title: Neural crest specification by noncanonical Wnt signaling and PAR-1.
abstract: Neural crest (NC) cells are multipotent progenitors that form at the neural plate border, undergo epithelial-mesenchymal transition and migrate to diverse locations in vertebrate embryos to give rise to many cell types. Multiple signaling factors, including Wnt proteins, operate during early embryonic development to induce the NC cell fate. Whereas the requirement for the Wnt/β-catenin pathway in NC specification has been well established, a similar role for Wnt proteins that do not stabilize β-catenin has remained unclear. Our gain- and loss-of-function experiments implicate Wnt11-like proteins in NC specification in Xenopus embryos. In support of this conclusion, modulation of β-catenin-independent signaling through Dishevelled and Ror2 causes predictable changes in premigratory NC. Morpholino-mediated depletion experiments suggest that Wnt11R, a Wnt protein that is expressed in neuroectoderm adjacent to the NC territory, is required for NC formation. Wnt11-like signals might specify NC by altering the localization and activity of the serine/threonine polarity kinase PAR-1 (also known as microtubule-associated regulatory kinase or MARK), which itself plays an essential role in NC formation. Consistent with this model, PAR-1 RNA rescues NC markers in embryos in which noncanonical Wnt signaling has been blocked. These experiments identify novel roles for Wnt11R and PAR-1 in NC specification and reveal an unexpected connection between morphogenesis and cell fate.
authors: Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.
authors: Olga
authors: O
authors: Ossipova
authors: Sergei Y
authors: SY
authors: Sokol
mesh_terms: D000818:Animals; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D009024:Morphogenesis / Q000187:drug effects; D060172:Morpholinos / Q000494:pharmacology; D009432:Neural Crest / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D051153:Wnt Proteins / Q000378:metabolism*; D060449:Wnt Signaling Pathway / Q000187:drug effects / Q000502:physiology*; D029867:Xenopus Proteins / Q000378:metabolism*; D014982:Xenopus laevis / Q000254:growth & development* / Q000378:metabolism
chemical_list: D060172:Morpholinos; D051153:Wnt Proteins; D029867:Xenopus Proteins; C512785:wnt11b protein, Xenopus; C496647:MARK3 protein, Xenopus; D017346:Protein Serine-Threonine Kinases