Abstract
Randomly amplified polymorphic DNA PCR was used to generate unique and identifying DNA profiles for members of the cyanobacterial genera Anabaena and Microcystis, which are responsible for much of the production of nuisance blooms in various freshwater systems, including recreational and drinking water supplies. A method based on the combination of two 10-mer oligonucleotides in a single PCR was developed to provide specific and repeatable DNA fingerprints for cyanobacterial isolates. The strain-specific randomly amplified polymorphic DNA profiles made it possible to discriminate among all toxigenic cyanobacteria studied to the three taxonomic levels of genus, species, and strain. Analysis of DNA typing results obtained by the described method clearly distinguishes between the genera Anabaena and Microcystis. The markers produced for each strain were also applied to a phylogenetic analysis to infer genetic relatedness in this group of prokaryotes.
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