Detection of clinically important β-lactamases by using PCR

Area of Science:

• Microbiology
• Molecular Biology
• Bioinformatics

Background:

• Antimicrobial resistance in nosocomial pathogens poses a significant public health threat.
• Detecting beta-lactamase-producing organisms is essential for controlling resistance spread.

Purpose of the Study:

• To design a Polymerase Chain Reaction (PCR) assay for the rapid detection of clinically relevant beta-lactamase genes.
• To target beta-lactamase genes found in Enterobacteriaceae and Gram-negative non-fermenting bacteria.

Main Methods:

• Designed 67 primer pairs for various beta-lactamase classes (A, B, C, D) and subclasses.
• Experimentally tested 43 primer pairs in vitro.
• Verified PCR product functionality using reference and clinical strains, confirmed by Sanger sequencing and bioinformatics analysis.

Main Results:

• Successfully designed primers identified all 29 tested beta-lactamase genes, including 10 oxacillinase subgroups.
• The assay demonstrated high specificity, detecting 99.7% of analyzed beta-lactamase subtypes.
• The primer set covers over 79.8% of all described beta-lactamase genes.

Conclusions:

• The developed PCR assay provides a rapid and accurate method for detecting beta-lactamase-producing bacteria.
• This tool is valuable for clinical settings to manage and control the spread of antimicrobial resistance.