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Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias.

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Title: Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias.
Authors: Laumer CE; Wellcome Trust Sanger Institute, Hinxton, United Kingdom.; European Molecular Biology Laboratories-European Bioinformatics Institute, Hinxton, United Kingdom., Gruber-Vodicka H; Max Planck Institute for Marine Microbiology, Bremen, Germany., Hadfield MG; Kewalo Marine Laboratory, Pacific Biosciences Research Center and the University of Hawaii-Manoa, Honolulu, United States., Pearse VB; Institute of Marine Sciences, University of California, Santa Cruz, United States., Riesgo A; Invertebrate Division, Life Sciences Department, The Natural History Museum, London, United Kingdom., Marioni JC; Wellcome Trust Sanger Institute, Hinxton, United Kingdom.; European Molecular Biology Laboratories-European Bioinformatics Institute, Hinxton, United Kingdom.; Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, United Kingdom., Giribet G; Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, United States.
Source: ELife [Elife] 2018 Oct 30; Vol. 7. Date of Electronic Publication: 2018 Oct 30.
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Language: English
Journal Info: Publisher: eLife Sciences Publications, Ltd Country of Publication: England NLM ID: 101579614 Publication Model: Electronic Cited Medium: Internet ISSN: 2050-084X (Electronic) Linking ISSN: 2050084X NLM ISO Abbreviation: Elife Subsets: MEDLINE
Imprint Name(s): Original Publication: Cambridge, UK : eLife Sciences Publications, Ltd., 2012-
MeSH Terms: Bias* , Phylogeny*, Base Composition/*genetics , Cnidaria/*classification , Cnidaria/*genetics , Placozoa/*classification , Placozoa/*genetics, Animals ; Bayes Theorem ; Likelihood Functions ; Metagenome ; Models, Genetic
Abstract: The phylogenetic placement of the morphologically simple placozoans is crucial to understanding the evolution of complex animal traits. Here, we examine the influence of adding new genomes from placozoans to a large dataset designed to study the deepest splits in the animal phylogeny. Using site-heterogeneous substitution models, we show that it is possible to obtain strong support, in both amino acid and reduced-alphabet matrices, for either a sister-group relationship between Cnidaria and Placozoa, or for Cnidaria and Bilateria as seen in most published work to date, depending on the orthologues selected to construct the matrix. We demonstrate that a majority of genes show evidence of compositional heterogeneity, and that support for the Cnidaria + Bilateria clade can be assigned to this source of systematic error. In interpreting these results, we caution against a peremptory reading of placozoans as secondarily reduced forms of little relevance to broader discussions of early animal evolution.
Competing Interests: CL, HG, MH, VP, AR, JM, GG No competing interests declared
(© 2018, Laumer et al.)
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Contributed Indexing: Keywords: Bilateria; Cnidaria; Placozoa; Trichoplax; compositional heterogeneity; evolutionary biology; phylogeny
Entry Date(s): Date Created: 20181031 Date Completed: 20190328 Latest Revision: 20190610
Update Code: 20221216
PubMed Central ID: PMC6277202
DOI: 10.7554/eLife.36278
PMID: 30373720
Database: MEDLINE
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ISSN:2050-084X
DOI:10.7554/eLife.36278