National Institute for Research in Tuberculosisº Chetpet, Chennai-600031, India
Abstract
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.
Unissa, N., Narayanan, S., Suganthi, C., & Selvakumar, N. (2011). Detection of Isoniazid-Resistant Clinical isolates of Mycobacterium tuberculosis from India using Ser315Thr marker by Comparison of molecular methods. International Journal of Molecular and Clinical Microbiology, 1(2), 52-59.
MLA
Nusrath Unissa; Sujatha Narayanan; C. Suganthi; N. Selvakumar. "Detection of Isoniazid-Resistant Clinical isolates of Mycobacterium tuberculosis from India using Ser315Thr marker by Comparison of molecular methods". International Journal of Molecular and Clinical Microbiology, 1, 2, 2011, 52-59.
HARVARD
Unissa, N., Narayanan, S., Suganthi, C., Selvakumar, N. (2011). 'Detection of Isoniazid-Resistant Clinical isolates of Mycobacterium tuberculosis from India using Ser315Thr marker by Comparison of molecular methods', International Journal of Molecular and Clinical Microbiology, 1(2), pp. 52-59.
VANCOUVER
Unissa, N., Narayanan, S., Suganthi, C., Selvakumar, N. Detection of Isoniazid-Resistant Clinical isolates of Mycobacterium tuberculosis from India using Ser315Thr marker by Comparison of molecular methods. International Journal of Molecular and Clinical Microbiology, 2011; 1(2): 52-59.
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