Possibilities of using nested PCR-RFLP for taxonomic identification of L3 larvae of the family Trichostrongylidae, Leiper, 1912

The purpose of the research is to apply molecular genetic research methods to identify the taxonomic affiliation of gastrointestinal parasitic sheep nematodes of the family Trichostrongylidae using nested PCR followed by the restriction fragment length polymorphism (RFLP) analysis. Materials and methods . Parasitic nematodes, L3 Strongylata larvae obtained from incubated fecal samples of sheep. The genomic DNA was isolated using a commercial kit for DNA extraction from micro-quantities of tissues (Synthol, Moscow) as per the manufacturer’s guidelines. For DNA amplification, a T-100 Bio-Rad thermal cycler and a commercial Eurogen Master Mix reagent kit were used. The PCR regime was performed according to the WAAVP guidelines, 2006. The restriction endonuclease Rsa I of amplified Trichostrongylidae fragments was performed according to guidelines of the enzyme manufacturer (Sibenzyme, Novosibirsk). Results and discussion . To determine the taxonomic affiliation of Strongylata larvae isolated after incubation of feces from sheep, molecular genetic studies were performed using nested PCR followed by the restriction fragment length polymorphism (RFLP) analysis. This method makes it possible to identify, with the least effort, the genotypes of three species of Strongylata Haemonchus contortus, Trichostrongylus colubriformis, and Teladorsagia circumcincta at the larval stage.