Molecular Assessment, Drug-Resistant Profile, and Spacer Oligonucleotide Typing (Spoligotyping) of Mycobacterium tuberculosis Strains From Tamaulipas, México

Virgilio Bocanegra-García, Elvira Garza-González, Wendy Lizeth Cruz-Pulido, Yahaira Lizeth Guevara-Molina, Rubén Cantú-Ramírez, Gloria M. González, Gildardo Rivera, José P. Palma-Nicolas

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Background: Tuberculosis remains a serious global health problem involving one-third of the world population. A wide diversity of Mycobacterium tuberculosis strains cause about 1.5 million deaths/year worldwide, but in developing countries, the genetic diversity of M. tuberculosis strains remains largely unknown. We conducted a first insight into the population diversity of M. tuberculosis strains from Tamaulipas, Mexico. Methods: Seventy-two M. tuberculosis strains were identified and genetic diversity determined by spoligotyping. Drug sensibility testing and punctual mutations in inhA, ahpC, rpoB, and katG genes were assessed. Results: Spoligotyping analysis showed a higher prevalence of LAM9 > T1 > Haarlem3 subfamilies among 53 spoligotype patterns. Unexpectedly, five Beijing strains conforming four unique spoligopatterns were recovered. The more frequently isolated strains (LAM9 and T1), but none of the Beijing strains, were found resistant to INH or RIF. Also, no drug resistance was found among Haarlem3 isolates. The katG315 gene mutation was found in 83% of INH-resistant strains, whereas rpoB526 were associated in only 43% of RIF M. tuberculosis drug-resistant strains. Conclusions: This and other studies report a high rate of orphan spoligotypes, which highlights the need for genotyping implementation as a routine technique for better understanding of M. tuberculosis strains in developing countries such as Mexico.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalJournal of Clinical Laboratory Analysis
Volume28
Issue number2
DOIs
StatePublished - Mar 2014

Keywords

  • Beijing
  • Spoligotyping
  • Tuberculosis
  • katG
  • rpoB

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