Phylogenomic evidence for a common ancestor of mitochondria and the SAR11 clade
Open Access
- 14 June 2011
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 1 (1), 13
- https://doi.org/10.1038/srep00013
Abstract
Mitochondria share a common ancestor with the Alphaproteobacteria, but determining their precise origins is challenging due to inherent difficulties in phylogenetically reconstructing ancient evolutionary events. Nonetheless, phylogenetic accuracy improves with more refined tools and expanded taxon sampling. We investigated mitochondrial origins with the benefit of new, deeply branching genome sequences from the ancient and prolific SAR11 clade of Alphaproteobacteria and publicly available alphaproteobacterial and mitochondrial genome sequences. Using the automated phylogenomic pipeline Hal, we systematically studied the effect of taxon sampling and missing data to accommodate small mitochondrial genomes. The evidence supports a common origin of mitochondria and SAR11 as a sister group to the Rickettsiales. The simplest explanation of these data is that mitochondria evolved from a planktonic marine alphaproteobacterial lineage that participated in multiple inter-specific cell colonization events, in some cases yielding parasitic relationships, but in at least one case producing a symbiosis that characterizes modern eukaryotic life.This publication has 55 references indexed in Scilit:
- The α-proteobacteria: the Darwin finches of the bacterial worldBiology Letters, 2009
- Phylogenomic analyses support the monophyly of Excavata and resolve relationships among eukaryotic “supergroups”Proceedings of the National Academy of Sciences of the United States of America, 2009
- Unique glycine‐activated riboswitch linked to glycine–serine auxotrophy in SAR11Environmental Microbiology, 2009
- Phylogenomics reveals a new ‘megagroup’ including most photosynthetic eukaryotesBiology Letters, 2008
- IMG/M: a data management and analysis system for metagenomesNucleic Acids Research, 2007
- The origin of mitochondria in light of a fluid prokaryotic chromosome modelBiology Letters, 2006
- RAxML-VI-HPC: maximum likelihood-based phylogenetic analyses with thousands of taxa and mixed modelsBioinformatics, 2006
- ProtTest: selection of best-fit models of protein evolutionBioinformatics, 2005
- MUSCLE: multiple sequence alignment with high accuracy and high throughputNucleic Acids Research, 2004
- Cultivation of the ubiquitous SAR11 marine bacterioplankton cladeNature, 2002