Polymerase spiral reaction assay for rapid visual detection of Mycobacterium avium subsp. paratuberculosis in fecal samples
Abstract A rapid, sensitive, and specific visual detection assay for Mycobacterium avium subsp. paratuberculosis (MAP) was developed and optimized using a polymerase spiral reaction (PSR) method. A pair of primers was designed targeting MAP specific sequence of IS900 putative transposes (p43) gene,...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-12435-3 |
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| Summary: | Abstract A rapid, sensitive, and specific visual detection assay for Mycobacterium avium subsp. paratuberculosis (MAP) was developed and optimized using a polymerase spiral reaction (PSR) method. A pair of primers was designed targeting MAP specific sequence of IS900 putative transposes (p43) gene, and PSR results were assessed using agarose gel electrophoresis and colour change with SYBR Green-I dye. The assay was optimized using water bath and the optimum reaction time and temperature for MAP-PSR were 60 min and 64 °C, respectively. The sign of target amplification can be visualized by naked eyes as SYBR Green-I change its colour due to intercalation with amplified products. The developed assay demonstrated that the primers specifically detected MAP and showed no cross-reaction with other common Mycobacterium. The sensitivity of the PSR assay for MAP detection was 122 fg or ~ 23 copy number of the template. The MAP-PSR assay was also evaluated using 100 clinical samples, and a total 59 samples were found positive. When same samples were tested by conventional PCR, 50 samples were found positive, and all PCR positive clinical samples were found positive by MAP-PSR too. In conclusion the developed MAP–PSR assay is simple, rapid, specific, and sensitive, and thereby very suitable for application and promotion in the field and resource limited laboratories. |
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| ISSN: | 2045-2322 |