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Updated: May 10, 2026
08:51
Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
Published on: November 4, 2016
Streptococcus rubneri sp. nov., isolated from the human throat
Melanie Huch1, Katrien De Bruyne2, Ilse Cleenwerck3
1Max Rubner-Institut, Federal Research Institute for Nutrition and Food, Department of Safety and Quality of Fruit and Vegetables, Haid-und-Neu-Straße 9, 76131 Karlsruhe, Germany.
Summary
Researchers discovered a new bacterial species, Streptococcus rubneri, from human throat samples. This Gram-positive lactic acid bacterium is distinct from other known Streptococcus species.
Area of Science:
- Microbiology
- Bacteriology
- Genomics
Background:
- Human throat microbiota harbors diverse bacterial species.
- The Streptococcus genus includes many clinically relevant bacteria.
- Accurate bacterial classification is crucial for understanding host-microbe interactions.
Purpose of the Study:
- To identify and characterize novel bacterial isolates from human throat samples.
- To determine the taxonomic position of these isolates within the Streptococcus genus.
- To propose a new species designation if the isolates represent a distinct taxon.
Main Methods:
- 16S rRNA gene sequencing for initial phylogenetic analysis.
- Genotypic fingerprinting techniques including fluorescent amplified fragment length polymorphism (FAFLP) and pulsed-field gel electrophoresis (PFGE).
- DNA-DNA hybridizations, comparative sequence analysis of housekeeping genes (pheS, rpoA, atpA), and comprehensive physiological and biochemical testing.
Main Results:
- Isolates LMG 27205, LMG 27206, LMG 27207(T), and MRI-F 18 were identified as Gram-positive, ovoid lactic acid bacteria.
- Phylogenetic analysis based on 16S rRNA gene sequences placed the isolates within the Streptococcus mitis group, with S. australis and S. mitis as closest relatives.
- Multiple genotypic, genetic, and phenotypic analyses confirmed that these isolates constitute a distinct taxon, well-separated from recognized Streptococcus species.
Conclusions:
- The novel isolates represent a new species within the Streptococcus genus.
- The proposed name for this new species is Streptococcus rubneri sp. nov.
- Strain LMG 27207(T) (= DSM 26920(T)) is designated as the type strain for Streptococcus rubneri.
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