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MBE Advance Access originally published online on April 17, 2007
Molecular Biology and Evolution 2007 24(7):1528-1536; doi:10.1093/molbev/msm074
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Research Articles

Organization of the Mitochondrial Genome in the Dinoflagellate Amphidinium carterae

Edmund A. Nash, Adrian C. Barbrook, Rachel K. Edwards-Stuart1, Kaj Bernhardt, Christopher J. Howe and R. Ellen R. Nisbet

Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom

E-mail: rern2{at}mole.bio.cam.ac.uk.

Accepted for publication April 4, 2007.

We have characterized the mitochondrial genome of the dinoflagellate Amphidinium carterae. It contains just 3 identifiable protein-coding genes: cox1, cox3, and cob. No evidence for rRNA or tRNA genes was found. Expressed sequence tags (EST) sequences for the 3 genes suggest that RNA editing occurs in 2 cases removing an in-frame stop codon. Two of the transcripts (cob and cox1) lack a stop codon at the end of the gene. The genome contains a large amount of noncoding DNA including many fragmented copies of all the 3 genes and large numbers of inverted repeats. The genome, which contains about 70% AT, has undergone extensive recombination, possibly due to the inverted repeats. The highly reduced mitochondrial gene content supports the relationship of the dinoflagellates and apicomplexa as sister groups.

Key Words: alveolate • Amphidinium operculatum • Amphidinium carterae • dinoflagellate • mitochondrion

1 Present address: Division of Food Sciences, University of Nottingham, Loughborough, United Kingdom.

Martin Embley, Associate Editor


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