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The Complete Chloroplast and Mitochondrial DNA Sequence of Ostreococcus tauri: Organelle Genomes of the Smallest Eukaryote are Examples of Compaction.

Abstract : The complete nucleotide sequence of the mt (mitochondrial) and cp (chloroplast) genomes of the unicellular green alga Ostreococcus tauri has been determined. The mt genome assembles as a circle of 44,237 bp and contains 65 genes. With an overall average length of only 42 bp for the intergenic regions, this is the most gene-dense mt genome of all Chlorophyta. Furthermore, it is characterized by a unique segmental duplication, encompassing 22 genes and covering 44% of the genome. Such a duplication has not been observed before in green algae, although it is also present in the mt genomes of higher plants. The quadripartite cp genome forms a circle of 71,666 bp, containing 86 genes divided over a larger and a smaller single-copy region, separated by 2 inverted repeat sequences. Based on genome size and number of genes, the Ostreococcus cp genome is the smallest known among the green algae. Phylogenetic analyses based on a concatenated alignment of cp, mt, and nuclear genes confirm the position of O. tauri within the Prasinophyceae, an early branch of the Chlorophyta.
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https://hal.archives-ouvertes.fr/hal-00141854
Contributor : Catherine Larose <>
Submitted on : Monday, June 14, 2021 - 4:40:59 PM
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S. Robbens, Evelyne Derelle, C. Ferraz, J. Wuyts, H. Moreau, et al.. The Complete Chloroplast and Mitochondrial DNA Sequence of Ostreococcus tauri: Organelle Genomes of the Smallest Eukaryote are Examples of Compaction.. Molecular Biology and Evolution, Oxford University Press (OUP), 2007, 24 (4), pp.956-968. ⟨10.1093/molbev/msm012⟩. ⟨hal-00141854⟩

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