Detection of Isoniazid-Resistant Clinical isolates of Mycobacterium tuberculosis from India using Ser315Thr marker by Comparison of molecular methods

نویسندگان

  • C. Suganthi National Institute for Research in Tuberculosisº Chetpet, Chennai-600031, India
  • N. Selvakumar National Institute for Research in Tuberculosisº Chetpet, Chennai-600031, India
  • Nusrath Unissa National Institute for Research in Tuberculosisº Chetpet, Chennai-600031, India
  • Sujatha Narayanan National Institute for Research in Tuberculosisº Chetpet, Chennai-600031, India
چکیده مقاله:

In this study, Substitution at codon Ser315 of katG gene, a reliable marker for isoniazid (INH) resistance was analyzed and compared by three molecular methods such as DNA  sequencing, polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) and PCR-single strand conformation polymorphism (PCR-SSCP) in 105 phenotypically resistant isolates obtained from various parts of India. Out of the 105 resistant isolates, 64 (61%) were found to be resistant by DNA sequencing, 54 (51%) by PCR-RFLP and 57 (54%) by PCR-SSCP methods. The results obtained using PCR-SSCP and PCR-RFLP methods were compared with those from DNA sequencing (gold standard). The sensitivity and specificity of PCR-RFLP were 84% and 100% respectively and corresponding values for PCR-SSCP method were 89% and 95% respectively.  The study has shown the comparison of the simple, rapid and cost effective methods with DNA sequencing targeting codon Ser315 of katG gene and suggests that PCR-RFLP and PCR-SSCP may be performed as alternative inexpensive methods in settings with a high prevalence of INH-resistant M. tuberculosis strains where sequencing cannot be afforded.

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منابع مشابه

detection of isoniazid-resistant clinical isolates of mycobacterium tuberculosis from india using ser315thr marker by comparison of molecular methods

in this study, substitution at codon ser315 of katg gene, a reliable marker for isoniazid (inh) resistance was analyzed and compared by three molecular methods such as dna sequencing, polymerase chain reaction restriction fragment length polymorphism (pcr-rflp) and pcr-single strand conformation polymorphism (pcr-sscp) in 105 phenotypically resistant isolates obtained from various parts of indi...

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Isoniazid, is the only antituberculous drug for which the relation between lack of virulence and acquisition of resistance was associated. INH-resistant mutants were shown to contain defective katG gene. Classical studies showed that INH-resistant south Indian isolates have lower virulence in guinea pigs and higher susceptibility to H2O2. It is of interest to assess the virulence in south India...

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virulence in isoniazid-resistant clinical isolates of mycobacterium tuberculosis from south india

isoniazid, is the only antituberculous drug for which the relation between lack of virulence and acquisition of resistance was associated. inh-resistant mutants were shown to contain defective katg gene. classical studies showed that inh-resistant south indian isolates have lower virulence in guinea pigs and higher susceptibility to h2o2. it is of interest to assess the virulence in south india...

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عنوان ژورنال

دوره 1  شماره 2

صفحات  52- 59

تاریخ انتشار 2011-12-28

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