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The Cyanotoxin BMAA Induces Heterocyst Specific Gene Expression in Anabaena sp PCC 7120 under Repressive Conditions
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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Number of Authors: 62018 (English)In: Toxins, ISSN 2072-6651, E-ISSN 2072-6651, Vol. 10, no 11, article id 478Article in journal (Refereed) Published
Abstract [en]

Cyanobacteria synthesize neurotoxic -N-methylamino-l-alanine (BMAA). The roles of this non-protein amino acid in cyanobacterial cells are insufficiently studied. During diazotrophic growth, filamentous cyanobacteria form single differentiated cells, called heterocysts, which are separated by approximately 12-15 vegetative cells. When combined nitrogen is available, heterocyst formation is blocked and cyanobacterial filaments contain only vegetative cells. In the present study, we discovered that exogenous BMAA induces the process of heterocyst formation in filamentous cyanobacteria under nitrogen-replete conditions that normally repress cell differentiation. BMAA treated cyanobacteria form heterocyst-like dark non-fluorescent non-functional cells. It was found that glutamate eliminates the BMAA mediated derepression. Quantitative polymerase chain reaction (qPCR) permitted to detect the BMAA impact on the transcriptional activity of several genes that are implicated in nitrogen assimilation and heterocyst formation in Anabaena sp. PCC 7120. We demonstrated that the expression of several essential genes increases in the BMAA presence under repressive conditions.

Place, publisher, year, edition, pages
2018. Vol. 10, no 11, article id 478
Keywords [en]
BMAA, cyanobacteria, cyanotoxin, heterocyst differentiation, gene expression
National Category
Cell and Molecular Biology
Identifiers
URN: urn:nbn:se:su:diva-162876DOI: 10.3390/toxins10110478ISI: 000451315900057PubMedID: 30453523OAI: oai:DiVA.org:su-162876DiVA, id: diva2:1274117
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2018-12-28Bibliographically approved

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