Development and Evaluation of a Line Probe Assay for Rapid Identification of pncA Mutations in Pyrazinamide-Resistant Mycobacterium tuberculosis Strains
نویسندگان
چکیده
منابع مشابه
Characterization of pncA mutations in pyrazinamide-resistant Mycobacterium tuberculosis.
Pyrazinamide (PZA) is a first-line drug for short-course tuberculosis therapy. Resistance to PZA is usually accompanied by loss of pyrazinamidase (PZase) activity in Mycobacterium tuberculosis. PZase converts PZA to bactericidal pyrazinoic acid, and the loss of PZase activity is associated with PZA resistance. The gene (pncA) encoding the M. tuberculosis PZase has recently been sequenced, and m...
متن کاملpncA mutations in pyrazinamide-resistant Mycobacterium tuberculosis isolates in Portugal.
The nucleotide sequences of the pncA genes within 55 multidrug-resistant pyrazinamide-resistant Mycobacterium tuberculosis clinical isolates were determined. Fifty-three out of the 55 isolates were pyrazinamidase (PZase) negative. Four strains contained a wild-type pncA gene, and PZase activity was undetectable in two of these strains. Seven of the 18 identified pncA mutations found have not be...
متن کاملRapid Detection of Pnca Mutations in Pyrazinamide-Resistant Mycobacterium tuberculosis Clinical isolates
Pyrazinamide (PZA), an analog of nicotinamide, is a prodrug for tuberculosis which requires conversion to the bactericidal compound pyrazinoic acid by bacterial pyrazinamidase activity. Mutations leading to a loss of pyrazinamidase activity cause PZA resistance in Mycobacterium tuberculosis. Thus, the detection of pyrazinamidase activity makes the discrimination of PZA-resistant tuberculosis po...
متن کاملPyrazinamide resistance and pncA gene mutations in Mycobacterium tuberculosis.
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...
متن کاملRapid detection of mutations in rpoB gene of rifampicin resistant Mycobacterium tuberculosis strains by line probe assay.
BACKGROUND & OBJECTIVES Multidrug resistant (MDR) tuberculosis (TB) is a problem of increasing importance in the world due to limited treatment options. Resistance to rifampicin results from nucleotide changes in the gene encoding the beta subunit of the RNA polymerase (rpoB) of Mycobacterium tuberculosis. Rifampicin resistance is considered as a marker for MDR TB. The nature and frequency of m...
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ژورنال
عنوان ژورنال: Journal of Clinical Microbiology
سال: 2007
ISSN: 0095-1137,1098-660X
DOI: 10.1128/jcm.00352-07