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Updated: Jul 17, 2026

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
08:10

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Published on: December 14, 2015

Negative regulation of Activin/Nodal signaling by SRF during Xenopus gastrulation

Chang-Hyun Yun1, Sun-Cheol Choi, Eunjoo Park

  • 1Natural Medicines Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-333, Korea.

Development (Cambridge, England)
|January 30, 2007
PubMed

Insights

Xenopus serum response factor (XSRF) inhibits mesoderm induction signals, ensuring proper germ layer formation. This research reveals XSRF

Area of Science:

  • Developmental biology
  • Molecular embryology
  • Signal transduction

Background:

  • Activin/Nodal signaling is critical for germ layer formation and axial patterning.
  • Inhibiting this signaling pathway is vital for ectoderm specification and germ layer positioning.

Purpose of the Study:

  • To investigate the role of Xenopus serum response factor (XSRF) in establishing germ layers during early Xenopus development.
  • To elucidate the molecular mechanisms by which XSRF influences mesoderm induction.

Main Methods:

  • Analysis of XSRF transcript localization in early Xenopus embryos.
  • Experimentation with ectopic XSRF expression and XSRF function inhibition (dominant-negative mutant, morpholino oligonucleotides).
  • Investigation of protein-protein interactions between XSRF, Smad2, and FAST-1.

Main Results:

  • XSRF transcripts are localized to the animal pole ectoderm.
  • Ectopic XSRF expression suppresses mesoderm induction.
  • Inhibition of XSRF function leads to expanded mesendodermal gene expression and enhanced Activin signaling.
  • XSRF interacts with Smad2 and FAST-1, inhibiting Activin-induced Smad2-FAST-1 complex formation.

Conclusions:

  • Xenopus serum response factor (XSRF) acts as a negative regulator of mesoderm induction.
  • XSRF plays a crucial role in confining mesoderm induction to the appropriate embryonic regions.
  • XSRF functions by interfering with the Activin/Nodal signaling pathway through interaction with Smad2 and FAST-1.

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