An ancestral mitochondrial DNA resembling a eubacterial genome in miniature

B. Franz Lang, Gertraud Burger, Charles J. O'Kelly, Robert Cedergren, G. Brian Golding, Claude Lemieux, David Sankoff, Monique Turmel and Michael W. Gray
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B. Franz Lang: Université de Montréal
Gertraud Burger: Université de Montréal
Charles J. O'Kelly: Bigelow Laboratory for Ocean Sciences
Robert Cedergren: Université de Montréal
G. Brian Golding: McMaster University
Claude Lemieux: niversité Laval
Monique Turmel: niversité Laval
Michael W. Gray: Dalhousie University

Nature, 1997, vol. 387, issue 6632, 493-497

Abstract: Abstract Mitochondria, organelles specialized in energy conservation reactions in eukaryotic cells, have evolved from eubacteria-like endo-symbionts 1–3 whose closest known relatives are the rickettsial group of α-proteobacteria 4,5. Because characterized mitochondrial genomes vary markedly in structure3, it has been impossible to infer from them the initial form of the proto-mitochondrial genome. This would require the identification of minimally derived mitochondrial DNAs that better reflect the ancestral state. Here we describe such a primitive mitochondrial genome, in the freshwater protozoon Reclinomonas americana6. This protist displays ultrastructural characteristics that ally it with the retortamonads7,8, a protozoan group that lacks mitochondria8,9. R. americana mtDNA (69,034 base pairs) contains the largest collection of genes (97) so far identified in any mtDNA, including genes for 5S ribosomal RNA, the RNA component of RNase P, and at least 18 proteins not previously known to be encoded in mitochondria. Most surprising are four genes specifying a multisubunit, eubacterial-type RNA polymerase. Features of gene content together with eubacterial characteristics of genome organization and expression not found before in mitochondrial genomes indicate that R. americana mtDNA more closely resembles the ancestral proto-mitochondrial genome than any other mtDNA investigated to date.

Date: 1997
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DOI: 10.1038/387493a0

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