Early Diagnosis of Rifampin-Resistant Mycobacterium tuberculosis by Gene Analysis of RNA Polymerase B Subunit.
- Author:
Ki Seok PARK
1
;
Nam Soo PARK
;
Eun Ryoung KIM
;
Seok Ho CHOI
;
Hyun Phil CHO
;
Young Ho MOON
;
Il Soo KIM
Author Information
1. Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Rifampin-resistant Mycobacterium tuberculosis;
rpoB;
Line probe assay;
Sequencing;
Polymerase chain reaction
- MeSH:
Child;
Codon;
Collodion;
DNA-Directed RNA Polymerases*;
Early Diagnosis*;
Humans;
Mycobacterium tuberculosis*;
Mycobacterium*;
Oligonucleotide Probes;
Polymerase Chain Reaction;
Rifampin;
RNA Polymerase II*;
RNA*;
Sequence Analysis, DNA;
Tuberculosis
- From:Journal of the Korean Pediatric Society
1999;42(10):1403-1411
- CountryRepublic of Korea
- Language:Korean
-
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.
