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Listeria goaensis sp. nov.

Swapnil P Doijad1, Krupali V Poharkar2, Satyajit B Kale2

  • 11​Institute for Medical Microbiology, Justus-Liebig University, and German Center for Infection Research (DZIF), Partner Site Gießen-Marburg-Langen, Campus Gießen, Germany.

International Journal of Systematic and Evolutionary Microbiology
|August 30, 2018
PubMed
Summary

Researchers discovered two novel Listeria species, Listeriagoaensis sp. nov., from Indian mangrove swamps. These bacteria, identified through polyphasic characterization, represent a new addition to the Listeria genus.

Keywords:
GoaL. goaensisListeriahaemolysisnew taxa

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Area of Science:

  • Microbiology
  • Bacteriology
  • Genomics

Background:

  • The genus Listeria encompasses several species, some of which are significant human and animal pathogens.
  • Exploration of diverse environments, such as mangrove swamps, can lead to the discovery of novel microbial diversity.
  • Accurate taxonomic classification of bacterial isolates is crucial for understanding their ecological roles and potential impacts.

Purpose of the Study:

  • To characterize two Listeria-like isolates from Indian mangrove swamps using a polyphasic approach.
  • To determine the taxonomic status of these isolates within the genus Listeria.
  • To propose a new species designation for the novel isolates.

Main Methods:

  • Polyphasic characterization including phenotypic, chemotaxonomic, and whole-genome sequencing (WGS) analyses.
  • 16S rRNA gene sequencing for phylogenetic analysis.
  • Analysis of core coding DNA sequences, average nucleotide identity (ANI), and in silico DNA-DNA hybridization (dDDH).

Main Results:

  • The isolates were Gram-positive rods, non-motile, oxidase-negative, catalase-positive, and exhibited alpha-haemolysis.
  • 16S rRNA gene sequence identity (93.7-99.7%) confirmed their membership in the genus Listeria.
  • WGS-based ANI and in silico dDDH values were below the thresholds for species delineation, indicating novelty.
  • Phylogenetic analysis placed the isolates as a distinct monophyletic clade within Listeria.

Conclusions:

  • The two isolates represent a novel species within the genus Listeria.
  • The proposed name for the new species is Listeriagoaensis sp. nov.
  • The type strain is designated as ILCC801T (=KCTC 33909;=DSM 29886;=MCC 3285).