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Development: morphogen gradients and mesodermal patterning

L Dale1

  • 1Department of Anatomy and Developmental Biology, University College London, UK.

Current Biology : CB
|February 28, 1998
PubMed
Summary
This summary is machine-generated.

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Activin signaling establishes a morphogen gradient in Xenopus development, directly causing long-range induction of the brachyury gene. This demonstrates activin

Area of Science:

  • Developmental biology
  • Cell signaling
  • Molecular biology

Background:

  • Activin is known to have long-range effects in Xenopus development.
  • The mesodermally expressed brachyury gene is induced by activin.
  • Previous understanding of activin's mechanism was limited.

Purpose of the Study:

  • To investigate the mechanism behind activin's long-range effects in Xenopus.
  • To determine if activin diffuses through tissues to form a gradient.
  • To confirm that activin signaling is directly responsible for these long-range effects.

Main Methods:

  • Localized activin source in Xenopus embryos.
  • Analysis of brachyury gene expression.
  • Diffusion studies within embryonic tissues.

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Main Results:

  • Activin diffuses through Xenopus tissues, establishing a concentration gradient.
  • The brachyury gene is induced up to 10 cell diameters from the activin source.
  • Long-range effects are directly mediated by activin signaling.

Conclusions:

  • Activin acts as a morphogen in Xenopus development.
  • Activin diffusion and gradient formation explain its long-range patterning capabilities.
  • Understanding activin signaling is crucial for comprehending embryonic development.