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Reiterated Wnt signaling during zebrafish neural crest development
Jessica L Lewis1, Jennifer Bonner, Melinda Modrell
1Molecular and Cellular Biology Program, University of Washington School of Medicine, Seattle, WA 98195, USA.
Development (Cambridge, England)
|February 20, 2004
Summary
Wnt signaling is crucial for initiating neural crest development in zebrafish. This study identifies a specific early window for Wnt action, distinct from later pigment cell specification.
Area of Science:
- Developmental biology
- Molecular signaling
Background:
- Wnt/beta-catenin signaling is implicated in neural crest cell development.
- The precise timing and specific Wnts involved remain largely uncharacterized.
Purpose of the Study:
- To delineate the critical temporal window for Wnt/beta-catenin signaling in neural crest induction.
- To identify the specific Wnt ligand responsible for initiating neural crest formation.
Main Methods:
- Utilized a zebrafish line with an inducible Wnt/beta-catenin signaling inhibitor.
- Administered inhibition at specific developmental time points.
- Performed transplantation experiments and utilized antisense morpholino oligonucleotides.
Main Results:
- Identified a critical period for Wnt signaling during initial neural crest induction, separate from pigment cell specification.
- Demonstrated that neural crest precursors require direct Wnt signal transduction.
- Showed that Wnt8 expression coincides with this critical period and its inhibition disrupts neural crest marker expression.
Conclusions:
- Wnt signals are essential for the initial induction of zebrafish neural crest.
- Wnt signaling plays reiterated roles throughout neural crest development.