Article (Scientific journals)
Phylogenomic evidence for separate acquisition of plastids in cryptophytes, haptophytes, and stramenopiles
Baurain, Denis; Brinkmann, Henner; Petersen, Jorn et al.
2010In Molecular Biology and Evolution, 27 (7), p. 1698-709
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Abstract :
[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.
Disciplines :
Genetics & genetic processes
Phytobiology (plant sciences, forestry, mycology...)
Aquatic sciences & oceanology
Biochemistry, biophysics & molecular biology
Author, co-author :
Baurain, Denis  ;  Université de Liège - ULiège > 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 ;  Université de Liège - ULiège > 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
Language :
English
Title :
Phylogenomic evidence for separate acquisition of plastids in cryptophytes, haptophytes, and stramenopiles
Publication date :
July 2010
Journal title :
Molecular Biology and Evolution
ISSN :
0737-4038
eISSN :
1537-1719
Publisher :
Oxford University Press, New York, United States - New York
Volume :
27
Issue :
7
Pages :
1698-709
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
CÉCI - Consortium des Équipements de Calcul Intensif [BE]
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