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Phylogenetic associations of ISAa1 and IS150-like insertion sequences in Actinobacillus actinomycetemcomitans

Department of Medical Microbiology and Immunology, University of Aarhus, The Bartholin Building, DK-8000 Aarhus C, Denmark¹
Department of Preventive Dentistry, Nagasaki University School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan²

Author for correspondence: Mogens Kilian. Tel: +45 89421735. Fax: +45 86176128. e-mail: kilian{at}microbiology.au.dk

The distribution and number of two insertion sequences (ISs), ISAa1 and an IS150-like element, in the genomes of a collection of Actinobacillus actinomycetemcomitans strains previously subjected to population genetic analysis were determined to obtain information about their stability and biological significance. The hybridization patterns revealed that these IS elements are widespread in the genome of A. actinomycetemcomitans strains and that their occurrence agrees with the overall population structure of the species. While the patterns of ISAa1 showed significant evolutionary stability, the IS150-like element showed evidence of intra-genomic variability even within members of the previously identified high-toxicity JP2 clone. Searching of the available genome sequence of strain HK1651 of the JP2 clone (www.genome.ou.edu/act.html) revealed close proximity of the IS elements to housekeeping genes, but no evidence of structural disruption of genes or integrations that may be presumed to influence pathogenic potential.

Keywords: Actinobacillus actinomycetemcomitans, insertion sequence, population structure, intra-strain recombination

Abbreviations: IS, insertion sequence; MLEE, multilocus enzyme electrophoresis

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