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The Zebrafish Glypican Knypek Controls Cell Polarity during Gastrulation Movements of Convergent Extension
Ist Teil von
Developmental cell, 2001-08, Vol.1 (2), p.251-264
Ort / Verlag
United States: Elsevier Inc
Erscheinungsjahr
2001
Quelle
MEDLINE
Beschreibungen/Notizen
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.