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Detection of Nosema bombycis by FTA Cards and Loop-Mediated Isothermal Amplification (LAMP)

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Abstract

We successfully established a detection method which exhibited a markedly higher sensitivity than previously developed detection methods for Nosema bombycis by combining glass beads, FTA card, and LAMP. Spores of N. bombycis were first broken by acid-washed glass beads; the DNA was subsequently extracted and purified with the FTA card, and LAMP was performed using primers (LSU296) designed based on the sequence of the LSU rRNA of N. bombycis. The minimum detection concentration was 10 spores/mL. When this method was used to detect pebrine disease in silkworm egg, the detection rate for 500 silkworm eggs, in which only one egg was infected with N. bombycis, was 100 % under our optimized conditions. If the number of eggs in the sample increased to 800 or 1,000, the sample was divided into two equal portions, and the eggs were smashed with glass beads after the addition of 1 mL of TE buffer. The liquid in two tubes was later mixed and applied to the FTA card, and the detection rates were 100 %. Furthermore, the LAMP method established in our study could detect N. bombycis infection in silkworm 24 h earlier than microscopy.

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Acknowledgments

This work was supported by the earmarked fund for the China Agriculture Research System. We are grateful to all who provided the means for us to access the free software used in our study, as cited in this article. We thank all of our partners and lab members for their kind help and criticism.

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Correspondence to Zhongyuan Shen.

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Yan, W., Shen, Z., Tang, X. et al. Detection of Nosema bombycis by FTA Cards and Loop-Mediated Isothermal Amplification (LAMP). Curr Microbiol 69, 532–540 (2014). https://doi.org/10.1007/s00284-014-0619-3

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  • DOI: https://doi.org/10.1007/s00284-014-0619-3

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