Insertion sequences (IS) have been characterized in Microcystis aeruginosa gas vesicle-deficient mutants. ISMae4, a homolog of the cyanobacterial IS702, belongs to the IS5 family, subgroup ISL2. ISMae2 and ISMae3 display typical IS features and express a transposase of the IS4 and IS1 family, respectively. ISMae1 exhibits a more complex genetic structure and harbours a degenerated transposase gene distantly related to IS1 elements. Hybridizations with IS-specific DNA probes suggest that transposition of ISMae2 and ISMae3 occurred by a replicative-type mechanism. To our knowledge this is the first report showing that IS1 elements can be mobile in cyanobacteria.
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Carré‐Mlouka et al. (2004) studied this question.
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