Résumé
Xenopus is arguably the vertebrate model where the role of Wnt in early development has been most comprehensively studied. It has also served and still serves as a unique in vivo test tube to dissect the various branches of the Wnt pathway. This chapter represents an attempt to synthesize the large body of knowledge that has accumulated over the past two decades, focusing primarily on the fundamental role of Wnt signaling in the establishment of the basic body plan.