1887

Abstract

Three isolates of a previously reported novel catalase-negative, Gram-stain-positive, coccoid, alpha-haemolytic, species that were associated with meningoencephalitis in naïve weanling mice were further evaluated to confirm their taxonomic status and to determine additional phenotypic and molecular characteristics. Comparative 16S rRNA gene sequence analysis showed nearly identical intra-species sequence similarity (≥99.9 %), and revealed the closest phylogenetically related species, and , with 97.0 and 97.5 % sequence similarity, respectively. The , and genes were identical for the three isolates and were 87.6, 85.7 and 82.5 % similar to and 89.7, 86.2 and 80.7 % similar to , respectively. DNA–DNA hybridization analyses of mouse isolate 12-5202 against CCUG 27296 and CCUG 65085 produced estimated values of 26.4 and 25.7 % relatedness, and the calculated average nucleotide identity values were 81.9 and 81.7, respectively. These data confirm the taxonomic status of 12-5202 as a distinct species, and we formally propose the type strain, 12-5202 (=CCUG 69378=DSM 103678). The genome of sp. nov. 12-5202 contains 2062 total genes with a size of 2.34 Mbp, and an average G+C content of 42.76 mol%.

Keyword(s): firmicutes , mice , Streptococcus and taxonomy
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2017-12-01
2024-03-28
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