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http://dx.doi.org/10.5713/ajas.17.0440

A genome-wide association study of social genetic effects in Landrace pigs  

Hong, Joon Ki (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Jeong, Yong Dae (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Cho, Eun Seok (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Choi, Tae Jeong (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Kim, Yong Min (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Cho, Kyu Ho (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
Lee, Jae Bong (Institute of Agriculture and Life Science, Gyeongsang National University)
Lim, Hyun Tae (Institute of Agriculture and Life Science, Gyeongsang National University)
Lee, Deuk Hwan (Department of Animal Life and Environment Science, Hankyong National University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.31, no.6, 2018 , pp. 784-790 More about this Journal
Abstract
Objective: The genetic effects of an individual on the phenotypes of its social partners, such as its pen mates, are known as social genetic effects. This study aims to identify the candidate genes for social (pen-mates') average daily gain (ADG) in pigs by using the genome-wide association approach. Methods: Social ADG (sADG) was the average ADG of unrelated pen-mates (strangers). We used the phenotype data (16,802 records) after correcting for batch (week), sex, pen, number of strangers (1 to 7 pigs) in the pen, full-sib rate (0% to 80%) within pen, and age at the end of the test. A total of 1,041 pigs from Landrace breeds were genotyped using the Illumina PorcineSNP60 v2 BeadChip panel, which comprised 61,565 single nucleotide polymorphism (SNP) markers. After quality control, 909 individuals and 39,837 markers remained for sADG in genome-wide association study. Results: We detected five new SNPs, all on chromosome 6, which have not been associated with social ADG or other growth traits to date. One SNP was inside the prostaglandin $F2{\alpha}$ receptor (PTGFR) gene, another SNP was located 22 kb upstream of gene interferon-induced protein 44 (IFI44), and the last three SNPs were between 161 kb and 191 kb upstream of the EGF latrophilin and seven transmembrane domain-containing protein 1 (ELTD1) gene. PTGFR, IFI44, and ELTD1 were never associated with social interaction and social genetic effects in any of the previous studies. Conclusion: The identification of several genomic regions, and candidate genes associated with social genetic effects reported here, could contribute to a better understanding of the genetic basis of interaction traits for ADG. In conclusion, we suggest that the PTGFR, IFI44, and ELTD1 may be used as a molecular marker for sADG, although their functional effect was not defined yet. Thus, it will be of interest to execute association studies in those genes.
Keywords
Candidate Genes; Social Genetic Effect; Average Daily Gain; Porcine Genome;
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