The origin of mitochondria in light of a fluid prokaryotic chromosome model

Eßer, Christian; Martin, William; Dagan, Tal

doi:10.1098/rsbl.2006.0582

Cited by 89 publications

(83 citation statements)

References 32 publications

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“…5A) rooxydans) and was assigned to a novel Proteobacteria subdivision that was informally termed magnetococci (110 (108,110), the overall topologies of these trees do not differ with regard to the position of Mc. marinus.…”

Section: Alphaproteobacteriamentioning

confidence: 99%

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Lefèvre

Bazylinski

2013

Microbiol Mol Biol Rev

376

388

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SUMMARY Magnetotactic bacteria (MTB) are widespread, motile, diverse prokaryotes that biomineralize a unique organelle called the magnetosome. Magnetosomes consist of a nano-sized crystal of a magnetic iron mineral that is enveloped by a lipid bilayer membrane. In cells of almost all MTB, magnetosomes are organized as a well-ordered chain. The magnetosome chain causes the cell to behave like a motile, miniature compass needle where the cell aligns and swims parallel to magnetic field lines. MTB are found in almost all types of aquatic environments, where they can account for an important part of the bacterial biomass. The genes responsible for magnetosome biomineralization are organized as clusters in the genomes of MTB, in some as a magnetosome genomic island. The functions of a number of magnetosome genes and their associated proteins in magnetosome synthesis and construction of the magnetosome chain have now been elucidated. The origin of magnetotaxis appears to be monophyletic; that is, it developed in a common ancestor to all MTB, although horizontal gene transfer of magnetosome genes also appears to play a role in their distribution. The purpose of this review, based on recent progress in this field, is focused on the diversity and the ecology of the MTB and also the evolution and transfer of the molecular determinants involved in magnetosome formation.

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Section: Alphaproteobacteriamentioning

confidence: 99%

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Lefèvre

Bazylinski

2013

Microbiol Mol Biol Rev

376

388

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“…This might be because HGT-based prokaryotic recombination, as opposed to sex-based eukaryotic recombination, leads to chimeric pangenomes where individual genes frequently have different phylogenetic histories. That is, the eubacterial partners in these putative, ancient, hybridization events would have been chimerical organisms to start with [38,39].…”

Section: Evidence For Ancient Gene Flows and Genome Chimerization In mentioning

confidence: 99%

Horizontal gene flow from Eubacteria to Archaebacteria and what it means for our understanding of eukaryogenesis

Akanni

Siu-Ting

Creevey

et al. 2015

Phil. Trans. R. Soc. B

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One contribution of 17 to a theme issue 'Eukaryotic origins: progress and challenges'. The origin of the eukaryotic cell is considered one of the major evolutionary transitions in the history of life. Current evidence strongly supports a scenario of eukaryotic origin in which two prokaryotes, an archaebacterial host and an a-proteobacterium (the free-living ancestor of the mitochondrion), entered a stable symbiotic relationship. The establishment of this relationship was associated with a process of chimerization, whereby a large number of genes from the a-proteobacterial symbiont were transferred to the host nucleus. A general framework allowing the conceptualization of eukaryogenesis from a genomic perspective has long been lacking. Recent studies suggest that the origins of several archaebacterial phyla were coincident with massive imports of eubacterial genes. Although this does not indicate that these phyla originated through the same process that led to the origin of Eukaryota, it suggests that Archaebacteria might have had a general propensity to integrate into their genomes large amounts of eubacterial DNA. We suggest that this propensity provides a framework in which eukaryogenesis can be understood and studied in the light of archaebacterial ecology. We applied a recently developed supertree method to a genomic dataset composed of 392 eubacterial and 51 archaebacterial genera to test whether large numbers of genes flowing from Eubacteria are indeed coincident with the origin of major archaebacterial clades. In addition, we identified two potential large-scale transfers of uncertain directionality at the base of the archaebacterial tree. Our results are consistent with previous findings and seem to indicate that eubacterial gene imports (particularly from d-Proteobacteria, Clostridia and Actinobacteria) were an important factor in archaebacterial history. Archaebacteria seem to have long relied on Eubacteria as a source of genetic diversity, and while the precise mechanism that allowed these imports is unknown, we suggest that our results support the view that processes comparable to those through which eukaryotes emerged might have been common in archaebacterial history.

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“…Mitochondria are a unique feature of eukaryotes, though not all eukaryotes possess mitochondria [65][66][67][68][69]. For some time, it was thought that many lineages of eukaryotes that lacked mitochondria were primitively amitochondriate [70].…”

Section: What Is the Problem With Trees In Prokaryotic Evolution?mentioning

confidence: 99%

The ring of life hypothesis for eukaryote origins is supported by multiple kinds of data

McInerney

Pisani

O’Connell

2015

Phil. Trans. R. Soc. B

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One contribution of 17 to a theme issue 'Eukaryotic origins: progress and challenges'. The literature is replete with manuscripts describing the origin of eukaryotic cells. Most of the models for eukaryogenesis are either autogenous (sometimes called slow-drip), or symbiogenic (sometimes called big-bang). In this article, we use large and diverse suites of 'Omics' and other data to make the inference that autogeneous hypotheses are a very poor fit to the data and the origin of eukaryotic cells occurred in a single symbiosis.

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The origin of mitochondria in light of a fluid prokaryotic chromosome model

Cited by 89 publications

References 32 publications

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Horizontal gene flow from Eubacteria to Archaebacteria and what it means for our understanding of eukaryogenesis

The ring of life hypothesis for eukaryote origins is supported by multiple kinds of data

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