Molecular characterization of a novel putative pathogen, Streptococcus nakanoensis sp. nov., isolated from sputum culture.

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  • Additional Information
    • Source:
      Publisher: ASM Press Country of Publication: United States NLM ID: 101634614 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 2165-0497 (Electronic) Linking ISSN: 21650497 NLM ISO Abbreviation: Microbiol Spectr Subsets: MEDLINE
    • Publication Information:
      Original Publication: Washington, DC : ASM Press, 2013-
    • Subject Terms:
      Sputum*/microbiology ; Streptococcus*/genetics ; Streptococcus*/isolation & purification ; Streptococcus*/classification ; Streptococcus*/pathogenicity ; Streptococcus*/drug effects; Humans ; Phylogeny ; Streptococcus pneumoniae/genetics ; Streptococcus pneumoniae/isolation & purification ; Streptococcus pneumoniae/classification ; Streptococcus pneumoniae/pathogenicity ; Anti-Bacterial Agents/pharmacology ; Microbial Sensitivity Tests ; Whole Genome Sequencing ; Genome, Bacterial/genetics ; Streptococcal Infections/microbiology ; Streptococcal Infections/veterinary ; Streptolysins/genetics ; Streptolysins/metabolism ; Bacterial Proteins/genetics ; Lung/microbiology ; Male ; Virulence/genetics ; Quinine/analogs & derivatives
    • Abstract:
      Reports of novel species of α-hemolytic Streptococcus have increased recently. However, limited information exists regarding the pathogenicity of these species, with the exception of Streptococcus pneumoniae and Streptococcus pseudopneumoniae . In this study, a quinolone-resistant α- Streptococcus strain, MTG105, was isolated from the sputum of a patient with pneumonia. This strain was first identified as S. pneumoniae at the hospital laboratory; however, it exhibited unique genetic features upon further analysis. Digital DNA-DNA hybridization and average nucleotide identity based on BLAST values from whole-genome sequencing revealed MTG105 to be a novel species closely related to S. pseudopneumoniae . Although MTG105 carried two copies of the pneumolysin gene, similar to S. pseudopneumoniae , this isolate exhibited susceptibility to optochin under both aerobic and 5% CO 2 conditions. Notably, no biochemical features could be used to definitively identify this species. In an infection assay using organotypic lung tissue models, MTG105 induced epithelial damage comparable to that of S. pneumoniae and S. pseudopneumoniae , possibly suggesting its potential as a pathogenic α- Streptococcus . The natural transformation abilities of Streptococcus species facilitate their exchange of genes within the same genus, resulting in the existence of species with increasingly more diverse genome structures. Therefore, the identification of this species highlights the importance of monitoring the emergence of novel species exhibiting virulence and/or multidrug resistance. This isolate was proposed as a novel species, designated Streptococcus nakanoensis sp. nov. The type strain was MTG 105 T (= JCM 35953 T = CCUG 76894 T ).
      Importance: The genus Streptococcus encompasses a wide range of bacteria with more than 60 species. Recently, there has been a notable increase in reports of novel species of α- Streptococcus based on genomic analysis data. However, limited information exists regarding the pathogenicity of these species. In this study, a quinolone-resistant α-hemolytic Streptococcus strain, MTG105, was isolated from a patient with pneumonia. Genetic analysis revealed that this species was a novel species closely related to S. pseudopneumoniae . In an infection assay using organotypic lung tissue models, MTG105 induced epithelial damage comparable to that caused by S. pneumoniae and S. pseudopneumoniae , strongly suggesting its potential as a pathogenic α- Streptococcus . The natural transformation abilities of Streptococcus species facilitate gene exchange within the same genus, leading to the emergence of species with increasingly diverse genome structures. Therefore, the identification of this species underscores the importance of monitoring the emergence of novel species exhibiting virulence and/or multidrug resistance.
      Competing Interests: The authors declare no conflict of interest.
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    • Grant Information:
      19K08964 MEXT | Japan Society for the Promotion of Science (JSPS); Encouragement Award Japan Antibiotic Research Association
    • Contributed Indexing:
      Keywords: Streptococcus; multidrug resistance; pathogenesis
    • Accession Number:
      0 (Anti-Bacterial Agents)
      0 (Streptolysins)
      4W030VS2OG (ethylhydrocupreine)
      0 (Bacterial Proteins)
      A7V27PHC7A (Quinine)
    • Publication Date:
      Date Created: 20240913 Date Completed: 20241004 Latest Revision: 20241012
    • Publication Date:
      20241012
    • Accession Number:
      PMC11465973
    • Accession Number:
      10.1128/spectrum.01354-24
    • Accession Number:
      39269180