Helicobacter pylori 23S rRNA gene mutations associated with clarithromycin resistance in chronic gastritis in Vietnam

  • Van Huy Tran Hue University, Hue, Vietnam
  • Thi Minh Thi Ha Hue University, Hue, Vietnam
  • Phan Tuong Quynh Le Hue University, Hue, Vietnam
  • Viet Nhan Nguyen Hue University, Hue, Vietnam
  • Trung Nam Phan Hue University, Hue, Vietnam
  • Bianca Paglietti University of Sassari, Sassari, Italy
Keywords: Clarithromycin resistance, A2142G, A2143G, A2142C, 23S rRNA gene, Helicobacter pylori

Abstract

Introduction: Data about the prevalence of the A2142C, A2142G, and A2143G mutations in 23S rRNA gene is still limited. The aim of this study was to determine the prevalence of these mutations in 23S rRNA gene of H. pylori vietnamese strains.

Methodology: One hundred and sixty-nine patients with H. pylori-positive chronic gastritis were examined. H. pylori was detected by rapid urease test and Polymerase chain reaction (PCR). Total DNA was extracted from gastric biopsy specimens. A2142C, A2142G, and A2143G mutations were detected by DNA sequencing and PCR-restriction fragment length polymorphism (PCR-RFLP).

Results: A2143G mutation was detected in 36.1% of samples, A2142G mutation in 3.6%, while A2142C mutation was not found in any case. The mixture of wild-type and mutation strains was found in 50% of specimens with A2142G, in 23% of specimens with A2143G mutation. There was no association of 23S rRNA gene point mutations with gender or age. However, an association between the heterogeneity of mutation and age was evidenced, with mean age of the group of pure A2143G higher than the group of wild-type/A2143G mixture, and rate of the wild-type/A2143G mixture higher in patients under 40 years of age.

Conclusion: A2143G mutation was prominent, while A2142C mutation was not found in the 23S rRNA gene. PCR-RFLP has revealed a reliable assay allowing a rapid and cost-effective detection of clarithromycin-resistant strains. This is useful in countries as Vietnam with high prevalence of clarithromycin-resistance before choosing optimal therapy for H. pylori eradication.

Author Biography

Van Huy Tran, Hue University, Hue, Vietnam

Hue University of Medicine and Pharmacy - Hue University

Published
2018-07-31
How to Cite
1.
Tran VH, Ha TMT, Le PTQ, Nguyen VN, Phan TN, Paglietti B (2018) Helicobacter pylori 23S rRNA gene mutations associated with clarithromycin resistance in chronic gastritis in Vietnam. J Infect Dev Ctries 12:526-532. doi: 10.3855/jidc.10000
Section
Original Articles