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Updated: Aug 19, 2026
Polymerase Chain Reaction and Dot-Blot Hybridization for Leptospira Detection in Water Samples
Published on: June 14, 2024
Polymerase chain reaction assay specific for pathogenic Leptospira based on the gene hap1 encoding the
Christine Branger1, Béatrice Blanchard, Catherine Fillonneau
1Leptospira Medical and Molecular Bacteriology Unit, ENVN, BP 40706, 44307 Nantes Cedex 03, France.
Abstract:
In this study, we used Southern hybridization of genomic DNA with the integral hap1 gene as a probe to show that this gene is only present in pathogenic Leptospira strains. We then selected PCR primers based on the hap1 gene, and tested them on several Leptospira strains and biological samples. Specific amplification was obtained for all pathogenic strains tested. Negative PCR results were observed with all saprophytic leptospire strains used as well as with other spirochetes and bacteria commonly found in biological samples. The results of direct PCR performed on biological samples, such as blood, urine or kidneys correlated with the results obtained with the classical Leptospira tests (culture and MAT). A PCR assay based on this gene would be a very useful tool for the rapid, sensitive and specific identification of pathogenic leptospires in samples for diagnosis or epidemiological survey.
Insights
A new PCR test using the hap1 gene accurately identifies pathogenic Leptospira bacteria. This rapid and specific diagnostic tool aids in identifying Leptospira infections in various biological samples.
Area of Science:
- Microbiology
- Molecular Biology
- Infectious Diseases
Background:
- Leptospira are pathogenic bacteria causing leptospirosis.
- Accurate and rapid diagnostic methods are crucial for controlling leptospirosis.
Purpose of the Study:
- To develop a specific and sensitive Polymerase Chain Reaction (PCR) assay for identifying pathogenic Leptospira strains.
- To evaluate the efficacy of the PCR assay in biological samples.
Main Methods:
- Southern hybridization using the integral hap1 gene as a probe to determine its presence in Leptospira strains.
- Development of PCR primers based on the hap1 gene.
- Testing the PCR assay on various Leptospira strains (pathogenic and saprophytic), other bacteria, and biological samples (blood, urine, kidneys).
Main Results:
- The hap1 gene was exclusively found in pathogenic Leptospira strains.
- The developed PCR assay showed specific amplification for all pathogenic Leptospira strains tested.
- No amplification was observed with saprophytic Leptospira strains or other common bacteria.
- PCR results from biological samples correlated well with traditional diagnostic methods (culture and MAT).
Conclusions:
- The hap1 gene is a reliable marker for identifying pathogenic Leptospira.
- A PCR assay based on the hap1 gene provides a rapid, sensitive, and specific method for diagnosing leptospirosis.
- This PCR assay is a valuable tool for clinical diagnosis and epidemiological surveillance of leptospirosis.
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