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| Content Provider | PubMed Central |
|---|---|
| Author | Egger, Bernhard Steinke, Dirk Tarui, Hiroshi Mulder, Katrien De Arendt, Detlev Borgonie, Gaëtan Funayama, Noriko Gschwentner, Robert Hartenstein, Volker Bert, Hobmayer Hooge, Matthew Martina, Hrouda Ishida, Sachiko Kobayashi, Chiyoko Georg, Kuales Nishimura, Osamu Pfister, Daniela Rieger, Reinhard Salvenmoser, Willi Smith, Julian Ulrich, Technau Tyler, Seth Agata, Kiyokazu Walter, Salzburger Peter, Ladurner |
| Editor | Michalak, Pawel |
| Copyright Year | 2009 |
| Abstract | Since first described, acoels were considered members of the flatworms (Platyhelminthes). However, no clear synapomorphies among the three large flatworm taxa - the Catenulida, the Acoelomorpha and the Rhabditophora - have been characterized to date. Molecular phylogenies, on the other hand, commonly positioned acoels separate from other flatworms. Accordingly, our own multi-locus phylogenetic analysis using 43 genes and 23 animal species places the acoel flatworm Isodiametra pulchra at the base of all Bilateria, distant from other flatworms. By contrast, novel data on the distribution and proliferation of stem cells and the specific mode of epidermal replacement constitute a strong synapomorphy for the Acoela plus the major group of flatworms, the Rhabditophora. The expression of a piwi-like gene not only in gonadal, but also in adult somatic stem cells is another unique feature among bilaterians. These two independent stem-cell-related characters put the Acoela into the Platyhelminthes-Lophotrochozoa clade and account for the most parsimonious evolutionary explanation of epidermal cell renewal in the Bilateria. Most available multigene analyses produce conflicting results regarding the position of the acoels in the tree of life. Given these phylogenomic conflicts and the contradiction of developmental and morphological data with phylogenomic results, the monophyly of the phylum Platyhelminthes and the position of the Acoela remain unresolved. By these data, both the inclusion of Acoela within Platyhelminthes, and their separation from flatworms as basal bilaterians are well-supported alternatives. |
| Related Links | http://dx.doi.org/10.1371/journal.pone.0005502 |
| Starting Page | 5502 |
| File Format | |
| ISSN | 19326203 |
| e-ISSN | 19326203 |
| Journal | PLoS ONE |
| Issue Number | 5 |
| Volume Number | 4 |
| Language | English |
| Publisher | Public Library of Science |
| Publisher Date | 2009-05-01 |
| Access Restriction | Open |
| Rights Holder | Public Library of Science |
| Subject Keyword | Biochemistry, Genetics and Molecular Biology(all) Agricultural and Biological Sciences(all) Medicine(all) Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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