Accuracy of genomic prediction using multiple Atlantic salmon populations

IF 3.6 1区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Afees A. Ajasa, Solomon A. Boison, Hans M. Gjøen, Marie Lillehammer
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Abstract

The accuracy of genomic prediction is partly determined by the size of the reference population. In Atlantic salmon breeding programs, four parallel populations often exist, thus offering the opportunity to increase the size of the reference set by combining these populations. By allowing a reduction in the number of records per population, multi-population prediction can potentially reduce cost and welfare issues related to the recording of traits, particularly for diseases. In this study, we evaluated the accuracy of multi- and across-population prediction of breeding values for resistance to amoebic gill disease (AGD) using all single nucleotide polymorphisms (SNPs) on a 55K chip or a selected subset of SNPs based on the signs of allele substitution effect estimates across populations, using both linear and nonlinear genomic prediction (GP) models in Atlantic salmon populations. In addition, we investigated genetic distance, genetic correlation estimated based on genomic relationships, and persistency of linkage disequilibrium (LD) phase across these populations. The genetic distance between populations ranged from 0.03 to 0.07, while the genetic correlation ranged from 0.19 to 0.99. Nonetheless, compared to within-population prediction, there was limited or no impact of combining populations for multi-population prediction across the various models used or when using the selected subset of SNPs. The estimates of across-population prediction accuracy were low and to some extent proportional to the genetic correlation estimates. The persistency of LD phase between adjacent markers across populations using all SNP data ranged from 0.51 to 0.65, indicating that LD is poorly conserved across the studied populations. Our results show that a high genetic correlation and a high genetic relationship between populations do not guarantee a higher prediction accuracy from multi-population genomic prediction in Atlantic salmon.
利用多个大西洋鲑鱼种群进行基因组预测的准确性
基因组预测的准确性部分取决于参考群体的规模。在大西洋鲑鱼育种计划中,通常存在四个平行种群,因此有机会通过合并这些种群来增加参考集的规模。通过减少每个种群的记录数量,多种群预测有可能降低记录性状(尤其是疾病)的成本和福利问题。在这项研究中,我们使用 55K 芯片上的所有单核苷酸多态性(SNPs),或根据等位基因替换效应估计值在不同种群中的符号选定的 SNPs 子集,使用大西洋鲑种群中的线性和非线性基因组预测(GP)模型,评估了多种群和跨种群预测抗阿米巴鳃病(AGD)育种值的准确性。此外,我们还研究了这些种群间的遗传距离、基于基因组关系估计的遗传相关性以及连锁不平衡(LD)阶段的持续性。种群间的遗传距离在 0.03 到 0.07 之间,而遗传相关性在 0.19 到 0.99 之间。不过,与种群内预测相比,在使用各种模型或使用选定的 SNPs 子集时,结合种群进行多种群预测的影响有限或没有影响。跨种群预测准确性的估计值较低,而且在一定程度上与遗传相关性估计值成正比。在使用所有 SNP 数据的情况下,相邻标记之间的 LD 阶段在不同种群间的持续性从 0.51 到 0.65 不等,这表明在所研究的种群间,LD 的保守性很差。我们的研究结果表明,种群间的高遗传相关性和高遗传关系并不能保证大西洋鲑的多种群基因组预测具有更高的预测准确性。
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来源期刊
Genetics Selection Evolution
Genetics Selection Evolution 生物-奶制品与动物科学
CiteScore
6.50
自引率
9.80%
发文量
74
审稿时长
1 months
期刊介绍: Genetics Selection Evolution invites basic, applied and methodological content that will aid the current understanding and the utilization of genetic variability in domestic animal species. Although the focus is on domestic animal species, research on other species is invited if it contributes to the understanding of the use of genetic variability in domestic animals. Genetics Selection Evolution publishes results from all levels of study, from the gene to the quantitative trait, from the individual to the population, the breed or the species. Contributions concerning both the biological approach, from molecular genetics to quantitative genetics, as well as the mathematical approach, from population genetics to statistics, are welcome. Specific areas of interest include but are not limited to: gene and QTL identification, mapping and characterization, analysis of new phenotypes, high-throughput SNP data analysis, functional genomics, cytogenetics, genetic diversity of populations and breeds, genetic evaluation, applied and experimental selection, genomic selection, selection efficiency, and statistical methodology for the genetic analysis of phenotypes with quantitative and mixed inheritance.
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