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Title: WNT/β-Catenin Signalling and Epithelial Patterning in the Homoscleromorph Sponge Oscarella

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4];  [2];  [2];  [4];  [2]
  1. Aix-Marseille Univ., Marseille (France). Centre National de la Recherche Scientifique (CNRS). Centre d’Oceanologie de Marseille; DOE/OSTI
  2. Aix-Marseille Univ., Marseille (France). Centre National de la Recherche Scientifique (CNRS). Centre d’Oceanologie de Marseille
  3. 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
  4. 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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TCF/Lef regulates the Gsx ParaHox gene in central nervous system development in chordates journal March 2016
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Wnt signaling and polarity in freshwater sponges journal February 2018
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A Small Molecule Inhibitor of Src Family Kinases Promotes Simple Epithelial Differentiation of Human Pluripotent Stem Cells journal March 2013
Systematics and Molecular Phylogeny of the Family Oscarellidae (Homoscleromorpha) with Description of Two New Oscarella Species journal May 2013
Secreted frizzled related protein is a target of PaxB and plays a role in aquiferous system development in the freshwater sponge, Ephydatia muelleri journal February 2019
Evo-devo of non-bilaterian animals journal August 2015
The many faces and functions of β-catenin text January 2012