Phenotypic and genotypic resistance to bedaquiline in patients with multi-drug-resistant tuberculosis—experiences from Armenia

Ardizzoni, E, Mulders, W, De Diego Fuertes, M, Hayrapetyan, A, Mirzoyan, A, Faqirzai, J, Khachatryan, N, Oganezova, I, Varaine, F, Bastard, M, Graulus, P, Meehan, CJ ORCID: https://orcid.org/0000-0003-0724-8343, Rigouts, L, de Jong, BC, Decroo, T, Hewison, C and Van Rie, A, 2025. Phenotypic and genotypic resistance to bedaquiline in patients with multi-drug-resistant tuberculosis—experiences from Armenia. Antimicrobial Agents and Chemotherapy. ISSN 0066-4804

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Abstract

Risk factors for baseline bedaquiline (BDQ) resistance, amplification during treatment, and correlations with treatment outcomes are not fully understood. This cohort included Armenian patients with multidrug-resistant TB predominantly fluoroquinolone-resistant enrolled between 2013 and 2015 in a BDQ compassionate use program. BDQ resistance at baseline and during treatment was assessed using MGIT (pDSTMGIT), minimal inhibitory concentration in 7H11 (MIC7H11), and whole-genome sequencing. Risk factors, such as treatment effectiveness or stage of the disease, were analyzed for association with baseline BDQ resistance, acquired BDQ resistance, and treatment outcome. Among 39 patients, baseline BDQ resistance was 6% (2/33) by pDSTMGIT and 7% (2/29) by MIC7H11. All four baseline isolates with an Rv0678 mutation were phenotypically resistant. During treatment, 48% of the patients acquired BDQ resistance by pDSTMGIT, and 52% acquired mutations at various frequencies (97% in Rv0678). None of the factors significantly contributed to baseline or acquired BDQ resistance. Unfavorable treatment outcome (41%) was more frequent in the presence of acquired Rv0678 mutations [odds ratio (OR) 132, 95% confidence interval (CI) 7.43, 2375], phenotypic BDQ resistance (OR 176, 95% CI 6.48, 2423), or MIC increase above or below the critical concentration (both OR 84.3, 95% CI 2.93, 2423) during treatment. For these highly treatment-experienced patients, low baseline prevalence but high incidence of acquired BDQ resistance was observed. Acquisition of mutations in BDQ candidate resistance genes, regardless of their frequency, or increased MICs during treatment, even below the critical concentration, should be seen as a warning sign of resistance amplification and increased risk of unfavorable treatment outcome.

Item Type:	Journal article
Publication Title:	Antimicrobial Agents and Chemotherapy
Creators:	Ardizzoni, E., Mulders, W., De Diego Fuertes, M., Hayrapetyan, A., Mirzoyan, A., Faqirzai, J., Khachatryan, N., Oganezova, I., Varaine, F., Bastard, M., Graulus, P., Meehan, C.J., Rigouts, L., de Jong, B.C., Decroo, T., Hewison, C. and Van Rie, A.
Publisher:	American Society for Microbiology
Date:	9 April 2025
ISSN:	0066-4804
Identifiers:	Number Type 10.1128/aac.01839-24 DOI 40202335 PubMed ID 2436835 Other
Rights:	© 2025 Ardizzoni et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	07 May 2025 10:45
Last Modified:	07 May 2025 10:45
URI:	https://irep.ntu.ac.uk/id/eprint/53544

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