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The mitochondrial genome of the brown alga Laminaria digitata: a comparative analysis

Published online by Cambridge University Press:  16 December 2002

MARIE-PIERRE OUDOT-LE SECQ
Affiliation:
UMR 1931, CNRS and Laboratoires Goëmar, Station Biologique de Roscoff, B.P. 74, 29682 ROSCOFF Cedex, France
BERNARD KLOAREG
Affiliation:
UMR 1931, CNRS and Laboratoires Goëmar, Station Biologique de Roscoff, B.P. 74, 29682 ROSCOFF Cedex, France
SUSAN LOISEAUX-DE GOËR
Affiliation:
UMR 1931, CNRS and Laboratoires Goëmar, Station Biologique de Roscoff, B.P. 74, 29682 ROSCOFF Cedex, France
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Abstract

We report here the complete sequence of the mitochondrial genome of the brown alga Laminaria digitata (Hudson) J.V. Lamouroux. L. digitata mtDNA is a circular molecule of 38,007 bp (64·9% A+T), encoding 63 genes and 3 ORFs and with only 6·7% of non-coding sequences. Based on gene content and order, its overall organization is very similar to that of the mitochondrial genome of Pylaiella littoralis, another brown alga belonging to a different sublineage of the Phaeophyceae. In particular, the two genomes share unusual features, which hence could be unique to brown algae among the heterokont lineage, namely the presence of a rn5 gene, a short nad11 gene, a cox2 gene with a large in-frame insertion and α-proteobacterial-like promoter sequences. On the other hand, L. digitata lacks the sequences which are thought to have been transmitted horizontally to the P. littoralis genome, that is, the group-II introns in the rnl and cox1 genes, and it features only traces of an ancestral T7-like RNA polymerase. Distance phylogenetic trees inferred from concatenated mitochondrial genes confirm that speciation of brown algae occurred recently compared to other heterokonts.

Type
Research Article
Copyright
© 2002 British Phycological Society

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