Discriminating bovine mastitis pathogens by combining loop-mediated isothermal amplification and amplicon-binding...

Area of Science:

• Veterinary Microbiology
• Molecular Diagnostics
• Biosensor Technology

Background:

• Bovine mastitis, a major dairy industry concern, is caused by diverse bacterial pathogens.
• Accurate and rapid pathogen identification is crucial for effective treatment and combating antimicrobial resistance.

Purpose of the Study:

• To develop a novel diagnostic method for detecting mastitis pathogens in milk samples.
• To combine loop-mediated isothermal amplification (LAMP) with a split enzyme biosensor for enhanced pathogen detection.

Main Methods:

• Development of three primer sets (LAMPstaph, LAMPstrep, LAMPneg) targeting Staphylococcus, Streptococcus, and Gram-negative bacteria.
• Fusion of trehalase fragments with a DNA-binding protein (SpoIIID) for biosensor functionality.
• Determination of detection limits using bacterial DNA and spiked milk samples.

Main Results:

• The method detected low copies of genomic DNA for staphylococci, streptococci, and E. coli.
• Detection limits varied, with higher limits for Gram-positive bacteria in spiked milk.
• Minimal cross-reactivity observed, with LAMPneg showing slight cross-reactivity with Corynebacterium sp.

Conclusions:

• The combined LAMP and biosensor method shows potential for rapid differentiation of mastitis pathogen Gram types.
• This diagnostic approach can guide antimicrobial treatment decisions without the need for bacterial culturing.
• The technology aids in preventing antimicrobial resistance through timely and accurate diagnosis.