Molecular characterization of Hymenolepis nana based on nuclear rDNA ITS2 gene marker
Introduction: Hymenolepis nana is a zoonotic tapeworm with widespread distribution. The goal of the present study was to identify the parasite in the specimens collected from NorthWestern regions of Iran using PCR-sequencing method.
Methods: A total of 1521 stool samples were collected from the study individuals. Initially, the identification of hymenolepis nana was confirmed by parasitological method including direct wet-mount and formalin-ethyl acetate concentration methods. Afterward, PCR-sequencing analysis of ribosomal ITS2 fragment was targeted to investigate the molecular identification of the parasite.
Results: Overall, 0.65% (10/1521) of the isolates were contaminated with H. nana in formalin-ethyl acetate concentration. All ten isolates were succefully amplified by PCR and further sequenced. The determined sequences were deposited in GenBank under the accession numbers MH337810 -MH337819.
Conclusion: Our results clarified the presence of H. nana among the patients in the study areas. In addition, the molecular tech- nique could be accessible when the human eggs are the only sources available to identify and diagnose the parasite.
Keywords: Hymenolepis nana, rDNAITS2, PCR, Iran.