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EST based phylogenomics of Syndermata questions monophyly of Eurotatoria

BACKGROUND: The metazoan taxon Syndermata comprising Rotifera (in the classical sense of Monogononta+Bdelloidea+Seisonidea) and Acanthocephala has raised several hypotheses connected to the phylogeny of these animal groups and the included subtaxa. While the monophyletic origin of Syndermata and Aca...

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Autores principales: Witek, Alexander, Herlyn, Holger, Meyer, Achim, Boell, Louis, Bucher, Gregor, Hankeln, Thomas
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2654452/
https://www.ncbi.nlm.nih.gov/pubmed/19113997
http://dx.doi.org/10.1186/1471-2148-8-345
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author Witek, Alexander
Herlyn, Holger
Meyer, Achim
Boell, Louis
Bucher, Gregor
Hankeln, Thomas
author_facet Witek, Alexander
Herlyn, Holger
Meyer, Achim
Boell, Louis
Bucher, Gregor
Hankeln, Thomas
author_sort Witek, Alexander
collection PubMed
description BACKGROUND: The metazoan taxon Syndermata comprising Rotifera (in the classical sense of Monogononta+Bdelloidea+Seisonidea) and Acanthocephala has raised several hypotheses connected to the phylogeny of these animal groups and the included subtaxa. While the monophyletic origin of Syndermata and Acanthocephala is well established based on morphological and molecular data, the phylogenetic position of Syndermata within Spiralia, the monophyletic origin of Monogononta, Bdelloidea, and Seisonidea and the acanthocephalan sister group are still a matter of debate. The comparison of the alternative hypotheses suggests that testing the phylogenetic validity of Eurotatoria (Monogononta+Bdelloidea) is the key to unravel the phylogenetic relations within Syndermata. The syndermatan phylogeny in turn is a prerequisite for reconstructing the evolution of the acanthocephalan endoparasitism. RESULTS: Here we present our results from a phylogenomic approach studying i) the phylogenetic position of Syndermata within Spiralia, ii) the monophyletic origin of monogononts and bdelloids and iii) the phylogenetic relations of the latter two taxa to acanthocephalans. For this analysis we have generated EST libraries of Pomphorhynchus laevis, Echinorhynchus truttae (Acanthocephala) and Brachionus plicatilis (Monogononta). By extending these data with database entries of B. plicatilis, Philodina roseola (Bdelloidea) and 25 additional metazoan species, we conducted phylogenetic reconstructions based on 79 ribosomal proteins using maximum likelihood and bayesian approaches. Our findings suggest that the phylogenetic position of Syndermata within Spiralia is close to Platyhelminthes, that Eurotatoria are not monophyletic and that bdelloids are more closely related to acanthocephalans than monogononts. CONCLUSION: Mapping morphological character evolution onto molecular phylogeny suggests the (partial or complete) reduction of the corona and the emergence of a retractable anterior end (rostrum, proboscis) before the separation of Acanthocephala. In particular, the evolution of a rostrum might have been a key event leading to the later evolution of the acanthocephalan endoparasitism, given the enormous relevance of the proboscis for anchoring of the adults to the definitive hosts' intestinal wall.
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spelling pubmed-26544522009-03-12 EST based phylogenomics of Syndermata questions monophyly of Eurotatoria Witek, Alexander Herlyn, Holger Meyer, Achim Boell, Louis Bucher, Gregor Hankeln, Thomas BMC Evol Biol Research Article BACKGROUND: The metazoan taxon Syndermata comprising Rotifera (in the classical sense of Monogononta+Bdelloidea+Seisonidea) and Acanthocephala has raised several hypotheses connected to the phylogeny of these animal groups and the included subtaxa. While the monophyletic origin of Syndermata and Acanthocephala is well established based on morphological and molecular data, the phylogenetic position of Syndermata within Spiralia, the monophyletic origin of Monogononta, Bdelloidea, and Seisonidea and the acanthocephalan sister group are still a matter of debate. The comparison of the alternative hypotheses suggests that testing the phylogenetic validity of Eurotatoria (Monogononta+Bdelloidea) is the key to unravel the phylogenetic relations within Syndermata. The syndermatan phylogeny in turn is a prerequisite for reconstructing the evolution of the acanthocephalan endoparasitism. RESULTS: Here we present our results from a phylogenomic approach studying i) the phylogenetic position of Syndermata within Spiralia, ii) the monophyletic origin of monogononts and bdelloids and iii) the phylogenetic relations of the latter two taxa to acanthocephalans. For this analysis we have generated EST libraries of Pomphorhynchus laevis, Echinorhynchus truttae (Acanthocephala) and Brachionus plicatilis (Monogononta). By extending these data with database entries of B. plicatilis, Philodina roseola (Bdelloidea) and 25 additional metazoan species, we conducted phylogenetic reconstructions based on 79 ribosomal proteins using maximum likelihood and bayesian approaches. Our findings suggest that the phylogenetic position of Syndermata within Spiralia is close to Platyhelminthes, that Eurotatoria are not monophyletic and that bdelloids are more closely related to acanthocephalans than monogononts. CONCLUSION: Mapping morphological character evolution onto molecular phylogeny suggests the (partial or complete) reduction of the corona and the emergence of a retractable anterior end (rostrum, proboscis) before the separation of Acanthocephala. In particular, the evolution of a rostrum might have been a key event leading to the later evolution of the acanthocephalan endoparasitism, given the enormous relevance of the proboscis for anchoring of the adults to the definitive hosts' intestinal wall. BioMed Central 2008-12-29 /pmc/articles/PMC2654452/ /pubmed/19113997 http://dx.doi.org/10.1186/1471-2148-8-345 Text en Copyright ©2008 Witek et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Witek, Alexander
Herlyn, Holger
Meyer, Achim
Boell, Louis
Bucher, Gregor
Hankeln, Thomas
EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title_full EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title_fullStr EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title_full_unstemmed EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title_short EST based phylogenomics of Syndermata questions monophyly of Eurotatoria
title_sort est based phylogenomics of syndermata questions monophyly of eurotatoria
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2654452/
https://www.ncbi.nlm.nih.gov/pubmed/19113997
http://dx.doi.org/10.1186/1471-2148-8-345
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