Russian strains of group B streptococci are different in the content and organization of the PAI-A and PAI-A1 pathogenicity islands

Abstract

Group B streptococci, or Streptococcus agalactiae, are the major cause of severe diseases in newborns and adults. The PAI-A and PAI-A1 pathogenicity islands containing the sspB1 and sspB1a genes, respectively, were found among group B streptococci mobile genetic elements. The presence of sspB genes correlates with urogenital tract infections. The aim of this study was to determine the frequency of group B streptococci strains with the PAI-A and PAI-A1 pathogenicity islands, circulating in Moscow, in comparison with strains from St. Petersburg. The sspB1 gene, and hence the PAI-A pathogenicity island, was not found in the genomes of strains from Moscow. The frequency of the sspB1a gene and the PAI-A1 pathogenicity island in the genomes of clinical strains was three times higher than in the genomes of colonizing strains. Thus, it can be assumed that the genes of the sspB family are more specific of group B streptococci colonizing pregnant women and newborns.

Keywords

group B streptococci / PAI-A and PAI-A1 pathogenicity islands / sspB1 and sspB1a genes

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