CNV analysis of gene reveals variation associated with growth traits in Chinese cattle.

Copy number variant (CNV), a common genetic polymorphism, is closely related to the phenotypic variation traits of organisms. Vesicle-associated membrane protein 7 gene () codes a protein, which is a member of the SNARE proteins family and plays an important role in the process of intracellular vesicle transport. In this study, a total of four cattle breeds (Yunling cattle, Xianan cattle, Pinan cattle, Jiaxian red cattle) were used to investigate the copy numbers, and we found an association relationship between CNV of gene and growth traits of cattle by SPSS 20.0 software. The results showed that the CNV type of gene in four cattle breeds had the same distribution, Duplication type occupies a dominant position among the four varieties. In Yunling cattle, the Duplication type of is significantly related to the height at the hip cross ( < 0.05), Individuals with Duplication type commonly have less performance on growth and development, which indicates that the Duplication type of the gene may have a negative effect on cattle growth. Individuals with the other two CNV types may become the breeding direction of the gene. This study provided a new perspective and basic material for the molecular genetics of the CNV of the gene, and also promoted the breeding progress of Chinese local cattle.