A genomic approach to examine the complex evolution of laurasiatherian mammals.

Recent phylogenomic studies have failed to conclusively resolve certain branches of the placental mammalian tree, despite the evolutionary analysis of genomic data from 32 species. Previous analyses of single genes and retroposon insertion data yielded support for different phylogenetic scenarios fo...

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Autores principales:	Björn M Hallström, Adrian Schneider, Stefan Zoller, Axel Janke
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/12589922633c4bbc8a687824b69ae2ee
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spelling	oai:doaj.org-article:12589922633c4bbc8a687824b69ae2ee2021-11-18T07:33:11ZA genomic approach to examine the complex evolution of laurasiatherian mammals.1932-620310.1371/journal.pone.0028199https://doaj.org/article/12589922633c4bbc8a687824b69ae2ee2011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22164244/?tool=EBIhttps://doaj.org/toc/1932-6203Recent phylogenomic studies have failed to conclusively resolve certain branches of the placental mammalian tree, despite the evolutionary analysis of genomic data from 32 species. Previous analyses of single genes and retroposon insertion data yielded support for different phylogenetic scenarios for the most basal divergences. The results indicated that some mammalian divergences were best interpreted not as a single bifurcating tree, but as an evolutionary network. In these studies the relationships among some orders of the super-clade Laurasiatheria were poorly supported, albeit not studied in detail. Therefore, 4775 protein-coding genes (6,196,263 nucleotides) were collected and aligned in order to analyze the evolution of this clade. Additionally, over 200,000 introns were screened in silico, resulting in 32 phylogenetically informative long interspersed nuclear elements (LINE) insertion events. The present study shows that the genome evolution of Laurasiatheria may best be understood as an evolutionary network. Thus, contrary to the common expectation to resolve major evolutionary events as a bifurcating tree, genome analyses unveil complex speciation processes even in deep mammalian divergences. We exemplify this on a subset of 1159 suitable genes that have individual histories, most likely due to incomplete lineage sorting or introgression, processes that can make the genealogy of mammalian genomes complex. These unexpected results have major implications for the understanding of evolution in general, because the evolution of even some higher level taxa such as mammalian orders may sometimes not be interpreted as a simple bifurcating pattern.Björn M HallströmAdrian SchneiderStefan ZollerAxel JankePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 12, p e28199 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Björn M Hallström Adrian Schneider Stefan Zoller Axel Janke A genomic approach to examine the complex evolution of laurasiatherian mammals.
description	Recent phylogenomic studies have failed to conclusively resolve certain branches of the placental mammalian tree, despite the evolutionary analysis of genomic data from 32 species. Previous analyses of single genes and retroposon insertion data yielded support for different phylogenetic scenarios for the most basal divergences. The results indicated that some mammalian divergences were best interpreted not as a single bifurcating tree, but as an evolutionary network. In these studies the relationships among some orders of the super-clade Laurasiatheria were poorly supported, albeit not studied in detail. Therefore, 4775 protein-coding genes (6,196,263 nucleotides) were collected and aligned in order to analyze the evolution of this clade. Additionally, over 200,000 introns were screened in silico, resulting in 32 phylogenetically informative long interspersed nuclear elements (LINE) insertion events. The present study shows that the genome evolution of Laurasiatheria may best be understood as an evolutionary network. Thus, contrary to the common expectation to resolve major evolutionary events as a bifurcating tree, genome analyses unveil complex speciation processes even in deep mammalian divergences. We exemplify this on a subset of 1159 suitable genes that have individual histories, most likely due to incomplete lineage sorting or introgression, processes that can make the genealogy of mammalian genomes complex. These unexpected results have major implications for the understanding of evolution in general, because the evolution of even some higher level taxa such as mammalian orders may sometimes not be interpreted as a simple bifurcating pattern.
format	article
author	Björn M Hallström Adrian Schneider Stefan Zoller Axel Janke
author_facet	Björn M Hallström Adrian Schneider Stefan Zoller Axel Janke
author_sort	Björn M Hallström
title	A genomic approach to examine the complex evolution of laurasiatherian mammals.
title_short	A genomic approach to examine the complex evolution of laurasiatherian mammals.
title_full	A genomic approach to examine the complex evolution of laurasiatherian mammals.
title_fullStr	A genomic approach to examine the complex evolution of laurasiatherian mammals.
title_full_unstemmed	A genomic approach to examine the complex evolution of laurasiatherian mammals.
title_sort	genomic approach to examine the complex evolution of laurasiatherian mammals.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/12589922633c4bbc8a687824b69ae2ee
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A genomic approach to examine the complex evolution of laurasiatherian mammals.

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