Real-time loop-mediated isothermal amplification assay for rapid and sensitive detection of anthrax spores in spiked soil and talcum powder |
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Authors: | Neha Jain Jyoti S Kumar M M Parida S Merwyn G P Rai G S Agarwal |
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Institution: | (1) Division of High Containment Facility, Defence Research & Development Establishment (DRDE), Jhansi Road, Gwalior, 474002, Madhya Pradesh, India;(2) Division of Virology, Defence Research & Development Establishment, Gwalior, 474002, India; |
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Abstract: | Loop-mediated isothermal amplification (LAMP) assay is a powerful and innovative gene amplification technique that specifically
amplifies the target gene under isothermal conditions with a high degree of sensitivity, rapidity and specificity. The major
advantage of the LAMP assay is monitoring of amplified products without the requirement of any sophisticated equipment. In
the present study a real time LAMP assay was employed for rapid and real time detection of Bacillus anthracis spores spiked in 0.1 g of soil and talcum powder ranging from 2 to 107 spores. DNA was isolated from spiked soil and talcum powder using PBS containing 1% Triton X-100, and heat treatment. Isolated
DNA was used as template for LAMP and PCR. LAMP amplification was obtained in 60 min under isothermal condition at 63°C by
employing a set of six primers targeting the pag gene of B. anthracis. The detection limit of LAMP assay in soil and talcum powder was found to be as low as 5 spores, compared to 103 spores and 104 spores by PCR in talcum powder and soil, respectively. The findings suggest that LAMP is a more rapid and sensitive assay
than PCR for detecting anthrax spores, additionally the methodology to prepare DNA from spiked samples is simple, rapid and
cost effective. |
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