Department of Animal Science, Faculty of Agriculture, Erciyes University, Kayseri 38039, Turkey.
International Center for Livestock Research and Training Center, Ministry of Agriculture and Forestry, Ankara 06852, Turkey.
Genes (Basel). 2022 Aug 10;13(8):1414. doi: 10.3390/genes13081414.
In the current study, the genetic architecture of growth and linear type traits were investigated in Akkaraman sheep. Estimations of genomic heritability, genetic correlations, and phenotypic correlations were implemented for 17 growth and linear type traits of 473 Akkaraman lambs by the univariate and multivariate analysis of animal mixed models. Correspondingly, moderate heritability estimates, as well as high and positive genetic/phenotypic correlations were found between growth and type traits. On the other hand, 2 genome-wide and 19 chromosome-wide significant single nucleotide polymorphisms were found to be associated with the traits as a result of animal mixed model-based genome-wide association analyses. Accordingly, we propose several genes located on different chromosomes (e.g., , and ) as putative quantitative trait loci for the 22 growth and linear type traits studied. In our study, specific genes (e.g., and ) were found common between the traits studied, suggesting an interplay between the genetic backgrounds of these traits. The fact that four of the proposed genes ( and ) are located on sheep chromosome 2 confirms the importance of these genomic regions for growth and morphological structure in sheep. The results of our study are therefore of great importance for the development of efficient selection indices and marker-assisted selection programs, as well as for the understanding of the genetic architecture of growth and linear traits in sheep.
在本研究中,我们调查了阿克萨曼羊生长和线性体型性状的遗传结构。通过动物混合模型的单变量和多变量分析,对 473 只阿克萨曼羔羊的 17 个生长和线性体型性状进行了基因组遗传力、遗传相关和表型相关的估计。相应地,生长和体型性状之间存在中度遗传力估计值,以及高且正的遗传/表型相关性。另一方面,通过基于动物混合模型的全基因组关联分析,发现了 2 个全基因组显著和 19 个染色体显著的单核苷酸多态性与这些性状相关。因此,我们提出了几个位于不同染色体上的基因(例如、和)作为所研究的 22 个生长和线性体型性状的数量性状基因座。在我们的研究中,发现了一些共同存在于所研究性状之间的特定基因(例如和),这表明这些性状的遗传背景之间存在相互作用。提出的四个基因(和)中有四个位于绵羊染色体 2 上,这证实了这些基因组区域对绵羊生长和形态结构的重要性。因此,我们研究的结果对于开发有效的选择指数和标记辅助选择计划,以及理解绵羊生长和线性性状的遗传结构具有重要意义。
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