Abstract
We established and validated an improved loop-mediated isothermal amplification (LAMP) method combined with a TaqMan probe (LAMp-Taqman method) for detection of Mycoplasma gallinis (MG). A test plasmid was constructed using a conserved sequence of the specific gene vlhA of MG, and the LAMP primer set was screened according to the conservative gene design. The loop primer modified by fluorescent/quenching dyes was used as the TaqMan probe to establish the LAMP-TaqMan detection method. The feasibility and application value of LAMP in detecting MG nucleic acids were evaluated by parallel testing using real-time fluorescence quantitative qPCR as a control. The study results showed that LAMP-TaqMan had good specificity in detecting MG nucleic acids. The optimal detection temperature was 63 ºC, and the linear correlation coefficient R2 of eight tenfold serial dilutions (2.607 × 106 copies/µL–2.607 × 10−1 copies/µL) was 0.995; the minimum detection limit was 2.607–1 copies/µL, and the detection rate of the minimum detection limit was 100%. The high-, medium-, and low-concentration test plasmids were tested for repeatability (the coefficients of variation (CVs) were 0.202%, 1.770%, and 3.771%, respectively). Parallel tests were conducted on 120 samples collected from pairs of chickens, the accuracy, sensitivity and specificity of TP-LAMP were 97.50%, 100.00% and 96.30%, respectively. The detection time is 1 h, in fact, test results can be obtained in 45 min. The LAMP-TaqMan isothermal nucleic acid detection method not only maintains the effect of the loop primer to accelerate amplification but also offers fast and simple detection, a low detection limit, and a low rate of false positives; it has a broad market application prospect in the accurate and rapid detection of poultry diseases.
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The datasets generated during the current study are available from the corresponding author upon reasonable request.
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The work described in this paper was fully supported by a grant from the High-level Science and Technology Innovation and Entrepreneurship Talent Project of Shijiazhuang (No. 05202001).
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YL developed the TaqMan-LAMP method and prepared the original draft; YZ and MW treated the samples; ZD, LY and LS edited the manuscript; and GS acquired funding. All the authors have read and agreed to the published version of the manuscript.
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Liu, Y., Zhang, Y., Wang, M. et al. Modified loop-mediated isothermal amplification method combined with a TaqMan probe for the detection of Mycoplasma gallisepticum. Eur Food Res Technol 249, 1469–1477 (2023). https://doi.org/10.1007/s00217-023-04226-9
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DOI: https://doi.org/10.1007/s00217-023-04226-9