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http://dx.doi.org/10.5713/ajas.18.0274

Genetic architecture and candidate genes detected for chicken internal organ weight with a 600 K single nucleotide polymorphism array  

Dou, Taocun (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Shen, Manman (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Ma, Meng (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Qu, Liang (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Li, Yongfeng (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Hu, Yuping (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Lu, Jian (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Guo, Jun (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Wang, Xingguo (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Wang, Kehua (Jiangsu Institute of Poultry Science, Chinese Academy of Agricultural Sciences)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.32, no.3, 2019 , pp. 341-349 More about this Journal
Abstract
Objective: Internal organs indirectly affect economic performance and well-being of animals. Study of internal organs during later layer period will allow full utilization of layer hens. Hence, we conducted a genome-wide association study (GWAS) to identify potential quantitative trait loci or genes that potentially contribute to internal organ weight. Methods: A total of 1,512 chickens originating from White Leghorn and Dongxiang Blue-Shelled chickens were genotyped using high-density Affymetrix 600 K single nucleotide polymorphism (SNP) array. We conducted a GWAS, linkage disequilibrium analysis, and heritability estimated based on SNP information by using GEMMA, Haploview and GCTA software. Results: Our results displayed that internal organ weights show moderate to high (0.283 to 0.640) heritability. Variance partitioned across chromosomes and chromosome lengths had a linear relationship for liver weight and gizzard weight ($R^2=0.493$, 0.753). A total of 23 highly significant SNPs that associated with all internal organ weights were mainly located on Gallus gallus autosome (GGA) 1 and GGA4. Six SNPs on GGA2 affected heart weight. After the final analysis, five top SNPs were in or near genes 5-Hydroxytryptamine receptor 2A, general transcription factor IIF polypeptide 2, WD repeat and FYVE domain containing 2, non-SMC condensin I complex subunit G, and sonic hedgehog, which were considered as candidate genes having a pervasive role in internal organ weights. Conclusion: Our findings provide an understanding of the underlying genetic architecture of internal organs and are beneficial in the selection of chickens.
Keywords
Internal Organ; Genome-wide Association Study; Quantitative Trait; Chicken; Fitness Trait;
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