ABSTRACT
In the present study, the genetic variability of the EG95 protein-coding gene in several animal and human isolates of Echinococcus granulosus was investigated. A total of 24 isolates collected from cattle, buffalo, sheep, goat, dog and man were amplified by Eg95-coding gene-specific primers. From the generated sequence information, a conceptual amino acid sequence was deduced. Phylogenetically, the Eg95 coding gene belongs to the Eg95-1/Eg95-2/Eg95-3/Eg95-4 cluster. Further confirmation on the maximum composite likelihood analysis revealed that the overall transition/transversion bias was 2.913. This finding indicated thatthere is bias towards transitional and transversional substitution. Using artificial neural networks, a B-cell epitope was predicted on primary sequence information. Stretches of amino acid residues varied between animal and human isolates when hydrophobicity was considered. Flexibility also varied between larval and adult stages of the organism. This observation is important to develop vaccines. However, cytotoxic T-lymphocyte epitopes on primary sequence data remained constant in all isolates. In this study, agretope identification started with hydrophobic amino acids. Amino acids with the same physico-chemical properties were present in the middle. The conformational propensity of the Eg95-coding gene of 156 amino acid residues had α-turns and β-turns, and α-amphipathic regions up to 129, 138–156 and 151–155 residues, respectively. The results indicated potential T-cell antigenic sites. The overall Tajima’s D value was negative (−2.404165), indicative of negative selection pressure.
ABSTRACT
The health surveillance through a copro-ovoscopical study was conducted to assess the gastrointestinal parasitic infections in captive canine {jackal (Canis aureus), wolf (Canis lupus), dhole (Cuon alpinus) and hyaena (Hyaena hyaena)} and feline carnivorans {lion (Panthera leo), tiger (Panthera tigris), leopard (Panthera pardus) and jungle cat (Felis chaus)}, maintained at Bannerghatta Biological Park, Bengaluru, Karnataka. A total of 41 fecal samples from apparently normal/healthy captive lions, 35 from tigers, 34 from leopards, 14 from jungle cats, 4 from dholes, 4 from wolves, 4 from jackals and 2 from hyenas were collected over a period of 12 months during 2015-2016 and were screened using classical parasitological techniques including sedimentation and floatation technique followed by microscopic identification of eggs. It revealed the prevalence of ova of 3 (7.31%) Strongyle sp., 8 (19.51%) Ancylostoma sp., 21 (51.21%) Toxocara sp., 16 (39.02%) Toxascaris leonina, 4 (9.75%) mixed (Ascaris and Ancylostoma sp.) in lions; 19 (54.28%) Toxocara sp., 8 (22.85%) Toxascaris leonina, 6 (17.14%) Ancylostoma sp., 2 (5.71%) oocyst of Eimeria sp., 2 (5.71%) Spirometra sp. in tigers; 13 (38.23%) Toxocara sp., 6 (17.64%) Ancylostoma sp. in leopards; 7 (50%) Isospora sp. and 2 (14.28%) Toxocara sp. in jungle cats; 2 (50%) Ancylostoma sp. in jackals; 2 (50%) Toxocara canis and 1 (25%) Ancylostoma sp. in wolves; 2 (50%) Toxocara canis in dholes; while ova of only 1 (50%) Ancylostoma sp. could be observed in hyaena. This preliminary data may be useful for health management of the said species in captivity.