MOLECULAR-GENETIC CHARACTERISTICS OF SHIGELLA SONNEI-2013 STRAIN ISOLATED DURING THE OUTBREAK IN DYSENTERY IN THE REPUBLIC ABKHAZIA IN 2013

Aim. Study of molecular-genetic properties of Shigella sonnei-2013 strain isolated during the outbreak in dysentery in the republic Abkhazia in 2013. Materials and methods. Genetic typing of the tested strains using multilocus sequence typing (MLST). Analyzed of nucleotide sequence fragments 7 of conservative «housekeeping» genes adk, fumC, icd, mdh, purA, recA, gyrB. Sequenced of DNA fragments compared with reference sequences from database of Escherichia coli MLST. Phylogenetic analysis was performed using UPGMA method and computer program START 2. Whole-genome sequencing performed on a genetic analyzer Ion Torrent Personal Genome Machine (PGM™) using fragment libraries (shot-gun). Aligning reads have been carried out with the program GS Reference Mapper. Results. Defined sequence - type of the studied strain - ST-152, one of the most common genotypes for S. sonnei. Demonstrated the high degree of similarity obtained contig to the sequences of the chromosome and plasmids А, В, С и E strains S. sonnei 53G and S. sonnei Ss046. Identified contigs with a high percentage similarity to the sequence of virulence plasmid p026-Vir of E. coli 026:H11 (H30). In the genomic S. sonnei-2013 revealed nucleotide sequence of 136 genes were found located on the p026-Vir strain of E. coli 026:Н11 (НЗО). Discovered genes controlling biosynthesis of type IV pili involved in adhesion to abiotic surfaces and biofilm formation. Conclusion. Identified structural peculiarities of strain induced by fragments of virulence plasmid p026-Vir strain E. coli 026:H 11 (H30).

S. sonnei, MLST-генотипирование, dysentery, S. sonnei, MLST genotyping, whole-genome sequencing