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| Content Provider | PubMed Central |
|---|---|
| Author | Lau, Ricky W. T. Ho, Pak-leung Kao, Richard Y. T. Yew, Wing-wai Lau, Terrence C. K. Cheng, Vincent C. C. Yuen, Kwok-yung Tsui, Stephen K. W. Chen, Xinchun Yam, Wing-cheong |
| Copyright Year | 2011 |
| Abstract | A PCR-sequencing assay was evaluated for direct detection of mutations in the quinolone resistance-determining region (QRDR) of gyrase A (gyrA) gene in fluoroquinolone-resistant Mycobacterium tuberculosis in respiratory specimens. As determined by gyrA QRDR analysis, complete concordance of genotypic and phenotypic fluoroquinolone resistance was demonstrated. Our results indicate that the assay is a rapid and reliable method for the diagnosis of fluoroquinolone-resistant tuberculosis, facilitating timely clinical management and public health control. Using the assay, we detected a novel gyrA Ala74Ser mutation in M. tuberculosis directly from sputum specimens. The functional effect of the Ala74Ser mutant was verified through the study of the DNA supercoiling inhibitory activity of fluoroquinolones against the recombinant gyrase. The drug-mediated gyrase-DNA cleavage complex model suggests perturbation of the gyrA-gyrA dimer interface caused by the Ala74Ser mutation probably disturbs the putative quinolone binding pocket and leads to the reduction of the drug binding affinity. A number of gyrA mutations (Glu21Gln, Ser95Thr, and Gly668Asp) were also characterized to be natural polymorphisms not associated with fluoroquinolone resistance. |
| Related Links | http://dx.doi.org/10.1128/aac.00920-10 |
| Ending Page | 614 |
| Page Count | 7 |
| Starting Page | 608 |
| File Format | |
| ISSN | 00664804 |
| e-ISSN | 10986596 |
| Journal | Antimicrobial Agents and Chemotherapy |
| Issue Number | 2 |
| Volume Number | 55 |
| Language | English |
| Publisher | American Society for Microbiology (ASM) |
| Publisher Date | 2011-02-01 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology (ASM) |
| Subject Keyword | Pharmacology (medical) Pharmacology Infectious Diseases Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Infectious Diseases Pharmacology Pharmacology (medical) |
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