Survey of extrachromosomal DNA found in the filamentous cyanobacteria

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Abstract
Cleared lysates of 13 spp. of filamentous cyanobacteria were examined for the presence of extrachromosomal DNA by using agarose gel electrophoresis and ethidium bromide staining. Seven of the 13 spp. contained extrachromosomal covalently closed circular DNA, and all but 1 sp. contained multiple elements. There was no correlation between the presence of extrachromosomal DNA and either the range of metabolic activities found in the cyanobacteria or the differentiated cell types or structures elaborated by the morphologically complex filamentous cyanobacteria.