Major histocompatibility complex (DRB3) gene expression pattern indicates differences in Brucella abortus S19 vaccine induced immune response in Karan Fries and Sahiwal cattle Kumar D. Ravi1, Mishra S.K.2, Kumar Anshuman1, Vineeth M.R.1, Jayakumar S.2, Selvan A. Sakthivel2, Karuthadurai T.1, Chaudhuri Pallab3, Kataria R.S.1, Niranjan S.K.2,* Animal Genetics and Breeding Division, ICAR-National Dairy Research Institute, Karnal-132 001, Haryana, India 1ICAR-National Dairy Research Institute, Karnal-132 001, Haryana, India 2ICAR-National Bureau of Animal Genetic Resources, Karnal-132 001, Haryana 3Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India *Corresponding author's e-mail: saketniranjan@gmail.com
Online published on 15 March, 2019. Abstract Brucella abortus S19 strain vaccination is most effectively used as a tool to control the brucellosis in cattle. To understand the genetic basis of differences in immune responsiveness after immunization in cattle of different genotypes, we assessed the expression of MHC-DRB3 antigen receptor molecule in six each female calves of Karan Fries crossbreds (KF, Bos indicus x Bos taurus) and Sahiwal (Bos indicus) vaccinated with Brucella S19. Serum and peripheral blood mononuclear cells (PBMC) were isolated from blood collected on 0 (before vaccination) and 7, 14 and 28th day of vaccination. Antigenic response was assessed for these days in both the groups using Rose Bengal Plate form Test (RBPT). At 0d, the calves of both groups showed no antigen agglutination, confirming the calves free from the infection. The serum of 7d onward started showing the agglutination with more strong response in later stages specifically in KF, indicating increased immune response against Brucella. Therefore, RBPT can be used as earliest screening (7d onward) for Brucella antigenic reactivity in both cattle groups. The expression of DRB3 gene started with slight upregulation after vaccination, in general, however without any significant differences between two different genetic groups up to 14d. The significant (p<0.01) higher expression (8 times) of DRB3 was observed in KF than Sahiwal at 28d. The study indicated that antigenic reactivity and MHC-DRB3 expression elicited by Brucella S19 vaccination was more prominent in KFduring initial days, which may provide an extra advantage to the host for antigen binding, thereby better immune protection at later stage. Top Keywords Brucella abortus S19, Brucellosis, Cattle, Gene expression, MHC-DBR3. Top |