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Detection of urovirulence factors in Escherichia coli by multiplex polymerase chain reaction
1Department of Urology, Faculty of Medicine, Kyoto University, Japan.
Abstract:
Primers to amplify the genes encoding the virulence factors of uropathogenic Escherichia coli, such as pilus associated with pyelonephritis (pap), haemolysin (hly), aerobactin (aer) and cytotoxic necrotizing factor 1 (cnf1) genes, were designed. The above primers along with previously reported primers for S fimbriae (sfa) and afimbrial adhesin I (afaI) genes were combined to develop a multiplex polymerase chain reaction (PCR) for detection of the respective virulence factors and for the identification of uropathogenic E. coli. The multiplex PCR to detect pap, sfa, afaI, hly, aer and cnf1 genes was highly specific and the sensitivity was found to be about 5 x 10(3) colony forming units of E. coli per ml. A total of 194 E. coli strains isolated from patients with simple acute cystitis were examined by the multiplex PCR and the results were in complete agreement with that obtained by DNA colony hybridization test. The multiplex PCR developed was, therefore, concluded to be a useful, sensitive and rapid assay system to identify uropathogenic E. coli.
Insights
A new multiplex PCR assay effectively identifies uropathogenic Escherichia coli (UPEC) by detecting key virulence genes. This rapid and sensitive method aids in diagnosing urinary tract infections caused by UPEC strains.
Area of Science:
- Microbiology
- Molecular Biology
- Infectious Diseases
Background:
- Uropathogenic Escherichia coli (UPEC) is a major cause of urinary tract infections.
- Virulence factors like pap, hly, aer, cnf1, sfa, and afaI are crucial for UPEC pathogenesis.
- Accurate and rapid identification of UPEC strains is essential for effective treatment.
Purpose of the Study:
- To develop a multiplex PCR assay for simultaneous detection of UPEC virulence genes.
- To evaluate the sensitivity and specificity of the developed multiplex PCR.
- To assess the utility of the assay for identifying UPEC in clinical isolates.
Main Methods:
- Design of primers for virulence genes: pap, hly, aer, and cnf1.
- Combination of new primers with existing primers for sfa and afaI genes.
- Development and optimization of a multiplex PCR protocol.
- Testing the multiplex PCR on 194 E. coli strains from cystitis patients.
Main Results:
- The multiplex PCR successfully detected pap, sfa, afaI, hly, aer, and cnf1 genes.
- High specificity was observed for the multiplex PCR assay.
- Sensitivity was determined to be approximately 5 x 10^3 colony-forming units/mL.
- Results from multiplex PCR showed complete agreement with DNA colony hybridization.
Conclusions:
- The developed multiplex PCR is a highly specific and sensitive method for identifying UPEC.
- This assay provides a rapid and reliable tool for the detection of uropathogenic E. coli.
- The multiplex PCR system is valuable for clinical diagnostics and epidemiological studies of UTIs.