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First published online July 19, 2004
doi: 10.1242/10.1242/dev.01284

Development 131, 3491-3499 (2004)
Published by The Company of Biologists 2004
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Review

Move it or lose it: axis specification in Xenopus

Carole Weaver and David Kimelman*

Department of Biochemistry, Box 357350, University of Washington, Seattle, WA 98195-7350, USA

* Author for correspondence (e-mail: kimelman{at}u.washington.edu)

SUMMARY

A long-standing question in developmental biology is how amphibians establish a dorsoventral axis. The prevailing view has been that cortical rotation is used to move a dorsalizing activity from the bottom of the egg towards the future dorsal side. We review recent evidence that kinesin-dependent movement of particles containing components of the Wnt intracellular pathway contributes to the formation of the dorsal organizer, and suggest that cortical rotation functions to align and orient microtubules, thereby establishing the direction of particle transport. We propose a new model in which active particle transport and cortical rotation cooperate to generate a robust movement of dorsal determinants towards the future dorsal side of the embryo.


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