Streptococcus vaginalis strain:P1L01 Genome sequencing and assembly. Streptococcus vaginalis strain:P1L01

Sequences targeted at the V3 and V4 16S rRNA hypervariable regions of a streptococcal strain (P1L01) isolated from vaginal swabs of a pregnant woman with diabetes were 100% similar to those of Streptococcus anginosus subsp. whileyi. However, phylogenetic analysis based on 16S rRNA full-gene sequencing (1562 bp) revealed highest sequence similarity to Streptococcus periodonticum (98.65%), followed by Streptococcus anginosus subsp. whileyi (98.65 %), and Streptococcus anginosus subsp. anginosus (98.44%). Phylogenies of housekeeping genes rpoB and groEL were compared to improve classification, and the results showed a clear separation between strain P1L01T and closely related Streptococcus type strains. The complete genome of strain P1L01T consisted of 2,108,769 bp with a G+C content of 38.5 mol%. Average nucleotide identity values, based on genome sequencing, between strain P1L01T and Streptococcus periodonticum KCOM 2412T, Streptococcus anginosus subsp. whileyi CCUG 39159, and Streptococcus anginosus subsp. anginosus NCTC 10713 were 95.48%, 94.33%, and 95.28%, respectively. The highest in silico DNA-DNA hybridization value with respect to the closest species was 66.2%, i.e., below the species cut-off of 70% hybridization. On the basis of phylogenetic, genotypic and phenotypic data, we propose to classify this isolate as representative of a novel species of the genus Streptococcus, Streptococcus vaginalis sp. nov., in reference to its isolation from vaginal swabs, with strain P1L01 as the type strain.