Novel multiplex-PCR test for Escherichia coli detection

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• Escherichia coli (E. coli) is a common bacterium found in human and animal environments, acting as both commensal and pathogenic.
• Pathogenic E. coli strains can cause significant clinical infections, including digestive, urinary, and respiratory diseases, posing risks particularly to newborns.

Purpose of the Study:

• To develop a rapid, cost-effective, and reliable method for identifying Escherichia coli (E. coli) species.
• To establish a multiplex polymerase chain reaction (PCR) assay for detecting E. coli using amplification of three specific genes: cydA, lacY, and ydiV.

Main Methods:

• Primer design based on sequences from 1,171 complete E. coli genomes from the NCBI database.
• In silico testing of the developed multiplex PCR assay against 47,370 Enterobacteriaceae genomes.
• Validation through wet laboratory analyses to confirm specificity, repeatability, reproducibility, and reliability.

Main Results:

• The multiplex PCR assay demonstrated high sensitivity (95.76%) and specificity (99.49%) in silico.
• Wet laboratory analyses confirmed the test's high specificity, repeatability, reproducibility, and reliability.
• The method is cost-effective and labor-efficient due to the detection of only three genes.

Conclusions:

• The developed multiplex PCR method provides a fast, cheap, and reliable means for identifying E. coli.
• This assay offers a valuable tool for laboratories needing quick and accurate detection of E. coli from environmental or clinical samples.
• The method's high accuracy, specificity, and sensitivity make it a competitive alternative to existing detection techniques.