Rapid sequencing of the Mycobacterium tuberculosis pncA gene for detection of pyrazinamide susceptibility.
نویسندگان
چکیده
We developed a pyrazinamidase gene DNA-sequencing method to rapidly identify pyrazinamide resistance-causing mutations in GenoLyse-treated, smear-positive sputum specimens. The sensitivity and specificity were 90.9 and 100%, respectively, compared to those of MGIT drug susceptibility testing, after the exclusion of synonymous mutations and nonsynonymous mutations previously associated with susceptibility to pyrazinamide.
منابع مشابه
Rapid detection of Mycobacterium tuberculosis and pyrazinamide susceptibility related to pncA mutations in sputum specimens through an integrated gene-to-protein function approach.
Testing the pyrazinamide (PZA) susceptibility of Mycobacterium tuberculosis isolates is challenging. In a previous paper, we described the development of a rapid colorimetric test for the PZA susceptibility of M. tuberculosis by a PCR-based in vitro-synthesized-pyrazinamidase (PZase) assay. Here, we present an integrated approach to detect M. tuberculosis and PZA susceptibility directly from sp...
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Thirty-four pyrazinamide-resistant and 37 pyrazinamide-susceptible Mycobacterium tuberculosis complex strains were analyzed for pncA gene mutations. None of the sensitive strains had any mutations, apart from silent mutations, whereas all but one resistant strain showed pncA mutations. By using sequencing as a means of early resistance detection, the inconsistency of phenotypic pyrazinamide ass...
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The direct detection of pyrazinamide resistance in Mycobacterium tuberculosis is not routinely performed in many laboratories in the world because the drug is active only at acid pH, which also affects the growth of Mycobacterium tuberculosis. The pyrazinamidase enzyme, encoded by pncA gene, is necessary to convert prodrug pyrazinamide to its active form. Taking into account that nicotinamide, ...
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متن کاملpncA GENE SEQUENCE ANALYSIS FOR PYRAZINAMIDE RESISTANCE IN MYCOBACTERIUM TUBERCULOSIS FROM HIGH-INCIDENCE SETTING
Standard culture-based drug susceptibility testing (DST) of Mycobacterium tuberculosis (MTB) to pyrazinamide (PZA) is difficult to perform. PZA is a prodrug that has to be converted to its active form pyrazinoic acid (POA) by pyrazinamidase (PZase) enzyme, encoded by pncA gene and loss of PZase activity is associated with PZA resistance. To further define genetic basis of PZA resistance and det...
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عنوان ژورنال:
- Journal of clinical microbiology
دوره 52 11 شماره
صفحات -
تاریخ انتشار 2014