An improved detection and quantification method for the coral pathogen Vibrio coralliilyticus.

Area of Science:

• Marine microbiology
• Molecular diagnostics
• Coral reef ecology

Background:

• Vibrio coralliilyticus is a significant marine pathogen impacting coral health.
• Accurate and rapid diagnostic tools are crucial for managing coral diseases.

Purpose of the Study:

• To develop and validate DNA- and RNA-based PCR assays for detecting Vibrio coralliilyticus.
• To assess the specificity and sensitivity of these assays for diagnostic and monitoring purposes.

Main Methods:

• Development of DNA- and RNA-based PCR and reverse-transcription real-time PCR assays targeting the vcpA gene.
• Testing assays against various Vibrio species, including global V. coralliilyticus isolates and misidentified strains.
• Evaluating the sensitivity, linearity, and robustness of the real-time PCR assay.

Main Results:

• Both PCR assays demonstrated high specificity for V. coralliilyticus, distinguishing it from related Vibrio species.
• The assays successfully identified all tested V. coralliilyticus isolates, including a new Mediterranean strain, and flagged potentially misidentified V. tubiashii.
• The real-time assay exhibited high sensitivity (10 gene copies), excellent linearity (R(2)≥99.7), and was unaffected by non-target DNA.

Conclusions:

• Developed PCR and real-time PCR assays provide rapid and specific detection of Vibrio coralliilyticus.
• These tools are valuable for monitoring coral reef health, managing disease outbreaks, and advancing research on V. coralliilyticus pathogenesis.