Diversity of Variable Number Tandem Repeat Loci in Shigella Species Isolated from Pediatric Patients

Document Type : Original Article

Authors
1 Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
2 Department of Molecular and Cell Biology, Faculty of Basic Sciences, University of Mazandaran, Babolsar, Iran
3 Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
Abstract
Multilocus variable number tandem repeat (VNTR) analysis (MLVA) is a new typing method with several
advantages compared to other methods. Dissemination of Shigella is highly significant in developing countries.
Whilst Shigella is becoming increasingly important as an etiologic agent of pediatric shigellosis in Iran, little is
known about the genetic diversity of the local strains. Therefore, the aim of this study was to describe the
genetic diversity of Shigella species isolated from pediatric patients in Tehran, Iran. A total of 53 Shigella
isolates were obtained from 1070 patients with diarrhea (less than 12 years of age). All isolates were identified
by routine biochemical and serological tests. The confirmed Shigella isolates were further serogrouped (by the
slide agglutination) using slide agglutination method. MLVA assay with the seven loci resolved 53 Shigella
isolates into 36 different genotypes. Almost all the isolates were classified into five clonal complexes.
Furthermore, our MLVA assay could effectively distinguish the four Shigella species. This study has provided
valuable insights into the genetic heterogeneity of Shigella species in Tehran, Iran. Our findings can be helpful
for further epidemiological surveillance of Shigella species in this country in the future.
Keywords