Leptin and leptin receptor gene polymorphisms are correlated with production performance in the Arctic fox

The polymerase chain reaction-single-strand conforma­tion polymorphism technique was employed to measure mononucleo­tide diversity in the coding region of the leptin and leptin receptor genes in the Arctic fox. The relationships between specific genetic mutations and reproductive performance in Arctic foxes were determined to im­prove breeding strategies. We found that a leptin gene polymorphism was significantly associated with body weight (P < 0.01), abdominal circumference (P < 0.01), and fur length (P < 0.01). Furthermore, a polymorphism in the leptin receptor gene was associated with carcass weight and guard hair length (P < 0.01). Leptin and leptin receptor gene combinatorial genotypes were significantly associated with abdominal circumference, fur length (P < 0.01), and body weight (P < 0.05). The leptin gene is thus a key gene affecting body weight, abdominal circum­ference, and fur length in Arctic foxes, whereas variations in the leptin receptor mainly affect carcass weight and guard hair. The marker loci identified in this study can be used to assist in the selection of Arctic foxes for breeding to raise the production performance of this species.