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Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species
09:34

Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species

Published on: November 8, 2016

On the origin and function of an insertion element VPaI-1 specific to post-1995 pandemic Vibrio parahaemolyticus

Tasuku Nishioka1, Muhammad Kamruzzaman, Mitsuaki Nishibuchi

  • 1Department of Biosystems Science, The Graduate University for Advanced Studies (Sokendai), Hayama, Kanagawa, Japan.

Genes & Genetic Systems
|May 29, 2008
PubMed

Insights

Pandemic Vibrio parahaemolyticus strains possess unique genomic islands (GIs). Researchers identified two genes within the VPaI-1 GI that may contribute to temperature adaptation and virulence, explaining their global spread.

Area of Science:

  • Microbiology
  • Genomics
  • Evolutionary Biology

Background:

  • Emergence of virulent Vibrio parahaemolyticus strains since 1995.
  • Four strain-specific genomic islands (GIs) are associated with pandemicity.
  • VPaI-1 is one of the GIs investigated for its role in virulence.

Purpose of the Study:

  • Investigate the origin and function of 24 genes within the VPaI-1 genomic island.
  • Identify potential factors contributing to the pandemicity and global spread of Vibrio parahaemolyticus.
  • Explore the evolutionary history and functional significance of specific genes.

Main Methods:

  • Comparative genomics: Searched for homologous genes in diverse bacterial and archaeal species.
  • Synteny analysis: Examined the conservation of genomic regions across different species.
  • Functional prediction: Hypothesized gene functions based on homology and known gene roles.

Main Results:

  • Two genes within VPaI-1 were found exclusively in Vibrio parahaemolyticus, Vibrio vulnificus, and Shewanella sp.
  • A conserved 8kb genomic segment containing these two genes suggests shared evolutionary history.
  • Identified potential temperature stress adaptation genes and a candidate swarming gene linked to virulence.

Conclusions:

  • The VPaI-1 genomic island contains genes potentially involved in Vibrio parahaemolyticus pandemicity.
  • These genes may confer advantages such as temperature tolerance and enhanced motility, facilitating global spread.
  • Understanding these genetic factors is crucial for predicting and controlling the emergence of virulent bacterial strains.

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