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Guo M, Feng P, Zhang L, Feng C, Fu J, Pu X, Liu F. Rapid Detection of Clostridium tetani by Recombinase Polymerase Amplification Using an Exo Probe. J Microbiol Biotechnol 2022; 32:91-98. [PMID: 34818665 PMCID: PMC9628835 DOI: 10.4014/jmb.2109.09022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 12/15/2022]
Abstract
Tetanus is a potentially fatal public health illness resulted from the neurotoxins generated by Clostridium tetani. C. tetani is not easily culturable and culturing the relevant bacteria from infected wounds has rarely been useful in diagnosis; PCR-based assays can only be conducted at highly sophisticated laboratories. Therefore, a real-time recombinase polymerase amplification assay (Exo-RPA) was constructed to identify the fragments of the neurotoxin gene of C. tetani. Primers and the exo probe targeting the conserved region were designed, and the resulting amplicons could be detected in less than 20 min, with a detection limit of 20 copies/reaction. The RPA assay displayed good selectivity, and there were no cross-reactions with other infectious bacteria common in penetrating wounds. Tests of target-spiked serum and pus extract revealed that RPA is robust to interfering factors and has great potential for further development for biological sample analysis. This method has been confirmed to be reliable for discriminating between toxic and nontoxic C. tetani strains. The RPA assay dramatically improves the diagnostic efficacy with simplified device architecture and is a promising alternative to real-time PCR for tetanus detection.
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Affiliation(s)
- Mingjing Guo
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China
| | - Pan Feng
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China
| | - Liqun Zhang
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China
| | - Chunfeng Feng
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China
| | - Jie Fu
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China
| | - Xiaoyun Pu
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China,
X. Pu Phone: +86-23-68755637 E-mail:
| | - Fei Liu
- Department of clinical laboratory, Xinqiao Hospital and The Second Affiliated Hospital, Army Medical University, No. 183 Xinqiao Main St, Shapingba District, Chongqing 400037, P.R. China,Corresponding authors F. Liu E-mail:
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