J Korean Pediatr Soc.  1999 Oct;42(10):1403-1411.

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

• Park KS
• Park NS
• Kim ER
• Choi SH
• Cho HP
• Moon YH
• Kim IS

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.

Keyword

Rifampin-resistant Mycobacterium tuberculosis; rpoB; Line probe assay; Sequencing; Polymerase chain reaction

MeSH Terms

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
Codon
Collodion
DNA-Directed RNA Polymerases
Oligonucleotide Probes
RNA
RNA Polymerase II
Rifampin