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Early Diagnosis of Rifampin-Resistant Mycobacterium tuberculosis by Gene Analysis of RNA Polymerase B Subunit

Journal of the Korean Pediatric Society 1999;42(10):1403-1411.
Published online October 15, 1999.
Early Diagnosis of Rifampin-Resistant Mycobacterium tuberculosis by Gene Analysis of RNA Polymerase B Subunit
Ki Seok Park1, Nam Soo Park1, Eun Ryoung Kim1, Seok Ho Choi2, Hyun Phil Cho2, Young Ho Moon2, Il Soo Kim2
1Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
2Sung-Ae Life Science Research Institute, Sung-Ae General Hospital, Seoul, Korea
결핵균의 RNA Polymerase B Subunit 유전자 분석에 의한 Rifampin 내성 결핵균의 조기진단
박기석1, 박남수1, 김은령1, 최석호2, 조현필2, 문영호2, 김일수2
1성애병원 소아과
Eun Ryoung Kim, Email: 1
: The control of tuberculosis is seriously threatened worldwide by the recently emerging multidrug-resistant Mycobacterium tuberculosis. As a result, early detection of drug resistant M.tuberculosis strain has become very important but conventional laboratory methods are time consuming and delayed results often affect patients adversely in controlling tuberculosis. The authors studied the usefulness of the line probe assay to determine the mutaion in rpoB gene of rifampin resistant M.tuberculosis and to find out if this method can substitute conventional methods in the detection of resistant strain.
: This study employed 40 clinical samples of M.tuberculosis which had been determined by culture and drug sensitivity test. After amplification of rpoB-the gene for the B subunit of the RNA polymerase-by PCR, the amplified products were hybridized with specific oligonucleotide probes immobilized on nitrocellulose strip and direct DNA sequencing was also performed. The results were compared with those of the classical susceptibility test.
: Among the 40 samples, 10 were identified as drug resistant strain by classical drug susceptibility test. Three of the ten resistant samples were rifampin resistant strains, which were identified by either method. All mutations were clustered within the region of 69bp of rpoB and all were single nucleotide mutations. Two isolates had a TCG→TTG(serine→leucine) mutation in codon 522. One isolate had a CAC→CTC(histidine→leucine) mutation in codon 526.
: In contrast to culture and sensitivity tests, line probe assay is an easy and speedy method for detecting rifampin resistant M.tuberculosis in clinical samples as well as a helpful tool for choosing antituberculosis drug in children.
Key Words: Rifampin-resistant Mycobacterium tuberculosis, rpoB, Line probe assay, Sequencing, Polymerase chain reaction

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