The complete chloroplast genome sequence of the chlorophycean green alga Scenedesmus obliquus reveals a compact gene organization and a biased distribution of genes on the two DNA strands |
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Authors: | Jean-Charles de Cambiaire Christian Otis Claude Lemieux Monique Turmel |
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Institution: | (1) Dpartement de biochimie et de microbiologie, Universit Laval, Qubec, Canada |
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Abstract: | Background The phylum Chlorophyta contains the majority of the green algae and is divided into four classes. While the basal position
of the Prasinophyceae is well established, the divergence order of the Ulvophyceae, Trebouxiophyceae and Chlorophyceae (UTC)
remains uncertain. The five complete chloroplast DNA (cpDNA) sequences currently available for representatives of these classes
display considerable variability in overall structure, gene content, gene density, intron content and gene order. Among these
genomes, that of the chlorophycean green alga Chlamydomonas reinhardtii has retained the least ancestral features. The two single-copy regions, which are separated from one another by the large
inverted repeat (IR), have similar sizes, rather than unequal sizes, and differ radically in both gene contents and gene organizations
relative to the single-copy regions of prasinophyte and ulvophyte cpDNAs. To gain insights into the various changes that underwent
the chloroplast genome during the evolution of chlorophycean green algae, we have sequenced the cpDNA of Scenedesmus obliquus, a member of a distinct chlorophycean lineage. |
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