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TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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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 Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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HEB and E2A function as SMAD/FOXH1 cofactors.

Se-Jin Yoon1, Andrea E Wills, Edward Chuong

  • 1Department of Genetics, Stanford University, Stanford, California 94305, USA.

Genes & Development
|August 11, 2011
PubMed
Summary

E proteins (HEB and E2A) are novel cofactors in Nodal signaling. They bind SMAD transcription factors and FOXH1, which is crucial for mesendoderm differentiation and embryonic development.

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Last Updated: May 30, 2026

An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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Published on: November 29, 2016

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Chromatin Immunoprecipitation Assay for Tissue-specific Genes using Early-stage Mouse Embryos

Published on: April 29, 2011

Area of Science:

  • Stem cell biology
  • Developmental biology
  • Molecular signaling

Background:

  • Nodal signaling, involving SMAD transcription factors, is essential for maintaining pluripotency and directing endoderm commitment in embryonic stem cells.
  • The SMAD complex, along with FOXH1, binds specific DNA motifs in human embryonic stem cells (hESCs) and their differentiated progeny.

Purpose of the Study:

  • To identify novel proteins interacting with the SMAD/FOXH1 complex at critical regulatory regions.
  • To elucidate the role of these novel factors in Nodal signaling pathways and early embryonic development.

Main Methods:

  • Identification of a novel SMAD complex-associated (SCA) motif.
  • Analysis of HEB and E2A binding to the SCA motif using biochemical assays.
  • Co-immunoprecipitation to confirm the association of E proteins with SMAD2/3 and FOXH1.
  • Functional studies in Xenopus tropicalis embryos to assess the role of E2A in Nodal signaling and mesendoderm specification.

Main Results:

  • A novel SCA motif was identified, bound by SMAD2/3/4 and FOXH1.
  • Two basic helix-loop-helix (bHLH) proteins, HEB and E2A, were found to bind the SCA motif at overlapping sites with SMAD2/3 and FOXH1.
  • HEB and E2A physically associate with SMAD2/3 and FOXH1, forming a functional complex.
  • E2A was demonstrated to be critical for mesendoderm specification, gastrulation, and Nodal signal transduction in Xenopus embryos.

Conclusions:

  • E proteins (HEB and E2A) function as novel cofactors in the Nodal signaling pathway.
  • These E proteins associate with the SMAD2/3 and FOXH1 complex.
  • The interaction is biologically significant, as E proteins are necessary for mesendoderm differentiation and early embryonic development.