Extreme enlargement of the inverted repeat region in the plastid genomes of diatoms from the genus Climaconeis
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We sequenced the plastid genomes of three diatoms from the genus Climaconeis, including
two strains formerly designated as Climaconeis scalaris. At 208,097 and 216,580 bp, the plastid genomes
of the latter strains are the largest ever sequenced among diatoms and their increased size is explained
by the massive expansion of the inverted repeat region. Important rearrangements of gene order
were identified among the two populations of Climaconeis cf. scalaris. The other sequenced Climaconeis
chloroplast genome is 1.5 times smaller compared with those of the Climaconeis cf. scalaris strains and
it features an usual quadripartite structure. The extensive structural changes reported here for the
genus Climaconeis are compared with those previously observed for other algae and plants displaying
large plastid genomes.
two strains formerly designated as Climaconeis scalaris. At 208,097 and 216,580 bp, the plastid genomes
of the latter strains are the largest ever sequenced among diatoms and their increased size is explained
by the massive expansion of the inverted repeat region. Important rearrangements of gene order
were identified among the two populations of Climaconeis cf. scalaris. The other sequenced Climaconeis
chloroplast genome is 1.5 times smaller compared with those of the Climaconeis cf. scalaris strains and
it features an usual quadripartite structure. The extensive structural changes reported here for the
genus Climaconeis are compared with those previously observed for other algae and plants displaying
large plastid genomes.