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Related Experiment Videos

Models for organizer and notochord formation.

H Meinhardt1

  • 1Max-Planck-Institut für Entwicklungsbiologie, Tübingen, Germany. hans.meinhardt@tuebingen.mpg.de

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|April 1, 2000
PubMed
Summary

Models explain how organizing regions form in developing organisms. These regions use self-enhancement and long-range inhibition to direct cell fate and pattern formation, seen in embryos and regeneration.

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Area of Science:

  • Developmental biology
  • Cell signaling
  • Pattern formation

Background:

  • Organizing regions are crucial for directing cell fate in higher organisms.
  • Previous models proposed self-enhancement and long-range inhibition for organizer generation.
  • Recent discoveries support these mechanisms in primary pattern formation.

Purpose of the Study:

  • To discuss models for generating cellular organizing regions.
  • To explain the role of self-enhancement and long-range inhibition in pattern formation.
  • To provide examples of these models in biological development.

Main Methods:

  • Theoretical modeling of cell signaling pathways.
  • Analysis of pattern regulation phenomena.
  • Review of experimental evidence for molecular interactions.

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Main Results:

  • Models involving local self-enhancement and long-range inhibition explain organizer formation.
  • Mutual down-regulation of noggin/chordin and BMP-4 acts as indirect self-enhancement.
  • These principles apply to primary pattern formation, substructure generation, and pattern regulation.

Conclusions:

  • Self-enhancement and long-range inhibition are fundamental to generating organizing regions.
  • These mechanisms explain diverse developmental processes like embryo formation and regeneration.
  • The model accounts for the formation of extended structures and the displacement of organizers.