Development of a rapid detection method for Photobacterium spp. using Loop-mediated isothermal amplification (LAMP)

Area of Science:

• Food Microbiology
• Molecular Diagnostics
• Food Safety

Background:

• Photobacteria, once solely linked to marine environments, are now recognized as common contaminants in packaged meats.
• Their presence poses a challenge for the food industry regarding detection, entry routes, and growth prevention.

Purpose of the Study:

• To develop a sensitive and specific loop-mediated isothermal amplification (LAMP) assay for detecting relevant photobacteria species in food products, particularly meats.

Main Methods:

• A loop-mediated isothermal amplification (LAMP) assay was developed targeting the trimethylamine-N-oxide reductase (torA) gene in photobacteria.
• Primer specificity was confirmed against 67 photobacteria isolates and 63 other meat-spoiling bacteria strains.
• The assay's performance was validated on naturally and artificially contaminated chicken, beef, and pork samples, compared against culture-dependent methods.

Main Results:

• The optimized LAMP assay demonstrated high sensitivity (10-11 copies) and specificity, with results available within 2 hours.
• It successfully detected photobacteria in naturally contaminated chicken samples 3 days earlier than traditional culture-based methods.
• The assay proved effective on various meat types (chicken, beef, pork) and showed potential for application in fish and seafood.

Conclusions:

• The developed LAMP assay is a reliable, rapid, and sensitive tool for detecting photobacteria in meats.
• Its ease of implementation and lack of specialized equipment requirements facilitate integration into food industry quality control.
• This method aids in identifying contaminated batches, understanding contamination sources, and improving overall food safety protocols.