Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (6): 1419-1428.doi: 10.11843/j.issn.0366-6964.2020.025

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Rapid and Sensitive Diagnosis of Mycoplasma hyopneumoniae by Loop-mediated Isothermal Amplification Combined with a Lateral Flow Dipstick

SUN Panpan1,2, SHI Jianli2, PENG Zhe2, WANG Shuo3, WANG Yan1, WU Xiaoyan2,3, XU Shaojian2, LI Jun1,2,3*   

  1. 1. Qingdao Agricultural University, Qingdao 266000, China;
    2. Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan 250100, China;
    3. Shandong Normal University, Jinan 250014, China
  • Received:2019-12-09 Online:2020-06-25 Published:2020-06-23

Abstract: The purpose of this study was to establish a rapid, specific and visual assay for the detection of Mycoplasma hyopneumoniae (Mhp) by the combination of the loop-mediated isothermal amplification (LAMP) method and lateral flow dipstick (LFD) system. Five sets of specific primers and one FITC labeled probe targeting to P36 gene of Mhp were designed for LAMP. Biotinylated LAMP amplicons were hybridized exclusively with the FITC-labeled probe and the amplification product was detected by LFD assay. After optimization, the optimal reaction condition of LAMP is 65℃, reaction time is 15 minutes. It only takes about 40 minutes from the extraction of genomic DNA to the visualization of the amplicons by LFD, which is nearly 2 hours shorter than that of conventional PCR. Mhp could be accurately detected by LAMP-LFD. LAMP-LFD can specifically detect Mhp, and the detection results of common pathogens of swine diseases such as Mycoplasma hyorhinis and porcine circovirus are negative. Sensitivity test showed that the sensitivity of LAMP-LFD to Mhp was approximately 1×100 copies of DNA, which was 1 000 times higher than that of standard PCR. Using this method, 64 Mhp positive samples were detected from 88 clinical suspected samples, 56 positive samples were detected by parallel detection of national standard PCR method, and the coincidence rate was 90.9%. The results showed that the LAMP-LFD assay can be used in the detection of Mhp specifically and accurately, and it has advantages of high sensitivity, simple operation, low dependence of instruments and equipment, low detection cost and short time-consuming. It is suitable for the use of basic laboratory, emergency detection or on-site monitoring. It has high promotion value and is expected to develop into a rapid, easy-to-operate tool for detection of Mhp.

Key words: Mycoplasma hyopneumoniae, loop-mediated isothermal amplification combined, lateral flow dipstick, diagnosis

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