Comparative evaluation of Vibrio delineation methodologies in post-genomic era

Area of Science:

• Microbiology
• Bacteriology
• Genomics
• Taxonomy

Background:

• Vibrio species are prevalent marine bacteria and significant pathogens impacting aquaculture and human health.
• Distinguishing Vibrio strains is challenging due to highly similar physiological and biochemical characteristics, hindering research.
• Accurate Vibrio classification is crucial for understanding their physiology, pathogenicity, genomics, epidemiology, and ecology.

Purpose of the Study:

• To comparatively evaluate multiple methods for delineating Vibrio strains.
• To assess the utility of bacterial prophages for Vibrio classification and identification.
• To provide insights for taxonomic identification in the post-genomic era.

Main Methods:

• Comparative analysis of 16S rRNA gene identity, average nucleotide identity (ANI), gene content similarity, and multilocus sequence analysis (MLSA).
• Evaluation of bacterial prophages for classifying and identifying Vibrio strains.
• Delineation of Vibrio strains using established and novel molecular approaches.

Main Results:

• Multilocus sequence analysis (MLSA) demonstrated superior performance in discriminating Vibrio species compared to other methods.
• 16S rRNA gene identity, ANI, and gene content similarity require cautious application for Vibrio delineation.
• Bacterial prophages exhibited high specificity at strain and species levels, indicating potential for microbial identification.

Conclusions:

• MLSA is the most effective method for differentiating Vibrio species.
• Bacterial prophages offer a promising avenue for precise microbial species, sub-species, and strain-level identification.
• This study offers valuable insights for the taxonomic classification of complex microbial groups.