SNP Polymorphism in Genomes of CC320 Isolates of Streptococcuspneumoniae Resistant to Beta-Lactams.

Bioinformatic analysis of the data on the genome sequencing of the isolates of the Streptococcuspneumoniae clonal complex SS320 from the Russian Federation, as well as the data on SS320 isolates from public sources in the penicillin resistant isolates resulted in detection of 139 missense mutations in 45 genes. In addition to the mutations in the genes of the main penicillin-binding proteins (PSB - PBP1A, PBP2B and PBP2X) there was detected high frequency of mutations in the genes of the (division and cell wall) dcw-cluster, as well as in RegR protein belonging to the transcription regulators of the LacI/GaIR family. Development of resistance to beta-lactams in S.pneumoniae is defined not only by modification of the PSB, but also by adaptive changes in the metabolic pathways involved in the bacterial cell growth and division.