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Ectodermal Wnt function as a neural crest inducer.

Martín I García-Castro1, Christophe Marcelle, Marianne Bronner-Fraser

  • 1Division of Biology 139-74, California Institute of Technology, Wilson and California, Pasadena, CA 91125, USA. mig1000@its.caltech.edu

Science (New York, N.Y.)
|August 6, 2002
PubMed
Summary
This summary is machine-generated.

Wnt signaling is essential for neural crest cell development in avian embryos. These Wnt molecules are sufficient to induce neural crest formation from naive neural plates, highlighting their critical role.

Keywords:
Non-programmatic

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Embryology

Background:

  • Neural crest cells are crucial for peripheral nervous system and facial skeleton development.
  • Neural crest induction involves inductive interactions at the neural plate/ectodermal border.
  • Wnt and bone morphogenetic protein (BMP) signaling pathways are implicated in neural crest induction in other species.

Purpose of the Study:

  • To investigate the role of Wnt signaling in neural crest cell induction in avian embryos.
  • To determine if Wnt molecules are sufficient to induce neural crest cells.
  • To compare the inductive capabilities of Wnts and BMPs in avian neural crest formation.

Main Methods:

  • Localization of Wnt6 mRNA in the avian ectoderm.
  • In vivo inhibition of Wnt signaling to assess its effect on neural crest formation.
  • In vitro induction of neural crest cells from naive neural plates using Wnts and BMPs in defined media.

Main Results:

  • Wnt6 was found to be localized in the ectoderm of avian embryos.
  • Inhibition of Wnt signaling disrupted neural crest formation.
  • Wnts alone could induce neural crest cells from naive neural plates in vitro without additional factors.
  • BMPs required additives for neural crest induction in vitro.

Conclusions:

  • Wnt molecules are necessary for neural crest formation in avian embryos.
  • Wnt signaling is sufficient to induce neural crest cells from naive neural plates.
  • Wnts play a primary role in avian neural crest induction compared to BMPs.