Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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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)
  • Received : 2018.04.09
  • Accepted : 2018.07.23
  • Published : 2019.03.01
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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.

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References

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