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Updated: Aug 10, 2026

Polarized Translocation of Fluorescent Proteins in Xenopus Ectoderm in Response to Wnt Signaling
06:55

Polarized Translocation of Fluorescent Proteins in Xenopus Ectoderm in Response to Wnt Signaling

Published on: May 26, 2011

Docking protein SNT1 is a critical mediator of fibroblast growth factor signaling during Xenopus embryonic

Keiko Akagi1, Eui Kyun Park, Kathleen Mood

  • 1Regulation of Cell Growth Laboratory, National Cancer Institute-Frederick, Frederick, MD 21702, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|February 12, 2002
PubMed

Insights

The docking protein SNT1/FRS2 (fibroblast growth factor receptor substrate 2) is crucial for Xenopus development. It mediates fibroblast growth factor (FGF) signaling, essential for mesoderm formation and embryonic structure development.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Biology

Background:

  • Fibroblast growth factor receptor substrate 2 (SNT1/FRS2) is known to transmit signals from growth factor receptors to the MAP kinase cascade.
  • However, its specific biological roles during embryonic development remain largely uncharacterized.

Purpose of the Study:

  • To investigate the function of the Xenopus homolog of SNT1/FRS2 (XSNT1) in early embryonic development.
  • To elucidate the role of XSNT1 in mediating fibroblast growth factor (FGF) signaling pathways.

Main Methods:

  • Expression pattern analysis of XSNT1 during Xenopus development.
  • Gain-of-function experiments using ectopic XSNT1 expression.
  • Loss-of-function studies utilizing antisense XSNT1 morpholino oligonucleotides (XSNT-AS).
  • Assessment of MAP kinase activity and mesodermal marker expression.

Main Results:

  • XSNT1 expression parallels that of fibroblast growth factor receptor-1 (FGFR1) in Xenopus embryos.
  • Ectopic XSNT1 enhanced FGF receptor-induced defects and boosted MAP kinase activity and mesodermal marker expression.
  • Loss-of-function studies with XSNT-AS resulted in severe malformations, disrupted muscle and notochord formation, and inhibited FGFR-induced MAP kinase activation.
  • XSNT-AS blocked FGFR-mediated mesoderm induction and elongation movements in ectodermal explants.

Conclusions:

  • XSNT1 is a critical mediator of FGF signaling in Xenopus.
  • XSNT1 plays an essential role in mesoderm formation and overall early embryonic development.

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