Nov 13, 2001

The zebrafish glypican knypek controls cell polarity during gastrulation movements of convergent extension

Developmental Cell
Jacek TopczewskiLilianna Solnica-Krezel


Mutations in the zebrafish knypek locus impair gastrulation movements of convergent extension that narrow embryonic body and elongate it from head to tail. We demonstrate that knypek regulates cellular movements but not cell fate specification. Convergent extension movement defects in knypek are associated with abnormal cell polarity, as mutant cells fail to elongate and align medio-laterally. Positional cloning reveals that knypek encodes a member of the glypican family of heparan sulfate proteoglycans. Double mutant and overexpression analyses show that Knypek potentiates Wnt11 signaling, mediating convergent extension. These studies provide experimental and genetic evidence that glypican Knypek acts during vertebrate gastrulation as a positive modulator of noncanonical Wnt signaling to establish polarized cell behaviors underlying convergent extension movements.

Mentioned in this Paper

WNT11 gene
Tertiary Protein Structure
Polarized Cell
Homologous Sequences, Amino Acid
Zebrafish Proteins
Plasma Protein Binding Capacity

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