1887

Abstract

Cylindrospermopsin (CYN), a potent hepatoxin, occurs in freshwaters worldwide. Several cyanobacterial species produce the toxin, but the producing species vary between geographical regions. , a common algae species in temperate fresh and brackish waters, is one of the three well-documented CYN producers in European waters. So far, no genetic information on the CYN genes of this species has been available. Here, we describe the complete CYN gene cluster, including flanking regions from the German sp. strain 10E6 using a full genome sequencing approach by 454 pyrosequencing and bioinformatic identification of the gene cluster. In addition, we have sequenced a ∼7 kb fragment covering the genes (partially), and (partially) of the same gene cluster in the CYN-producing sp strains 10E9 and 22D11. Comparisons with the orthologous gene clusters of the Australian strains AWT205 and CS505 and the partial gene cluster of the Israeli strain ILC-146 revealed a high gene sequence similarity, but also extensive rearrangements of gene order. The high sequence similarity (generally higher than that of 16S rRNA gene fragments from the same strains), atypical GC-content and signs of transposase activities support the suggestion that the CYN genes have been horizontally transferred.

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2010-08-01
2020-01-29
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