The association between single nucleotide polymorphisms of BRCA1 gene with mastitis in Holstein cattle

Enhancing disease resistance in animal production can be achieved by genetic improvement programs. Candidate gene polymorphism is one of the potential approaches for search of association between SNP within this gene phenotype of animals, particularly in MAS for mastitis of large dairy cattle populations. Polymorphism of exon 9 of the BRCA1 gene was investigated by the PCR-RFLP method in 60 Iranian Holstein cattle. In this study, 3 different alleles were recognized. Polymerase chain reaction-restricted fragment length polymorphism method was used to amplify, digestion and electrophoresis for a 219 base pair of bovine BRCA1 gene. A polymorphism was revealed by G-A single nucleotide polymorphism in +46126 position of BRCA1 gene. Observe genotype frequencies for KK, KL, LL were 0.27, 0.43 and 0.30 respectively, and allele frequencies for observed K and L allele were 0.48 and 0.52 accordingly. For analysis of variance, normality test and transformation of raw data for SSC records was performed based on previous main reports and literature reviews. GLM and logistic regression methods was used for association study between genotype and collected phenotype. As a final message of the present report, KK genotype was showed significantly affect SCC data and has tendency for low SCC score than other two genotypes. The results of present study indicated BRCA1 gene as an effective candidate gene could be benefit for mastitis resistant in Marker Assisted Selection strategies in dairy cattle.