All issues > Volume 42(10); 1999

Original Article

J Korean Pediatr Soc. 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 KS Park¹, Nam Soo NS Park¹, Eun Ryoung ER Kim¹, Seok Ho SH Choi², Hyun Phil HP Cho², Young Ho YH Moon², Il Soo IS Kim²

¹Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
²Sung-Ae Life Science Research Institute, Sung-Ae General Hospital, Seoul, Korea

Correspondence Eun Ryoung ER Kim ,Email: 1

Abstract

Purpose
: 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.
Methods
: 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.
Results
: 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.
Conclusion
: 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.

Keywords :Rifampin-resistant Mycobacterium tuberculosis, rpoB, Line probe assay, Sequencing, Polymerase chain reaction