Abstract
Loop-mediated isothermal amplification (LAMP) is a highly sensitive, rapid, cost-effective nucleic acid amplification method. Tuberculosis (TB) is widely popular in the world and it is difficult to cure. The fundamental treatment is to clear the types of TB pathogens such as Mycobacterium bovis (M. bovis), Mycobacterium tuberculosis (M. tuberculosis). In order to detect and diagnose TB early, we constructed the differential diagnostic method of TB. In this study, we used LAMP for detection of M. bovis, based on amplification of the mpb70 gene which is a unique gene in M. bovis strain. The LAMP assay was able to detect only seven copies of the gene per reaction, whereas for the conventional PCR, it was 70 copies. The LAMP was evaluated for its specificity using six strains of five Mycobacterium species and 18 related non-Mycobacterium microorganism strains as controls. The target three Mycobacterium strains were all amplified, and no cross-reaction was found with 18 non-Mycobacterium microorganism strains. TB was detected by two methods, LAMP and conventional PCR (based on mpb70 gene); the positive rates of the two methods were 9.55 and 7.01 %, respectively. Our results indicate that the LAMP method should be a potential tool with high convenience, rapidity, sensitivity and specificity for the diagnosis of TB caused by M. bovis. Most importance is that the use of LAMP as diagnostic method in association with diagnostic tests based on mpb70 gene would allow the differentiation between M. bovis and other Mycobacterium in humans or animals. The LAMP method is actually in order to detect human TB, and it can be used for differential diagnosis in this paper.
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Acknowledgments
This work was supported by Grants from the International Science and Technology Cooperation Project of China (2015DFR31110 and 2013DFA32380), the National Natural Science Foundation of China (31460650, 31360610, 31572491), and the University Key Research Project of Henan Province (16A230013).
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Communicated by Michael Berney.
Hui Zhang and Zhen Wang have contributed equally to this work.
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Zhang, H., Wang, Z., Cao, X. et al. Loop-mediated isothermal amplification assay targeting the mpb70 gene for rapid differential detection of Mycobacterium bovis . Arch Microbiol 198, 905–911 (2016). https://doi.org/10.1007/s00203-016-1232-6
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DOI: https://doi.org/10.1007/s00203-016-1232-6