Identification of hepatotoxin-producing cyanobacteria by DNA-chip

Environmental Microbiology
Anne RantalaKaarina Sivonen

Abstract

We developed a new tool to detect and identify hepatotoxin-producing cyanobacteria of the genera Anabaena, Microcystis, Planktothrix, Nostoc and Nodularia. Genus-specific probe pairs were designed for the detection of the microcystin (mcyE) and nodularin synthetase genes (ndaF) of these five genera to be used with a DNA-chip. The method couples a ligation detection reaction, in which the polymerase chain reaction (PCR)-amplified mcyE/ndaF genes are recognized by the probe pairs, with a hybridization on a universal microarray. All the probe pairs specifically detected the corresponding mcyE/ndaF gene sequences when DNA from the microcystin- or nodularin-producing cyanobacterial strains were used as template in the PCR. Furthermore, the strict specificity of detection enabled identification of the potential hepatotoxin producers. Detection of the genes was very sensitive; only 1-5 fmol of the PCR product were needed to produce signal intensities that exceeded the set background threshold level. The genus-specific probe pairs also reliably detected potential microcystin producers in DNA extracted from six lake and four brackish water samples. In lake samples, the same microcystin producers were identified with quantitative real-ti...Continue Reading

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Mar 25, 2010·Analytical and Bioanalytical Chemistry·J F HumbertM Gugger
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