Abstract
A new method of strain differentiation in Streptococcus agalactiae is proposed in this work. It is based on revealing the polymorphism of structure of gene sak0192 encoding a hypothetical protein, which in different strains of Str. agalactiae contains a different number of regularly alternating repeats and spacer sites having sizes of 16 and 44 bp, respectively. The sequences of forward repeats are mostly identical, while spacers are characterized with expressed heterogeneity. In general, the structure of gene sak0192 is similar to one of sites with direct repeats and spacers in genomes of Mycobacterium tuberculosis and Str. pyogenes. The possibility of using polymorphism of sak0192 in both identification of species affiliation and intraspecific differentiation of Str. agalactiae strains is demonstrated.
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