Molecular Characterization and Immunodiagnostic Potential of Various Antigenic Proteins of Species Isolated from Sheep of North West Himalayan Region.

The control of the digenetic trematode has been the major challenge in both cattle and small ruminants as there is a paucity of an effective and commercial vaccine. Thus, the accurate identification and prepatent diagnosis of is an essential prerequisite for its successful prevention and control. In the present study, the morphologically identified specimens isolated from the liver and bile ducts of sheep () were validated through molecular data. The sequence analysis of ITS2 of our isolates showed high degree of similarity with and using BLAST function of NCBI. The phylogenetic analysis of our isolates showed a close relationship with previously described and isolates from different countries. The antigenic profile of somatic and E/S antigens of were revealed by SDS-PAGE and immunoblotting using sera from sheep naturally infected with . By SDS-PAGE, 20 distinct bands were revealed from crude somatic fraction. Immunoblotting analysis of these proteins with positive sera exhibited 8 sero-reactive bands ranging from 14 to 97 kDa. Among these 38 and 44 kDa bands were quite specific with high diagnostic specificity and sensitivity. The E/S fraction comprised 7 distinct bands, as revealed by SDS-PAGE analysis. Immunoblotting analysis of these proteins with positive sera exhibited 6 antigenic bands ranging from 23 - 54 kDa. Among these 27 and 33 kDa were found to be quite specific with high diagnostic specificity and sensitivity. The present study concludes that the protein bands of 38 and 44 kDa in somatic fraction and 27 and 33 kDa in E/S fraction can be used for the immunodiagnostic purpose for this economically important parasite, which may also entice further studies regarding their vaccine potential.