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EVALUATION STUDIES
JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
Identification of mycobacterial species by PCR restriction enzyme analysis of the hsp65 gene—an Indian experience.
Canadian Journal of Microbiology 2015 April
Nowadays, nontuberculous mycobacteria (NTM) often cause pulmonary and extrapulmonary disease. Species identification of NTM determines the line of treatment and management of the disease. The routine diagnostic methods, i.e., smear microscopy and biochemical identification, of nontuberculous mycobacteria are tedious and time consuming and not all laboratories can perform these tests on a routine basis. A PCR targeting the hsp65 gene was implemented using standard strains and was applied to 109 clinical isolates. The PCR-amplified product was subjected to restriction enzyme analysis using BstEII and HaeIII. The results obtained were compared with that of biochemical tests. Of 109 NTM, 107 were identified to species level. PCR plus restriction enzyme analysis (PRA) identified 12 types of NTM. Common species identified were Mycobacterium chelonae (32), a rapid growing NTM, and Mycobacterium avium complex (21), among the slow growing NTM. PRA and biochemical identification showed 95.32% (102/107) concordant results. PRA is fast, cheap, and accurate for identification of potentially pathogenic NTM.
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