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Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias
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-het...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
eLife Sciences Publications, Ltd
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277202/ https://www.ncbi.nlm.nih.gov/pubmed/30373720 http://dx.doi.org/10.7554/eLife.36278 |
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author | Laumer, Christopher E Gruber-Vodicka, Harald Hadfield, Michael G Pearse, Vicki B Riesgo, Ana Marioni, John C Giribet, Gonzalo |
author_facet | Laumer, Christopher E Gruber-Vodicka, Harald Hadfield, Michael G Pearse, Vicki B Riesgo, Ana Marioni, John C Giribet, Gonzalo |
author_sort | Laumer, Christopher E |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6277202 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | eLife Sciences Publications, Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-62772022018-12-05 Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias Laumer, Christopher E Gruber-Vodicka, Harald Hadfield, Michael G Pearse, Vicki B Riesgo, Ana Marioni, John C Giribet, Gonzalo eLife Evolutionary Biology 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. eLife Sciences Publications, Ltd 2018-10-30 /pmc/articles/PMC6277202/ /pubmed/30373720 http://dx.doi.org/10.7554/eLife.36278 Text en © 2018, Laumer et al http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited. |
spellingShingle | Evolutionary Biology Laumer, Christopher E Gruber-Vodicka, Harald Hadfield, Michael G Pearse, Vicki B Riesgo, Ana Marioni, John C Giribet, Gonzalo Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title | Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title_full | Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title_fullStr | Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title_full_unstemmed | Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title_short | Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias |
title_sort | support for a clade of placozoa and cnidaria in genes with minimal compositional bias |
topic | Evolutionary Biology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277202/ https://www.ncbi.nlm.nih.gov/pubmed/30373720 http://dx.doi.org/10.7554/eLife.36278 |
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