.
  • To highlight the cooperation between SMADs and other transcription factors.

Main Methods:

  • Review of existing literature on TGF-β signaling and SMAD proteins.
  • Analysis of molecular mechanisms of SMAD binding and transcriptional regulation.
  • Examination of chromatin remodeling and coactivator/corepressor recruitment.

Main Results:

  • SMAD complexes are activated in the cytoplasm and translocate to the nucleus.
  • SMADs bind to enhancer/promoter regions of target genes to modulate transcription.
  • SMADs exhibit weak DNA binding affinity, necessitating cooperation with other transcription factors.
  • Cooperating transcription factors integrate TGF-β signals with environmental and cellular cues.
  • Activated SMADs recruit coactivators and corepressors to remodel chromatin and modify histones.

Conclusions:

  • SMAD proteins are central mediators of TGF-β-induced gene expression changes.
  • Cooperative interactions with other transcription factors are essential for SMAD function and signal integration.
  • Chromatin remodeling by SMAD complexes plays a critical role in regulating target gene transcription.

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