1887

Abstract

Two strains of previously unknown Gram-negative cocci, T1-7 and S6-16, were isolated from the oral cavity of healthy Japanese children. The two strains showed atypical phenotypic characteristics of members of the genus , including catalase production. Sequencing of their 16S rRNA genes confirmed that they belong to genus . Under anaerobic conditions, the two strains produced acetic acid and propionic acid as metabolic end-products in a trypticase–yeast extract–haemin medium containing 1 % (w/v) glucose, 1 % (w/v) fructose and 1 % (v/v) sodium lactate. Comparative analysis of the 16S rRNA, , and gene sequences revealed that the two strains are phylogenetically homogeneous and comprise a distinct, novel lineage within the genus . The sequences from the two strains shared the highest similarity, at 99.9, 95.8, 96.9 and 96.7 %, using the partial 16S rRNA, , and gene sequences, respectively, with the type strains of the two most closely related species, ATCC 17748 and JCM 31738. Furthermore, strain T1-7 shared the highest average nucleotide identity (ANI) value (94.06 %) with type strain of the most closely related species, . At the same time, strain T1-7 showed the highest digital DNA–DNA hybridization (dDDH) value (55.5 %) with the type strain of . The two strains reported in this study were distinguished from the previously reported species from the genus based on catalase production, partial , and sequences, average ANI and dDDH values. Based on these observations, the two strains represent a novel species, for which the name sp. nov. is proposed. The type strain is T1-7 (JCM 33966=CCUG 74597).

Funding
This study was supported by the:
  • Kato Memorial Bioscience Foundation
    • Principle Award Recipient: IzumiMashima
  • Yakult Bio-Science Foundation
    • Principle Award Recipient: IzumiMashima
  • Japan Society for the Promotion of Science (Award 19K18975)
    • Principle Award Recipient: IzumiMashima
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2020-12-02
2021-08-02
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