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Updated: Aug 7, 2026

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

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

Published on: December 14, 2015

Regulation of Laloo by the Xenopus C-terminal Src kinase (Xcsk) during early vertebrate development

Y Song1, A N Cohler, D C Weinstein

  • 1Department of Pharmacology, Mount Sinai School of Medicine, New York, NY, USA.

Oncogene
|August 30, 2001
PubMed

Insights

The C-terminal Src Kinase (Csk) in Xenopus frogs regulates mesoderm formation by inhibiting Src kinases like Laloo. This study characterizes Xenopus Csk (Xcsk), revealing its crucial role in early vertebrate development.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Signaling

Background:

  • Mesoderm formation in Xenopus laevis is crucial for development and relies on Src family kinases.
  • The precise molecular mechanisms governing this dependency are not fully elucidated.
  • C-terminal Src Kinase (Csk) is a known inhibitor of Src activity and essential for mammalian development.

Purpose of the Study:

  • To characterize Xenopus Csk (Xcsk) and its role in mesoderm induction.
  • To investigate the interaction between Xcsk and the Src kinase Laloo.
  • To understand the regulatory circuit involving Src kinases and Csk during early vertebrate development.

Main Methods:

  • Characterization of Xenopus Csk (Xcsk) expression patterns during early development.
  • Co-immunoprecipitation assays to assess physical interactions between Xcsk and Laloo.
  • Functional assays to evaluate the inhibitory activity of Xcsk on mesoderm generation.
  • Analysis of a kinase-inactive Xcsk mutant in synergy with Laloo.

Main Results:

  • Xcsk is broadly expressed during Xenopus early development.
  • Xcsk physically interacts with the Src kinase Laloo.
  • Xcsk inhibits mesoderm generation mediated by Src kinases.
  • A kinase-inactive Xcsk mutant synergizes with Laloo, highlighting the importance of the Src kinase-Csk circuit.

Conclusions:

  • The Src kinase-Csk regulatory circuit plays a fundamental role in mesoderm induction in vivo.
  • Xcsk's inhibitory activity, dependent on its kinase domain, is critical for regulating mesoderm formation.
  • This study elucidates a key molecular interaction governing early vertebrate development.

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