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Related Experiment Videos

Nodal signaling patterns the organizer.

K Gritsman1, W S Talbot, A F Schier

  • 1Developmental Genetics Program, Skirball Institute of Biomolecular Medicine, Department of Cell Biology, New York University School of Medicine, New York, NY 10016, USA.

Development (Cambridge, England)
|February 9, 2000
PubMed
Summary

Differential Nodal signaling patterns the Spemann

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Area of Science:

  • Developmental biology
  • Embryology
  • Genetics

Background:

  • Spemann's organizer is crucial for vertebrate embryo patterning.
  • Organizer cells form the prechordal plate and notochord during gastrulation.
  • Anteroposterior polarity is established before gastrulation.

Purpose of the Study:

  • To investigate the role of Nodal signaling in establishing anteroposterior polarity within the Spemann's organizer.
  • To determine how differential Nodal signaling levels correlate with specific cell fate specification.

Main Methods:

  • Fate mapping and gene expression analysis in zebrafish.
  • Overexpression and antagonist studies of nodal-related genes (cyclops, squint).
  • Analysis of mutants for the Nodal signaling cofactor gene one-eyed pinhead (oep).

Main Results:

  • Prechordal plate progenitors express goosecoid and are located near the margin.
  • Notochord precursors express floating head and are located further from the margin.
  • Differential Nodal signaling levels dictate goosecoid and floating head expression, influencing cell fate decisions.

Conclusions:

  • Nodal signaling establishes anteroposterior pattern in the organizer before gastrulation.
  • High Nodal activity specifies anterior fates (prechordal plate), while lower activity specifies posterior fates (notochord).
  • Sustained Nodal signaling is required for prechordal plate development, whereas transient signaling suffices for notochord development.

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