Rapid differentiation of Mycobacterium bovis and Mycobacterium tuberculosis based on a 12.7-kb fragment by a single tube multiplex-PCR

• Published in: Veterinary microbiology Vol. 109; no. 3; pp. 211 - 216
• Main Authors: Bakshi, C.S., Shah, D.H., Verma, Rishendra, Singh, R.K., Malik, Meenakshi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.08.2005; Elsevier Science
• Subjects: animal pathogenic bacteria; Animals; Biological and medical sciences; Cattle; disease detection; disease transmission; DNA, Bacterial - chemistry; DNA, Bacterial - genetics; Electrophoresis, Agar Gel - veterinary; Fundamental and applied biological sciences. Psychology; Humans; Microbiology; molecular sequence data; Mycobacterium; Mycobacterium bovis; Mycobacterium bovis - classification; Mycobacterium bovis - genetics; Mycobacterium tuberculosis; Mycobacterium tuberculosis - classification; Mycobacterium tuberculosis - genetics; nucleotide sequences; pathogen identification; PCR; polymerase chain reaction; Polymerase Chain Reaction - methods; Polymerase Chain Reaction - veterinary; Sensitivity and Specificity; strain differences; strains; transposons; Tuberculosis - diagnosis; Tuberculosis - microbiology; Tuberculosis, Bovine - diagnosis; Tuberculosis, Bovine - microbiology; zoonoses; Mycobacterium tuberculosis; Mycobacterium bovis; PCR; Polymerase chain reaction; Microbiology; Multiplex polymerase chain reaction; Mycobacteriales; Mycobacteriaceae; Bacteria; Actinomycetes; Veterinary
• ISSN: 0378-1135; 1873-2542
• DOI: 10.1016/j.vetmic.2005.05.015

The aim of this work was the design and validation of a rapid and easy single tube multiplex-PCR (m-PCR) assay for the unequivocal differential detection of Mycobacterium bovis and Mycobacterium tuberculosis. Oligonucleotide primers were based on the uninterrupted 229-bp sequence in the M. bovis genome and a unique 12.7-kb insertion sequence from the M. tuberculosis genome, which is responsible for species-specific genomic polymorphism between these two closely related pathogens. The m-PCR assay was optimized and validated using 22 M. bovis and 36 M. tuberculosis clinical strains isolated from diverse host species and 9 other non-tuberculous mycobacterial (NTM) strains. The designed primers invariably amplified a unique 168-bp ( M. bovis-specific) and 337-bp ( M. tuberculosis-specific) amplicon from M. bovis and M. tuberculosis strains, respectively. The accuracy of the assay, in terms of specificity, was 100%, as none of the NTM strains tested revealed any amplification product. As little as 20 pg of genomic DNA could be detected, justifying the sensitivity of the method. The m-PCR assay is an extremely useful, simple, reliable and rapid method for routine differential identification of cultures of M. bovis and M. tuberculosis. This m-PCR may be a valuable diagnostic tool in areas of endemicity, where bovine and human tuberculosis coexist, and the distinction of M. bovis from M. tuberculosis is required for monitoring the spread of M. bovis to humans.