In Vitro Isolation and Characterization of Oxazolidinone-Resistant Mycobacterium tuberculosis
نویسندگان
چکیده
منابع مشابه
In Vitro Isolation and Characterization of Oxazolidinone-Resistant Mycobacterium tuberculosis
Oxazolidinones are promising candidates for the treatment of Mycobacterium tuberculosis infections. We isolated linezolid-resistant strains from H37Rv (Euro-American) and HN878 (East-Asian) strains; resistance frequencies were similar in the two strains. Mutations were identified in ribosomal protein L3 (RplC) and the 23S rRNA (rrl). All mutant strains were cross resistant to sutezolid; a subse...
متن کاملCharacterization of spontaneous, In vitro-selected, rifampin-resistant mutants of Mycobacterium tuberculosis strain H37Rv.
Resistance to rifampin in Mycobacterium tuberculosis results from mutations in the gene coding for the beta subunit of RNA polymerase (rpoB). At least 95% of rifampin-resistant isolates have mutations in rpoB, and the mutations are clustered in a small region. About 40 distinct point mutations and in-frame insertions and deletions in rpoB have been identified, but point mutations in two codons,...
متن کاملIMPORTANCE OF CATALASE ENZYME IN VIRULENCE OF ISONIAZID RESISTANT ST RAINS OF MYCOBACTERIUM TUBERCULOSIS IN GUINEAPIGS
In this study, twenty-five strains of Mycobacterium tuberculosis resistant to isoniazid (INH) were isolated from patients with tuberculosis (TB). Nine strains (36%) were found to be virulent in guinea-pigs [root index virulence (RIV» 1 ]. The remaining sixteen strains (64%) were non-virulent (RIV <1). Of the nine strains resistant to INH as well as virulent to guinea-pigs, eight of them wer...
متن کاملCharacterization 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 کامل[Phenotypic characterization of pyrazinamide-resistant Mycobacterium tuberculosis isolated in Poland].
INTRODUCTION Pyrazinamide (PZA) is an important first-line antituberculous drug, which is applied together with INH, RMP, EMB and SM. This drug plays a unique role in the first phase of TB therapy because it is active within macrophages and kills tubercule bacilli. Testing of the resistibility of Mycobacterium tuberculosis to PZA is technically difficult because PZA is active only at acid pH. T...
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ژورنال
عنوان ژورنال: Antimicrobial Agents and Chemotherapy
سال: 2017
ISSN: 0066-4804,1098-6596
DOI: 10.1128/aac.01296-17