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Rapid and Accurate Identification of Mycobacterium tuberculosis Complex and Common Non-Tuberculous Mycobacteria by Multiplex Real-Time PCR Targeting Different Housekeeping Genes

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Abstract

Rapid and accurate identification of mycobacteria isolates from primary culture is important due to timely and appropriate antibiotic therapy. Conventional methods for identification of Mycobacterium species based on biochemical tests needs several weeks and may remain inconclusive. In this study, a novel multiplex real-time PCR was developed for rapid identification of Mycobacterium genus, Mycobacterium tuberculosis complex (MTC) and the most common non-tuberculosis mycobacteria species including M. abscessus, M. fortuitum, M. avium complex, M. kansasii, and the M. gordonae in three reaction tubes but under same PCR condition. Genetic targets for primer designing included the 16S rDNA gene, the dnaJ gene, the gyrB gene and internal transcribed spacer (ITS). Multiplex real-time PCR was setup with reference Mycobacterium strains and was subsequently tested with 66 clinical isolates. Results of multiplex real-time PCR were analyzed with melting curves and melting temperature (T m) of Mycobacterium genus, MTC, and each of non-tuberculosis Mycobacterium species were determined. Multiplex real-time PCR results were compared with amplification and sequencing of 16S-23S rDNA ITS for identification of Mycobacterium species. Sensitivity and specificity of designed primers were each 100 % for MTC, M. abscessus, M. fortuitum, M. avium complex, M. kansasii, and M. gordonae. Sensitivity and specificity of designed primer for genus Mycobacterium was 96 and 100 %, respectively. According to the obtained results, we conclude that this multiplex real-time PCR with melting curve analysis and these novel primers can be used for rapid and accurate identification of genus Mycobacterium, MTC, and the most common non-tuberculosis Mycobacterium species.

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Acknowledgments

This assay was supported by Grant No. 390012 from Isfahan University of Medical Sciences.

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Authors and Affiliations

  1. Department of Microbiology, Faculty of Medicine, Isfahan University of Medical Sciences, Esfahān, Iran

    Bahram Nasr Esfahani, Hadi Rezaei Yazdi, Sharareh Moghim & Hajieh Ghasemian Safaei

  2. Department of Immunology, Faculty of Medicine, Isfahan University of Medical Sciences, Esfahān, Iran

    Hamid Zarkesh Esfahani

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  1. Bahram Nasr Esfahani
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  2. Hadi Rezaei Yazdi
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  3. Sharareh Moghim
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  4. Hajieh Ghasemian Safaei
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Correspondence to Hadi Rezaei Yazdi.

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Nasr Esfahani, B., Rezaei Yazdi, H., Moghim, S. et al. Rapid and Accurate Identification of Mycobacterium tuberculosis Complex and Common Non-Tuberculous Mycobacteria by Multiplex Real-Time PCR Targeting Different Housekeeping Genes. Curr Microbiol 65, 493–499 (2012). https://doi.org/10.1007/s00284-012-0188-2

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  • DOI: https://doi.org/10.1007/s00284-012-0188-2

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