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Classification of fish-pathogenic vibrios based on comparative 16S rRNA analysis

R Wiik1, E Stackebrandt, O Valle

  • 1Department of Microbiology and Plant Physiology, University of Bergen, Norway.

International Journal of Systematic Bacteriology
|July 1, 1995
PubMed
Summary

This study used 16S rRNA gene sequencing to classify fish-pathogenic Vibrio species. The analysis confirmed Vibrio anguillarum strains are closely related and distinguished Vibrio salmonicida as a distinct species.

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Area of Science:

  • Microbiology
  • Aquatic Animal Health
  • Molecular Biology

Background:

  • Systematic classification of fish-pathogenic Vibrio species remains challenging despite various existing methods.
  • Previous classification systems (serological, physiological, genetical) have not provided a comprehensive framework for these bacteria.

Purpose of the Study:

  • To perform a comparative 16S rRNA analysis of 34 fish-pathogenic Vibrio strains representing seven species.
  • To establish a robust phylogenetic classification for fish-pathogenic Vibrio species based on 16S rRNA gene sequences.

Main Methods:

  • Comparative analysis of 16S rRNA gene sequences from 34 Vibrio strains.
  • Sequencing utilized reverse transcriptase, with nearly complete sequences obtained for nine strains and analysis of 560 nucleotides for others.

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Main Results:

  • Phylogenetic analysis confirmed close relationships among most Vibrio anguillarum strains, with distinct groupings observed.
  • Vibrio salmonicida was confirmed as a distinct species, with some strains showing phenotypic variations but clear phylogenetic ties.
  • Vibrio ordalii and Vibrio damsela showed high similarity to a distinct V. anguillarum group (type strain NCMB 6).
  • Vibrio salmonicida and Vibrio fischeri formed a distinct phylogenetic cluster, separate from the V. anguillarum cluster.

Conclusions:

  • 16S rRNA gene sequencing provides a reliable method for classifying fish-pathogenic Vibrio species.
  • The phylogenetic data support the distinct species status of V. salmonicida and highlight its relationship with V. fischeri.
  • This classification refines our understanding of Vibrio taxonomy in fish, aiding in disease diagnosis and management.