Genotypic characterization of multi-drug-resistant Mycobacterium tuberculosis isolates in Myanmar

Khin Saw Aye, Chie Nakajima, Tomoyuki Yamaguchi, Min Min Win, Mu Mu Shwe, Aye Aye Win, Thandar Lwin, Wint Wint Nyunt, Ti Ti, Yasuhiko Suzuki

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The number of multi-drug-resistant tuberculosis (MDR-TB) cases is rising worldwide. As a countermeasure against this situation, the implementation of rapid molecular tests to identify MDR-TB would be effective. To develop such tests, information on the frequency and distribution of mutations associating with phenotypic drug resistance in Mycobacterium tuberculosis is required in each country. During 2010, the common mutations in the rpoB, katG and inhA of 178 phenotypically MDR M. tuberculosis isolates collected by the National Tuberculosis Control Program (NTP) in Myanmar were investigated by DNA sequencing. Mutations affecting the 81-bp rifampicin (RIF) resistance-determining region (RRDR) of the rpoB were identified in 127 of 178 isolates (71.3%). Two of the most frequently affected codons were 531 and 526, with percentages of 48.3% and 14.0% respectively. For isoniazid (INH) resistance, 114 of 178 MDR-TB isolates (64.0%) had mutations in the katG in which a mutation-conferring amino acid substitution at codon 315 from Ser to Thr was the most common. Mutations in the inhA regulatory region were also detected in 20 (11.2%) isolates, with the majority at position -15. Distinct mutation rate and pattern from surrounding countries might suggest that MDR-TB has developed and spread domestically in Myanmar.

Original languageEnglish
Pages (from-to)174-179
Number of pages6
JournalJournal of Infection and Chemotherapy
Volume22
Issue number3
DOIs
Publication statusPublished - Mar 1 2016
Externally publishedYes

Keywords

  • Isoniazid
  • Myanmar
  • Mycobacterium tuberculosis
  • Resistance
  • Rifampicin

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases
  • Pharmacology (medical)

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