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Tamilzhalagan, Sembulingam; Shanmugam, Sivakumar; Selvaraj, Ashok; Suba, Sakthi; Suganthi, Chittibabu; Moonan, Patrick K; Surie, Diya; Sathyanarayanan, Mukesh Kumar; Gomathi, Narayanan Shivaram; Jayabal, Lavanya; Sachdeva, Kuldeep Singh; Selvaraju, Sriram; Swaminathan, Soumya; Tripathy, Srikanth Prasad; Hall, Patricia J; Ranganathan, Uma Devi
Frontiers in microbiology, 11/2021, Letnik: 12Journal Article
India has a high burden of drug-resistant tuberculosis (DR TB) and many cases go undetected by current drug susceptibility tests (DSTs). This study was conducted to identify rifampicin (RIF) and isoniazid (INH) resistance associated genetic mutations undetected by current clinical diagnostics amongst persons with DR TB in Chennai, India. Retrospectively stored 166 DR TB isolates during 2013-2016 were retrieved and cultured in Löwenstein-Jensen medium. Whole genome sequencing (WGS) and MGIT DST for RIF and INH were performed. Discordant genotypic and phenotypic sensitivity results were repeated for confirmation and the discrepant results considered final. Further, drug resistance-conferring mutations identified through WGS were analyzed for their presence as targets in current WHO-recommended molecular diagnostics. WGS detected additional mutations for rifampicin and isoniazid resistance than WHO-endorsed line probe assays. For RIF, WGS was able to identify an additional 10% (15/146) of mutant isolates associated with borderline rifampicin resistance compared to MGIT DST. WGS could detect additional DR TB cases than commercially available and WHO-endorsed molecular DST tests. WGS results reiterate the importance of the recent WHO revised critical concentrations of current MGIT DST to detect low-level resistance to rifampicin. WGS may help inform effective treatment selection for persons at risk of, or diagnosed with, DR TB.
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in: SICRIS
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