WNT/β-Catenin Signalling and Epithelial Patterning in the Homoscleromorph Sponge Oscarella
- Aix-Marseille Univ., Marseille (France). Centre National de la Recherche Scientifique (CNRS). Centre d’Oceanologie de Marseille; DOE/OSTI
- Aix-Marseille Univ., Marseille (France). Centre National de la Recherche Scientifique (CNRS). Centre d’Oceanologie de Marseille
- Aix-Marseille Univ., Marseille (France). Centre National de la Recherche Scientifique (CNRS). Centre d’Oceanologie de Marseille; St. Petersburg State Univ. (Russian Federation). Faculty of Biology and Soils
- Univ. Pierre et Marie Curie, Paris (France). Centre National de la Recherche Scientifique (CNRS). Biologie du Developpement. Observatoire Oceanologique
Sponges branch basally in the metazoan phylogenetic tree and are thus well positioned to provide insights into the evolution of mechanisms controlling animal development, likely to remain active in adult sponges. Of the four sponge clades, the Homoscleromorpha are of particular interest as they alone show the ‘‘true’’ epithelial organization seen in other metazoan phyla (the Eumetazoa). We have examined the deployment in sponges of Wnt signalling pathway components, since this pathway is an important regulator of many developmental patterning processes. We identified a reduced repertoire of three divergent Wnt ligand genes in the recently-sequenced Amphimedon queenslandica (demosponge) genome and two Wnts from our EST collection from the homoscleromorph Oscarella lobularis, along with well-conserved genes for intracellular pathway components (b-catenin, GSK3β). Remarkably, the two O. lobularis Wnt genes showed complementary expression patterns in relation to the evenly spaced ostia (canal openings) of the exopinacoderm (ectoderm), highly reminiscent of Wnt expression during skin appendage formation in vertebrates. Furthermore, experimental activation of the Wnt/β-catenin pathway using GSK3β inhibitors provoked formation of ectopic ostia, as has been shown for epithelial appendages in Eumetazoa. We thus suggest that deployment of Wnt signalling is a common and perhaps ancient feature of metazoan epithelial patterning and morphogenesis.
- Research Organization:
- USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI ID:
- 1627373
- Journal Information:
- PLoS ONE, Journal Name: PLoS ONE Journal Issue: 6 Vol. 4; ISSN 1932-6203
- Publisher:
- Public Library of ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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