Reference : Phylogenomic evidence for separate acquisition of plastids in cryptophytes, haptophytes,...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
Life sciences : Aquatic sciences & oceanology
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Genetics & genetic processes
http://hdl.handle.net/2268/70706
Phylogenomic evidence for separate acquisition of plastids in cryptophytes, haptophytes, and stramenopiles
English
Baurain, Denis mailto [Université de Liège - ULg > Département des Sciences de la Vie > Algologie, Mycologie et Systématique Expérimentale > >]
Brinkmann, Henner [Université de Montréal - UdeM > Département de Biochimie > > >]
Petersen, Jorn [Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH - DSMZ > > > >]
Rodriguez-Ezpeleta, Naiara [Université de Montréal - UdeM > Département de Biochimie > > >]
Stechmann, Alexandra [Dalhousie University > Department of Biochemistry and Molecular Biology > > >]
Demoulin, Vincent mailto [Université de Liège - ULg > Département des Sciences de la Vie > Algologie, Mycologie et Systématique Expérimentale > > >]
Roger, Andrew J. [Dalhousie University > Department of Biochemistry and Molecular Biology > > >]
Burger, Gertraud [Université de Montréal - UdeM > Département de Biochimie > > >]
Lang, B. Franz [Université de Montréal - UdeM > Département de Biochimie > > >]
Philippe, Herve [Université de Montréal - UdeM > Département de Biochimie > > >]
Jul-2010
Molecular Biology and Evolution
Oxford University Press
27
7
1698-709
Yes (verified by ORBi)
International
0737-4038
1537-1719
New York
NY
[en] According to the chromalveolate hypothesis (Cavalier-Smith T. 1999. Principles of protein and lipid targeting in secondary symbiogenesis: euglenoid, dinoflagellate, and sporozoan plastid origins and the eukaryote family tree. J Eukaryot Microbiol 46:347-366), the four eukaryotic groups with chlorophyll c-containing plastids originate from a single photosynthetic ancestor, which acquired its plastids by secondary endosymbiosis with a red alga. So far, molecular phylogenies have failed to either support or disprove this view. Here, we devise a phylogenomic falsification of the chromalveolate hypothesis that estimates signal strength across the three genomic compartments: If the four chlorophyll c-containing lineages indeed derive from a single photosynthetic ancestor, then similar amounts of plastid, mitochondrial, and nuclear sequences should allow to recover their monophyly. Our results refute this prediction, with statistical support levels too different to be explained by evolutionary rate variation, phylogenetic artifacts, or endosymbiotic gene transfer. Therefore, we reject the chromalveolate hypothesis as falsified in favor of more complex evolutionary scenarios involving multiple higher order eukaryote-eukaryote endosymbioses.
http://hdl.handle.net/2268/70706
10.1093/molbev/msq059
http://mbe.oxfordjournals.org/cgi/content/full/27/7/1698

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