Single-nucleotide polymorphisms in , and gene and their association with susceptibility to paratuberculosis in Indian cattle.

The aim of this study was to identify the single-nucleotide polymorphisms (SNPs) in bovine candidate genes , and , and explore the association between these SNPs with the occurrence of bovine paratuberculosis (PTB) disease. For this purpose, 549 animals were screened by a panel of four diagnostic tests, namely Johnin PPD test, ELISA test, faecal microscopy and IS900 blood PCR against ssp. (MAP) to develop case-control populations. SNPs were genotyped by polymerase chain reaction-restriction fragment length polymorphism method. Genotypic-phenotypic associations were assessed by the PROCLOGISTIC procedure of SAS 9.3. Of the seven SNPs; rs110353594 in gene and rs8193046 in gene were found to be associated with PTB. For SNP rs110353594, odds of CC and CT genotypes vs TT genotype was 1.543 (0.420-5.667; 95% CI) and 0.284 (0.104-0.774; 95% CI), respectively which means that CT genotype was more resistant than TT and CC genotypes against bovine PTB. For SNP rs8193046, odds of AA and AG genotypes versus GG genotype was 0.947 (0.296-3.034; 95% CI) and 3.947 (1.555-10.022; 95% CI), respectively, i.e. probability for getting an infection in animals with AG genotype was 3.94 times more as compared to GG genotype. Hence, a selection programme favouring CT genotype for rs110353594 and against AG genotype for rs8193046 may be beneficial for conferring resistance against bovine PTB.