Skip to main content
Article thumbnail
Location of Repository

Ectodermal Wnt3/β-catenin signaling is required for the establishment and maintenance of the apical ectodermal ridge

By J. Barrow, K. Thomas, O. Boussadia-Zahui, R. Moore, R. Kemler, M. Capecchi and A. McMahon

Abstract

The formation of the apical ectodermal ridge (AER) is critical for the distal outgrowth and patterning of the vertebrate limb. Recent work in the chick has demonstrated that interplay between the Wnt and Fgf signaling pathways is essential in the limb mesenchyme and ectoderm in the establishment and perhaps the maintenance of the AER. In the mouse, whereas a role for Fgfs for AER establishment and function has been clearly demonstrated, the role of Wnt/β-catenin signaling, although known to be important, is obscure. In this study, we demonstrate that Wnt3, which is expressed ubiquitously throughout the limb ectoderm, is essential for normal limb development and plays a critical role in the establishment of the AER. We also show that the conditional removal of β-catenin in the ventral ectodermal cells is sufficient to elicit the mutant limb phenotype. In addition, removing β-catenin after the induction of the ridge results in the disappearance of the AER, demonstrating the requirement for continued β-catenin signaling for the maintenance of this structure. Finally, we demonstrate that Wnt/β-catenin signaling lies upstream of the Bmp signaling pathway in establishment of the AER and regulation of the dorsoventral polarity of the limb

Year: 2003
OAI identifier: oai:escidoc.org:escidoc:2349761
Provided by: MPG.PuRe
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://hdl.handle.net/11858/00... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.