The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.

Although free living, members of the successful SAR11 group of marine alpha-proteobacteria contain a very small and A+T rich genome, two features that are typical of mitochondria and related obligate intracellular parasites such as the Rickettsiales. Previous phylogenetic analyses have suggested tha...

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Autores principales:	Naiara Rodríguez-Ezpeleta, T Martin Embley
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b48afe01c57d4555b0b43b6d07fb2b48
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spelling	oai:doaj.org-article:b48afe01c57d4555b0b43b6d07fb2b482021-11-18T07:29:36ZThe SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.1932-620310.1371/journal.pone.0030520https://doaj.org/article/b48afe01c57d4555b0b43b6d07fb2b482012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22291975/?tool=EBIhttps://doaj.org/toc/1932-6203Although free living, members of the successful SAR11 group of marine alpha-proteobacteria contain a very small and A+T rich genome, two features that are typical of mitochondria and related obligate intracellular parasites such as the Rickettsiales. Previous phylogenetic analyses have suggested that Candidatus Pelagibacter ubique, the first cultured member of this group, is related to the Rickettsiales+mitochondria clade whereas others disagree with this conclusion. In order to determine the evolutionary position of the SAR11 group and its relationship to the origin of mitochondria, we have performed phylogenetic analyses on the concatenation of 24 proteins from 5 mitochondria and 71 proteobacteria. Our results support that SAR11 group is not the sistergroup of the Rickettsiales+mitochondria clade and confirm that the position of this group in the alpha-proteobacterial tree is strongly affected by tree reconstruction artefacts due to compositional bias. As a consequence, genome reduction and bias toward a high A+T content may have evolved independently in the SAR11 species, which points to a different direction in the quest for the closest relatives to mitochondria and Rickettsiales. In addition, our analyses raise doubts about the monophyly of the newly proposed Pelagibacteraceae family.Naiara Rodríguez-EzpeletaT Martin EmbleyPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 1, p e30520 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Naiara Rodríguez-Ezpeleta T Martin Embley The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
description	Although free living, members of the successful SAR11 group of marine alpha-proteobacteria contain a very small and A+T rich genome, two features that are typical of mitochondria and related obligate intracellular parasites such as the Rickettsiales. Previous phylogenetic analyses have suggested that Candidatus Pelagibacter ubique, the first cultured member of this group, is related to the Rickettsiales+mitochondria clade whereas others disagree with this conclusion. In order to determine the evolutionary position of the SAR11 group and its relationship to the origin of mitochondria, we have performed phylogenetic analyses on the concatenation of 24 proteins from 5 mitochondria and 71 proteobacteria. Our results support that SAR11 group is not the sistergroup of the Rickettsiales+mitochondria clade and confirm that the position of this group in the alpha-proteobacterial tree is strongly affected by tree reconstruction artefacts due to compositional bias. As a consequence, genome reduction and bias toward a high A+T content may have evolved independently in the SAR11 species, which points to a different direction in the quest for the closest relatives to mitochondria and Rickettsiales. In addition, our analyses raise doubts about the monophyly of the newly proposed Pelagibacteraceae family.
format	article
author	Naiara Rodríguez-Ezpeleta T Martin Embley
author_facet	Naiara Rodríguez-Ezpeleta T Martin Embley
author_sort	Naiara Rodríguez-Ezpeleta
title	The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
title_short	The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
title_full	The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
title_fullStr	The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
title_full_unstemmed	The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.
title_sort	sar11 group of alpha-proteobacteria is not related to the origin of mitochondria.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/b48afe01c57d4555b0b43b6d07fb2b48
work_keys_str_mv	AT naiararodriguezezpeleta thesar11groupofalphaproteobacteriaisnotrelatedtotheoriginofmitochondria AT tmartinembley thesar11groupofalphaproteobacteriaisnotrelatedtotheoriginofmitochondria AT naiararodriguezezpeleta sar11groupofalphaproteobacteriaisnotrelatedtotheoriginofmitochondria AT tmartinembley sar11groupofalphaproteobacteriaisnotrelatedtotheoriginofmitochondria
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The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria.

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