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.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Robbens S,Derelle E,Ferraz C,Wuyts J,Moreau H,Van de Peer Ydoi
10.1093/molbev/msm012subject
Has Abstractpub_date
2007-04-01 00:00:00pages
956-68issue
4eissn
0737-4038issn
1537-1719pii
msm012journal_volume
24pub_type
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