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Novel mutations detected from drug resistant Mycobacterium tuberculosis isolated from North East of Thailand

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Abstract

The emergence of drug-resistant tuberculosis is a major global public health threat. Thailand is one of the top 14 countries with high tuberculosis and multi-drug resistant tuberculosis rates. Immediate detection of drug-resistant tuberculosis is necessary to reduce mortality and morbidity by effectively providing treatment to ameliorate the formation of resistant strains. Limited data exist of mutation profiles in Northeastern Thailand. Here, 65 drug-resistant Mycobacterium tuberculosis isolates were used to detect mutations by polymerase chain reaction (PCR) and DNA sequencing. In the katG gene, mutations were occurred in 47 (79.7%) among 59 isoniazid resistant samples. For rpoB gene, 31 (96.9%) were observed as mutations in 32 rifampicin resistant isolates. Of 47 katG mutation samples, 45 (95.7%) had mutations in katG315 codon and 2 (4.3%) showed novel mutations at katG365 with amino acid substitution of CCG-CGG (Pro-Arg). Moreover, out of 31 rpoB mutation isolates, the codon positions rpoB516, rpoB526, rpoB531 and rpoB533 were 3 (9.7%), 8 (25.8%), 11 (35.5%) and 1 (3.2%), respectively. Seven isolates of double point mutation were found [rpoB516, 526; 1 (3.2%) and rpoB516, 531; 6 (19.4%)]. In addition, 1 (3.2%) sample had triple point mutation at codon positions rpoB516, 526 and 531. Common and novel mutation codons of the rpoB and katG genes were generated. Although DNA sequencing showed high accuracy, conventional PCR could be applied as an initial marker for screening drug-resistant Mycobacterium tuberculosis isolates in limit resources region. Mutations reported here should be considered when developing new molecular diagnostic methods for implementation in Northeastern Thailand.

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Acknowledgements

This research project was supported by Khon Kaen University Research Grant (Project Numbers 590038 and 6100033) and Centre for Research and Development of Medical Diagnostic Laboratories, Khon Kaen University. We would like to thank the KKU Scholarship for ASEAN and GMS Countries’ Personnel of Academic Year 2019, Khon Kaen University for providing a scholarship for Ei Phoo Thwe. Special thanks also go to Miss Kulrattana Rueangsak for her technical assistance.

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The present study was supported by Centre for Research and Development in Medical Diagnostic Laboratory, Faculty of Associated Medical Sciences, Khon Kaen University and the Graduate School, Khon Kaen University, Thailand.

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Correspondence to Arunnee Sangka.

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This study was approved by Khon Kaen University Ethics Committee for Human Research (HE631314).

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Thwe, E.P., Namwat, W., Pinlaor, P. et al. Novel mutations detected from drug resistant Mycobacterium tuberculosis isolated from North East of Thailand. World J Microbiol Biotechnol 37, 194 (2021). https://doi.org/10.1007/s11274-021-03163-7

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  • DOI: https://doi.org/10.1007/s11274-021-03163-7

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