title: katG mutations in isoniazid-resistant strains of Mycobacterium tuberculosis isolates from Belarusian patients.
abstract: The aim of this study was to investigate the frequency, location and type of katG mutations in Mycobacterium tuberculosis strains isolated from patients in Belarus. Mutations in different codons causing resistance to isoniazide in the gene of catalase peroxides (katG) in Belarusian strains was determined. 42 strains of Rif-r and Inhr(MDR) were isolated in different regions of Belarus. Culture susceptibility testing of all 42 strains revealed resistance to streptomycin (90%), 16 strains (43%) were resistant to etambutol. DNA Extraction, Standard PCR identification and katG gene amplification were performed. The most affected codons of katG gene were 315(95%), 316(16.2%), and 309(14.5%). Four types of mutations were identified in codon 315: AGC-->ACC (n=36)32.4%, AGC-->AGG (n=1) 0.9%, AGC-->AAC (n=2) 1.8%, AGC-->GGC (n=1) 0.9%. One type of mutation was found in codon 316: GGC-->AGC (n=18)16.2%, four types of mutations were detected in codon 309: GGT-->GGT (n=7)6.3%, GGT-->GCT (n=4)3.6%, GGT-->GTC (n=3)2.7%, GGT-->GGG (n=1)0.9%. Mutations in codon 309 make up 34%, in codon 316 (37%) and other types of mutations 29% of all detected mutations. In 2 isolated strains mutation were identified in codons 463, 35 and, in codons 454, 357 respectively and 2 isolates, there were not found any mutations. Concluding, all INH-r MBT had resistance-associated nucleotide changes mostly in codons 315.
authors.affiliation: Belarusian State Medical University, and Belarusian Research Institute for Epidemiology and Microbiology, Minsk, Belarus. saeedzaker20@yahoo.com
authors.forename: Saeed
authors.initials: S
authors.lastname: Zaker Bostanabad
authors.forename: Leonid P
authors.initials: LP
authors.lastname: Titov
authors.forename: Veranika V
authors.initials: VV
authors.lastname: Slizen
authors.forename: Mohammad
authors.initials: M
authors.lastname: Taghikhani
authors.forename: Ahmadreza
authors.initials: A
authors.lastname: Bahrmand
mesh_terms: D000995:Antitubercular Agents / Q000494:pharmacology* / Q000627:therapeutic use; D001426:Bacterial Proteins / Q000235:genetics*; D002374:Catalase / Q000235:genetics*; D003062:Codon / Q000235:genetics; D017931:DNA Primers; D004269:DNA, Bacterial / Q000032:analysis; D024881:Drug Resistance, Bacterial / Q000235:genetics*; D006801:Humans; D007538:Isoniazid / Q000494:pharmacology* / Q000627:therapeutic use; D008826:Microbial Sensitivity Tests; D009169:Mycobacterium tuberculosis / Q000187:drug effects / Q000235:genetics* / Q000302:isolation & purification; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D014397:Tuberculosis, Pulmonary / Q000188:drug therapy / Q000453:epidemiology / Q000209:etiology / Q000382:microbiology*; D014421:Turkey / Q000453:epidemiology
chemical_list: D000995:Antitubercular Agents; D001426:Bacterial Proteins; D003062:Codon; D017931:DNA Primers; D004269:DNA, Bacterial; D002374:Catalase; C480353:katG protein, Mycobacterium tuberculosis; D007538:Isoniazid