135 Gene Variants in Bola-Dmb, DECR1, Fasn and SREBF1 Associated with Conceptus Death on Day 16 of Pregnancy in Holstein Cows

Abstract Investigating the influences of single nucleotide polymorphisms (SNP) associated with conceptus death (CD) on day 16 of pregnancy could distinguish cows who have inferior value for fertility traits. We hypothesized that CD is associated with SNP genotypes that disrupt maternal recognition and lead to early pregnancy loss. RNA sequences from Holstein cow pregnancies (n = 15) with normal conceptuses (Norm) or CD were subjected to SNP discovery via Qiagen CLC Genomics Workbench. Selected SNP were based on previous fertility studies, differentially expressed genes within pregnancy development analyses and proximity to SNP associated with fertility traits in the Cattle QTL Database. A second cohort of Holstein cows (n = 500) was used to conduct a validation and genotype to phenotype analysis of candidate SNP (cSNP) via DNA from blood samples and farm records. PLINK software was used to remove cows (n = 34) missing more than >20% cSNP and remove cSNP with monomorphic alleles, minor allele frequency (MAF) < 10% and not in Hardy-Weinberg Equilibrium (>1e-15). The GLM-one way ANOVA was used for all statistical models in SAS. Statistically significant models (P 1 SNP associated with fertility traits from the Cattle QTL database. Quality control measures in PLINK reduced the number of Holstein cows in the second cohort to 466 and identified 4 cSNP associated with non-binary reproductive traits. Herein, we report an additional 4 cSNP discovered and validated with binary reproductive traits. The cSNP within genes were associated with the following roles: BOLA-DMB (antigen loading in the immune system), DECR1 (lipid metabolism), FASN (reconstitution of body reserves during pregnancy) and SREBF1 (synthesis of fatty acids). Cows with T allele, in BOLA-DMB and SREBF1, were less likely (P < 0.05) to become pregnant