Comparison of drug resistance genotypes between Beijing and non-Beijing family strains of Mycobacterium tuberculosis in Korea
| Autor: | Sungweon Ryu, Young Soo Shim, Woo Jin Lew, Sang Nae Cho, Young Kil Park, O Jung Kwon, Won-Jung Koh, Sonya Shin, Gill Han Bai |
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| Rok vydání: | 2005 |
| Předmět: |
Microbiology (medical)
China Genotype Antitubercular Agents Microbial Sensitivity Tests Drug resistance Biology Microbiology Mycobacterium tuberculosis Bacterial Proteins Beijing Drug Resistance Bacterial Tuberculosis Multidrug-Resistant Prevalence medicine Humans Tuberculosis Pulmonary Molecular Biology Genetics Korea INHA Isoniazid bacterial infections and mycoses rpoB biology.organism_classification Mutation Rifampicin medicine.drug |
| Zdroj: | Journal of Microbiological Methods. 63:165-172 |
| ISSN: | 0167-7012 |
| Popis: | The frequency of resistance genotypes among Beijing and non-Beijing strains was compared using a reverse blot hybridization assay to detect mutations within genes associated with rifampicin (rpoB) and isoniazid (katG, inhA, and ahpC) resistance. Of the 743 Mycobacterium tuberculosis isolates, 569 (77%) belonged to Beijing family. The proportion of Beijing strains was significantly higher among MDR-TB isolates than among drug-susceptible strains (82% vs. 72%, p0.01). Genotype analysis of the rpoB gene revealed significantly lower rates of the Ser531Leu mutation rate among Beijing vs. non-Beijing MDR-TB strains (41% vs. 66%, p0.005). While the mutation for Ser315Thr in the katG gene was more common among Beijing vs. non-Beijing family strains (65% vs. 50%, p0.01), the mutation rate of promoter region of the inhA gene was lower among Beijing strains compared with non-Beijing strains (14% vs. 25%, p0.05). Reverse hybridization successfully detected over 80% of isoniazid-resistant strains and over 92% of rifampicin-resistant strains among Korean isolates. Significant differences in mutation rates in the rpoB, katG, and inhA genes between Beijing strains and non-Beijing strains could explain discrepancies in mutation rates of genotypes in different countries. Reverse hybridization was useful for rapid detection of isoniazid and rifampicin resistant strains. |
| Databáze: | OpenAIRE |
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