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Related Concept Videos

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...
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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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High Resolution Whole Mount In Situ Hybridization within Zebrafish Embryos to Study Gene Expression and Function
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Modulation of Tcf3 repressor complex composition regulates cdx4 expression in zebrafish.

Hyunju Ro1, Igor B Dawid

  • 1Laboratory of Molecular Genetics, Program in Genomics of Differentiation, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.

The EMBO Journal
|June 14, 2011
PubMed
Summary

Transcription factor Tcf3 normally suppresses caudal homeobox (cdx4) gene expression. E4f1 protein disrupts this repression, ensuring proper embryonic development and red blood cell formation.

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Area of Science:

  • Developmental biology
  • Gene regulation
  • Molecular mechanisms

Background:

  • The caudal homeobox (cdx) gene family is essential for embryonic caudal body formation and erythropoiesis.
  • While the Wnt pathway influences zebrafish cdx4 expression, the precise molecular regulation remains unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism by which Tcf3 regulates cdx4 expression.
  • To identify factors that modulate Tcf3's repressive activity on cdx4.

Main Methods:

  • Direct binding assays to identify Tcf3 interaction sites on the cdx4 gene regulatory region.
  • Zebrafish embryo experiments and cultured mammalian cell studies.
  • Investigating the roles of E4f1 and Lnx2b in modulating Tcf3 activity.

Main Results:

  • Tcf3 directly binds to multiple sites in the cdx4 gene regulatory region, suppressing its expression.
  • Corepressors Groucho (Gro)/TLE and HDAC1 are required for Tcf3-mediated repression.
  • Transcription factor E4f1 dissociates corepressors from Tcf3, thereby derepressing cdx4.
  • E3 ubiquitin ligase Lnx2b counteracts E4f1's effects, acting as a scaffold protein.

Conclusions:

  • E4f1 modulates Tcf3 repressor function by dissociating corepressors, ensuring precise cdx4 expression in the embryonic caudal domain.
  • This regulatory interplay involving Tcf3, E4f1, and Lnx2b is critical for robust gene expression control during development.