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.

BMC Evolutionary Biology
Jean-Charles de CambiaireMonique Turmel

Abstract

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. The 161,452 bp IR-containing genome of Scenedesmus features single-copy regions of similar sizes, encodes 96 gen...Continue Reading

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Citations

Sep 1, 2006·Molecular Genetics and Genomics : MGG·Anne-Sophie BélangerMonique Turmel
Apr 7, 2009·The Journal of Biological Chemistry·Benoit DerrienOlivier Vallon
Feb 22, 2008·Nucleic Acids Research·Surya SahaDaniel G Peterson
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Jul 4, 2015·Genome Biology and Evolution·Monique TurmelClaude Lemieux
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May 5, 2021·Journal of AOAC International·Shanshan LiuXiasheng Zheng

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Datasets Mentioned

BETA
AY835431
DQ396875

Software Mentioned

GCG Wisconsin
WU
BLAST
GCG
RepeatMasker
GRIMM
REPuter
EMBOSS
AUTOASSEMBLER
RepeatFinder

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