Amplification and cloning of exon regions from 1-4 of cathepsin B-like cysteine protease gene of Haemonchus contortus and immune response in lambs against cathepsin B-like cysteine protease fraction

CHARU PATHAK; S K GHOURI; S K KUMAR; M M SAXENA

doi:10.56093/ijans.v85i11.53042

Authors

CHARU PATHAK Senior Research Fellow, ICAR-Directorate of Knowledge Management in Agriculture, KAB-I, Pusa, New Delhi
S K GHOURI Principal Scientist, Maharaja Ganga Singh University of Bikaner, Bikaner, Rajasthan 334 001 India
S K KUMAR Scientist, National Research Center on Camel, Jorbeer
M M SAXENA Dean, Faculty of Science and Director Research, Maharaja Ganga Singh University, Bikaner

https://doi.org/10.56093/ijans.v85i11.53042

Keywords:

Cysteine proteases, Haemonchus contortus, Small ruminants, Vaccine

Abstract

Haemonchus contortus is an economically important, highly pathogenic blood-sucking nematode parasite of ruminants. A study was conducted to characterize the cathepsin B-like cysteine protease gene of H. contortus of Indian origin, which has been explored as potential target for vaccine development. Adult H. contortus worms were collected from the abomasum of sheep and goats and whole genomic DNA was extracted and amplified using appropriate primers. The expected amplicon of 767 bp was cloned into T-vector using GeNeiTM Instant cloning kit. Immunization study was conducted to examine the effect of cysteine protease fraction on the faecal egg counts in lambs. It was found that the egg per gram of faeces was lower in immunized group as compared to control group (at 10, 11, 12, and 15 week). At post mortem, the worms recovered from the abomasa were lower in immunized group (800.40±101.8) as compared to control group (950.93±300.29). The results indicated that the immunization with cysteine protease fraction in lambs reduces the faecal egg count, but did not remove all the worms from lambs.

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