| Literature DB >> 11290326 |
Y Kawakami1, J Capdevila, D Büscher, T Itoh, C Rodríguez Esteban, J C Izpisúa Belmonte.
Abstract
A regulatory loop between the fibroblast growth factors FGF-8 and FGF-10 plays a key role in limb initiation and AER induction in vertebrate embryos. Here, we show that three WNT factors signaling through beta-catenin act as key regulators of the FGF-8/FGF-10 loop. The Wnt-2b gene is expressed in the intermediate mesoderm and the lateral plate mesoderm in the presumptive chick forelimb region. Cells expressing Wnt-2b are able to induce Fgf-10 and generate an extra limb when implanted into the flank. In the presumptive hindlimb region, another Wnt gene, Wnt-8c, controls Fgf-10 expression, and is also capable of inducing ectopic limb formation in the flank. Finally, we also show that the induction of Fgf-8 in the limb ectoderm by FGF-10 is mediated by the induction of Wnt-3a. Thus, three WNT signals mediated by beta-catenin control both limb initiation and AER induction in the vertebrate embryo.Entities:
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Year: 2001 PMID： 11290326 DOI： 10.1016/s0092-8674(01)00285-9
Source DB: PubMed Journal: Cell ISSN： 0092-8674 Impact factor: 41.582