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Multi-locus Variable-number Tandem-repeat Analysis of the Fish-pathogenic Bacterium Yersinia ruckeri by Multiplex PCR and Capillary Electrophoresis
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Yersinia nurmii sp. nov.

Anna Murros-Kontiainen1, Maria Fredriksson-Ahomaa1, Hannu Korkeala1

  • 1Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Finland.

International Journal of Systematic and Evolutionary Microbiology
|November 2, 2010
PubMed
Summary

Three novel Gram-negative bacterial strains from modified atmosphere packaged broiler meat were identified as a new species, Yersinia nurmii. This finding expands the Yersinia genus and impacts food safety research.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Food Science

Background:

  • Gram-negative, rod-shaped bacteria are frequently isolated from food products.
  • Modified atmosphere packaging (MAP) is a common food preservation technique.
  • Accurate bacterial identification is crucial for food safety and understanding microbial ecology.

Purpose of the Study:

  • To identify and characterize three Gram-negative, rod-shaped bacterial strains isolated from broiler meat packaged under modified atmosphere.
  • To determine the phylogenetic and phenotypic properties of these novel strains.
  • To establish if these strains represent a new species within the Yersinia genus.

Main Methods:

  • Polyphasic taxonomic approach utilizing multilocus sequence analysis (MLSA) of five genes (16S rRNA, glnA, gyrB, recA, HSP60).
  • DNA-DNA reassociation assays with closely related phylogenetic neighbors.
  • Determination of key phenotypic characteristics.
  • Phylogenetic tree construction based on sequence data.

Main Results:

  • Phylogenetic analyses placed the strains within the genus Yersinia, forming a distinct monophyletic group.
  • The strains exhibited a unique phenotypic profile, most closely resembling Yersinia ruckeri.
  • No typical virulence markers associated with pathogenic Yersinia species were detected.
  • DNA-DNA reassociation data supported the classification as a novel species.

Conclusions:

  • The isolated strains represent a novel species, proposed as Yersinia nurmii sp. nov.
  • This discovery contributes to the taxonomic understanding of the Yersinia genus.
  • The identification of Y. nurmii in broiler meat has implications for food microbiology and safety assessments.