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Background : Tuberculosis (TB) remains an important cause of morbidity and mortality throughout the world. The surge of TB has been accompanied by an increase in multi-drug-resistant tuberculosis (MDR-TB). In this study, we developed a denaturing HPLC (DHPLC) method for detecting rpoB gene mutation as a rifampin resistance based on sequence. Methods : In this study, we used 99 mycobacterial isolates grown in Ogawa media. At first, we used a PCR method that can amplify the 235 bp and 136 bp rpoB DNAs of Mycobacterium tuberculosis complex (MTB) and Non-tuberculous mycobacteria (NTM). And then, PCR-restriction fragment length polymorphism (RFLP) of rpoB DNA (342 bp), which comprises the RifT region, was used for the differential identification of Mycobacteria. Finally, we detected these amplicons by DHPLC, compared to PCR-RFLP results, and performed sequencing. Results : Among 99 mycobacterial isolates, 80 (81%) were MTB and 19 (19%) were NTM. NTM were identified to 7 different species by DHPLC and PCR-RFLP. rpoB mutation was detected in 9 (11%) of the MTB specimens. These results were confirmed by using sequencing. Conclusions : DHPLC provided a rapid, simple, and automatable performance for detection of rifampin resistant Mycobacterium tuberculosis complex and would be helpful as a supplemental method in high-throughput clinical laboratories. (Korean J Lab Med 2008;28:95-102)

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