Integration of a single-step genome-wide association study with a multi-tissue transcriptome analysis provides novel insights into the genetic basis of wool and weight traits in sheep
文献类型： 外文期刊
作者： Zhao, Bingru 1 ; Luo, Hanpeng 1 ; Huang, Xixia 2 ; Wei, Chen 2 ; Di, Jiang 3 ; Tian, Yuezhen 3 ; Fu, Xuefeng 3 ; Li, Bing 1 ;
作者机构： 1.China Agr Univ, Natl Engn Lab Anim Breeding, Key Lab Anim Genet Breeding & Reprod, Minist Agr,Coll Anim Sci & Technol, Beijing, Peoples R China
2.Xinjiang Agr Univ, Coll Anim Sci, Urumqi, Peoples R China
3.Xinjiang Acad Anim Sci, Inst Anim Sci, Key Lab Genet Breeding & Reprod Fine Wool Sheep C, Urumqi, Peoples R China
4.Scotlands Rural Coll SRUC, Roslin Inst Bldg, Roslin EH25 9RG, Midlothian, Scotland
5.ARS, Anim Genom & Improvement Lab, Henry A Wallace Beltsville Agr Res Ctr, USDA, Beltsville, MD USA
6.Univ Edinburgh, Inst Genet & Canc, MRC Human Genet Unit, Edinburgh, Midlothian, Scotland
7.Shandong Acad Agr Sci, Inst Anim Sci & Vet Med, Jinan, Peoples R China
期刊名称：GENETICS SELECTION EVOLUTION （ 影响因子：4.297； 五年影响因子：4.925 ）
ISSN： 0999-193X
年卷期： 2021 年 53 卷 1 期
页码：
收录情况： SCI
摘要： Background Genetic improvement of wool and growth traits is a major goal in the sheep industry, but their underlying genetic architecture remains elusive. To improve our understanding of these mechanisms, we conducted a weighted single-step genome-wide association study (WssGWAS) and then integrated the results with large-scale transcriptome data for five wool traits and one growth trait in Merino sheep: mean fibre diameter (MFD), coefficient of variation of the fibre diameter (CVFD), crimp number (CN), mean staple length (MSL), greasy fleece weight (GFW), and live weight (LW). Results Our dataset comprised 7135 individuals with phenotype data, among which 1217 had high-density (HD) genotype data (n = 372,534). The genotypes of 707 of these animals were imputed from the Illumina Ovine single nucleotide polymorphism (SNP) 54 BeadChip to the HD Array. The heritability of these traits ranged from 0.05 (CVFD) to 0.36 (MFD), and between-trait genetic correlations ranged from - 0.44 (CN vs. LW) to 0.77 (GFW vs. LW). By integrating the GWAS signals with RNA-seq data from 500 samples (representing 87 tissue types from 16 animals), we detected tissues that were relevant to each of the six traits, e.g. liver, muscle and the gastrointestinal (GI) tract were the most relevant tissues for LW, and leukocytes and macrophages were the most relevant cells for CN. For the six traits, 54 quantitative trait loci (QTL) were identified covering 81 candidate genes on 21 ovine autosomes. Multiple candidate genes showed strong tissue-specific expression, e.g. BNC1 (associated with MFD) and CHRNB1 (LW) were specifically expressed in skin and muscle, respectively. By conducting phenome-wide association studies (PheWAS) in humans, we found that orthologues of several of these candidate genes were significantly (FDR < 0.05) associated with similar traits in humans, e.g. BNC1 was significantly associated with MFD in sheep and with hair colour in humans, and CHRNB1 was significantly associated with LW in sheep and with body mass index in humans. Conclusions Our findings provide novel insights into the biological and genetic mechanisms underlying wool and growth traits, and thus will contribute to the genetic improvement and gene mapping of complex traits in sheep.
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