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Rapid and Highly Sensitive Detection of Toxigenic Vibrio cholerae Based on Recombinase-Aided Amplification Combining with Lateral Flow Assay

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Abstract

Vibrio cholerae is an important food-borne pathogenic bacterium that causes human disease, resulting in economic losses worldwide. Rapid diagnosis of cholera infection is important to avoid potential spread of disease. In this study, recombinase-aided amplification (RAA) primers labeled with biotin and fluorescein isothiocyanate (FITC) at 5′ end were prepared for the ctxA pathogenic gene of V. cholerae. RAA amplicons obtained at 37 °C isothermal conditions for 15 min were firstly preincubated with the antibody against FITC, subsequently with streptavidin-modified superparamagnetic nanoparticles (SA-SPMNPs), to form a DNA amplicons-FITC antibody-SA-SPMNPs complex. The complex could be captured by the secondary antibody on test line of lateral flow test strip (LFTS), and the residual streptavidin on SA-SMMNPs could be captured by the biotin-BSA on the control line of LFTS. Thus, a sensitive quantitative detection was achieved by the magnetic signal of test line of LFTS through a magnetic assay instrument. The RAA amplicons from various bacteria (n = 25) obtained by a thermostatic water bath for 15 min at 37 °C were used as samples of lateral flow assay (LFA). No positive reaction was observed besides of pathogenic V. cholerae. A total of 100 CFU/ml V. cholerae in shrimp samples could be detected by a simple naked eye observation within 50 min including the sample pretreatment. Quantitative LOD 46 CFU/ml V. cholerae in shrimp was achieved, which was more than 10 times lower than the current industry pathogenic range. The novel RAA-LFA shows a potential application in the point-of-care diagnosis or detection of V. cholerae.

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Funding

This work was supported by the National Science and Technology Major Project of China (No. 2018ZX10101003), the State Key Laboratory of Pathogen and Biosecurity (Academy of Military Medical Science) (No. SKLPBS1832).

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Correspondence to Hengliang Wang or Ying Lu.

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Weiwei Fang declares that she has no conflict of interest. Yangyang Cai declares that he has no conflict of interest. Li Zhu declares that he has no conflict of interest. Hengliang Wang declares that he has no conflict of interest. Ying Lu declares that she has no conflict of interest.

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Fang, W., Cai, Y., Zhu, L. et al. Rapid and Highly Sensitive Detection of Toxigenic Vibrio cholerae Based on Recombinase-Aided Amplification Combining with Lateral Flow Assay. Food Anal. Methods 14, 687–696 (2021). https://doi.org/10.1007/s12161-020-01909-x

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  • DOI: https://doi.org/10.1007/s12161-020-01909-x

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