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The peroxisome proliferator-activated receptor (PPAR) signaling pathway is well known as a candidate pathway related to meat quality in mammals. In particular, there are many studies on the relationship between the PPAR signaling pathway and intramuscular fat. However, recent studies have demonstrated that genes in the PPAR signaling pathway are associated with carcass weight in cattle. Among 48 genes in the PPAR signaling pathway, 16 genes are related to the insulin that regulates the adipocyte glucose metabolism and thus affects body weight. Therefore, we conducted an investigation to try to identify candidate genes associated with the carcass weight and relationships between the expressions of these 16 genes in the loin muscle of Hanwoo (Korean cattle). From regression analysis, the three genes (ACSL6, FADS2, and ILK) showed significant effects with regard to carcass weight (p<0.05). Finally, we analyzed the common regulators of the significant genes from pathway analysis. The significant genes are regulated by insulin as well as D-glucose. These findings show that the differentially expressed genes are possible candidate genes associated with carcass weight in the longissimus muscle of Korean cattle.

Association of Insulin-related Genes Expression with Carcass Weight in Loin Muscle of Korean Cattle (Hanwoo)