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Nodularia spumigena CCY9414

ABSTRACT: Nodularia spumigena CCY9414 Genome sequencing

PROVIDER: PRJNA185469 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR1571498.fastq.gz	Fastqsanger.gz
	SRR1572178.fastq.gz	Fastqsanger.gz
	SRR696127.fastq.gz	Fastqsanger.gz

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Project description:Nodularia spumigena is a toxic, filamentous cyanobacterium capable to fix atmospheric N2, which is often dominating cyanobacterial bloom events in the Baltic Sea and other brackish water systems worldwide. Phosphate (P) limitation has been considered as one environmental parameter that is somehow promoting the establishment of cyanobacterial mass developments. In the present study, we analyzed the response of the N. spumigena strain CCY9914 towards strong P limitation in an experimental approach. Filaments of N. spumigena were incubated under P-replete and P-deplete conditions for 21 days. Samples for RNA-seq were collected after 7 and 14 days. Growth of the strain was diminished under P-deplete conditions, however, filaments contained more polyphosphate under P-deplete compared to P-replete conditions. High polyphosphate contents were also detected within heterocysts. After 7 days, approximately 100 genes were upregulated in P-deplete filaments, among them was a high proportion of genes encoding proteins related to P-homeostasis such as transport systems for different P species. Many of these genes became also up-regulated after 14 days compared to 7 days in filaments grown under P-replete conditions, which was consistent with the almost complete consumption of dissolved P in these cultures after 14 days. In addition to genes directly related to P starvation, for example genes encoding proteins for bioactive compound synthesis, gas vesicle formation, or sugar catabolism were stimulated under the P-deplete conditions. Collectively, our data permitted to describe an experimentally validated P-stimulon in N. spumigena CCY9914 and provide evidence that severe P limitation could indeed support bloom formation by this filamentous strain.

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Project description:Thus far, the negative effects of Nodularia spumigena blooms on aquatic organisms have been mainly attributed to the production of the hepatotoxic nodularin (NOD). In the current work, the accumulation of other N. spumigena metabolites in blue mussels and crustaceans, and their effect on Thamnocephalus platyurus and Artemia franciscana, were examined. The liquid chromatography-tandem mass spectrometry (LC-MS/MS) analyses provided evidence that both blue mussels collected after a cyanobacterial bloom in the Baltic Sea and the crustaceans exposed under laboratory conditions to N. spumigena extract accumulated the cyclic anabaenopeptins (APs). In the crustaceans, the linear peptides, spumigins (SPUs) and aeruginosins (AERs), were additionally detected. Exposure of T. platyurus and A. franciscana to N. spumigena extract confirmed the negative effect of nodularin on the organisms. However, high numbers of dead crustaceans were also recorded in the nodularin-free fraction, which contained protease inhibitors classified to spumigins and aeruginosins. These findings indicate that cyanobacterial toxicity to aquatic organisms is a complex phenomenon and the induced effects can be attributed to diverse metabolites, not only to the known hepatotoxins.

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