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The complete chloroplast and mitochondrial DNA sequence of Ostreococcus tauri: organelle genomes of the smallest eukaryote are examples of compaction
Robbens, S.; Derelle, E.; Ferraz, C.; Wuyts, J.; Moreau, H.; Van de Peer, Y. (2007). The complete chloroplast and mitochondrial DNA sequence of Ostreococcus tauri: organelle genomes of the smallest eukaryote are examples of compaction. Mol. Biol. Evol. 24(4): 956-968. dx.doi.org/10.1093/molbev/msm012
In: Molecular Biology and Evolution. Oxford University Press: Chicago, Ill.. ISSN 0737-4038; e-ISSN 1537-1719, meer
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| Trefwoorden |
Chlorophyta [WoRMS]; Ostreococcus tauri C.Courties & M.-J.Chrétiennot-Dinet, 1995 [WoRMS]
Marien/Kust |
| Author keywords |
chloroplast genome; mitochondrial genome; Chlorophyta; Ostreococcustauri |
| Auteurs | | Top |
- Robbens, S., meer
- Derelle, E.
- Ferraz, C.
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- Wuyts, J.
- Moreau, H.
- Van de Peer, Y., meer
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| 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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