Leptospirosis is a waterborne zoonotic disease caused by pathogenic species of the genus Leptospira that affects humans and animals. Current diagnostic methods, such as culture and serology-based techniques, have limitations, including low sensitivity and time-consuming nature. This study presents the first implementation of the polymerase spiral reaction (PSR) assay for the rapid and visual detection of Leptospira interrogans. The assay utilizes Lipl32, a highly conserved gene that encodes an outer membrane lipoprotein, as a marker gene to detect pathogenic Leptospira spp. For visual detection, the assay was evaluated using a colorimetric dye and nucleic acid stain. The assay was optimized for various reaction parameters. The optimal conditions were determined to be 60°C for 60 min with 6U of Bst Polymerase, 5 mM of Mg2+, 2.5 mM of Betaine, and 10 mM of dNTPs. An artificial contamination study in tap water established the assay’s detection limit at 16 GEq/mL. Notably, the PSR assay showed high specificity and sensitivity compared to loop-mediated isothermal amplification (LAMP), requiring only a single primer pair in contrast to the six primers required for LAMP.
Vishwakarma A, Chowdary P, Ramya M. Rapid and visual detection of leptospira interrogans using polymerase spiral reaction assay. J App Biol Biotech. 2023;11(Suppl 1):46-51. http://doi.org/10.7324/JABB.2023.144426
1. Harada Y, Hayashi M. Severe leptospirosis in a patient with positive serological test for spotted fever rickettsiosis. BMJ Case Rep 2019;12:bcr-2018-226514. https://doi.org/10.1136/bcr-2018-226514 | |
2. Le Turnier P, Bonifay T, Mosnier E, Schaub R, Jolivet A, Demar M, et al. Usefulness of C-reactive protein in differentiating acute leptospirosis and dengue fever in French Guiana. Open Forum Infect Dis 2019;6:ofz323. https://doi.org/10.1093/ofid/ofz323 | |
3. Nhan TX, Bonnieux E, Rovery C, De Pina JJ, Musso D. Fatal leptospirosis and chikungunya co-infection: Do not forget leptospirosis during chikungunya outbreaks. IDCases 2016;5:12-4. https://doi.org/10.1016/j.idcr.2016.06.003 | |
4. Gurumurthy K, Narasimha HB, Wyawahare M, Biswal N. Leptospirosis: A diagnostic conundrum. Trop Doct 2018;48:306-9. https://doi.org/10.1177/0049475518788470 | |
5. Goris MG, Hartskeerl RA. Leptospirosis serodiagnosis by the microscopic agglutination test. Curr Protoc Microbiol 2014;32:Unit 12E.5. https://doi.org/10.1002/9780471729259.mc12e05s32 | |
6. Budihal SV, Perwez K. Leptospirosis diagnosis: Competancy of various laboratory tests. J Clin Diagn Res 2014;8:199-202. https://doi.org/10.7860/JCDR/2014/6593.3950 | |
7. Pinto GV, Senthilkumar K, Rai P, Kabekkodu SP, Karunasagar I, Kumar BK. Current methods for the diagnosis of leptospirosis: Issues and challenges. J Microbiol Methods 2022;195:106438. https://doi.org/10.1016/j.mimet.2022.106438 | |
8. Philip N, Affendy NB, Masri SN, Yuhana MY, Than LT, Sekawi Z, et al. Combined PCR and MAT improves the early diagnosis of the biphasic illness leptospirosis. PLoS One 2020;15:e0239069. https://doi.org/10.1371/journal.pone.0239069 | |
9. Ahmed A, van der Linden H, Hartskeerl RA. Development of a recombinase polymerase amplification assay for the detection of pathogenic Leptospira. Int J Environ Res Public Health 2014;11:4953-64. https://doi.org/10.3390/ijerph110504953 | |
10. Li C, Shi Y, Yang G, Xia XS, Mao X, Fang Y, et al. Establishment of loop-mediated isothermal amplification for rapid detection of Pseudomonas aeruginosa. Exp Ther Med 2019;17:131-6. https://doi.org/10.3892/etm.2018.6910 | |
11. Liu W, Dong D, Yang Z, Zou D, Chen Z, Yuan J, et al. Polymerase spiral reaction (PSR): A novel isothermal nucleic acid amplification method. Sci Rep 2015;5:12723. https://doi.org/10.1038/srep12723 | |
12. Hsu YH, Chou SJ, Chang CC, Pan MJ, Yang WC, Lin CF, et al. Development and validation of a new loop-mediated isothermal amplification for detection of pathogenic Leptospira species in clinical materials. J Microbiol Methods 2017;141:55-9. https://doi.org/10.1016/j.mimet.2017.07.010 | |
13. Motohashi K. Development of highly sensitive and low-cost DNA agarose gel electrophoresis detection systems, and evaluation of non-mutagenic and loading dye-type DNA-staining reagents. PLoS One 2019;14:e0222209. https://doi.org/10.1371/journal.pone.0222209 | |
14. Kwong KM, Tam CC, Chan R, Lee SW, Ip P, Kwok J. Comparison of single nucleotide polymorphism genotyping of CYP2C19 by loop-mediated isothermal amplification and real-time PCR melting curve analysis. Clin Chim Acta 2018;478:45-50. https://doi.org/10.1016/j.cca.2017.12.013 | |
15. Tubalinal GA, Balbin MM, Villanueva MA, Domingo CY, Mingala CN. Evaluation of LAMP for detection and/or screening of Leptospira spp. Infection among domestic animals in the Philippines. J Adv Vet Anim Res 2018;5:459-65. https://doi.org/10.5455/javar.2018.e299 | |
16. Monica NI, Rathinasabapathi P, Ramya M. Development of real-time loop-mediated isothermal amplification (RealAmp) method for sensitive and rapid detection of pathogenic and nonpathogenic Leptospira. Lett Appl Microbiol 2019;68:196-203. https://doi.org/10.1111/lam.13108 | |
17. Rashwan N, Diawara A, Scott ME, Prichard RK. Isothermal diagnostic assays for the detection of soil-transmitted helminths based on the SmartAmp2 method. Parasit Vectors 2017;10:496. https://doi.org/10.1186/s13071-017-2420-1 |
Year
Month