Resistances to anti-tuberculosis (TB) drugs are related to the mutations in the genome of the complex (MTBC). To expose the genomic mutations that cause anti-TB drug resistance. The GenoType MTBDRplus and MTBDRsl assays were used to detect genetic mutations. In this study of 1329 MTBC isolates, the sensitivities and specificities of genotypic methods for the detection of isoniazid (INH), rifampicin (RIF), ethambutol (EMB), and multi-drug resistance were 0.77, 0.84, 0.65, 0.89 and 0.99, 0.98, 0.67, 0.94, respectively. MUT3 mutations (S531L) of the gene for RIF resistance and MUT1 mutations (S315T1 and C15T) of the and genes for INH resistance were dominant. The most frequently observed mutations that created resistance to fluoroquinolones (FLQ) were MUT3C (D94G) of the gene. The predominant mutations of EMB resistance were MUT1B (M306V) of the gene. Aminoglycosides/cyclic peptides (AG/CP) resistance was rare. The molecular mechanisms of anti-TB drugs resistance in MTBC strains found in Istanbul are similar to those in the literature.
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