Comparison of different imputation methods from low- to high-density panels using Chinese Holstein cattle
文献类型： 外文期刊
作者： Weng, Z. 1 ; Zhang, Z. 1 ; Zhang, Q. 1 ; Fu, W. 1 ; He, S. 1 ; Ding, X. 1 ;
作者机构： 1.China Agr Univ, Key Lab Anim Genet Breeding & Reprod, Minist Agr China, Natl Engn Lab Anim Breeding,Coll Anim Sci & Techn, Beijing 100193, Peoples R China
2.South China Agr Univ, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Coll Anim Sci,
关键词： missing genotypes;SNPs;imputation
期刊名称：ANIMAL （ 影响因子：3.24； 五年影响因子：3.223 ）
ISSN： 1751-7311
年卷期： 2013 年 7 卷 5 期
页码：
收录情况： SCI
摘要： Imputation of high-density genotypes from low- or medium-density platforms is a promising way to enhance the efficiency of whole-genome selection programs at low cost. In this study, we compared the efficiency of three widely used imputation algorithms (fastPHASE, BEAGLE and findhap) using Chinese Holstein cattle with Illumina BovineSNP50 genotypes. A total of 2108 cattle were randomly divided into a reference population and a test population to evaluate the influence of the reference population size. Three bovine chromosomes, BTA1, 16 and 28, were used to represent large, medium and small chromosome size, respectively. We simulated different scenarios by randomly masking 20%, 40%, 80% and 95% single-nucleotide polymorphisms (SNPs) on each chromosome in the test population to mimic different SNP density panels. Illumina Bovine3K and Illumina BovineLD (6909 SNPs) information was also used. We found that the three methods showed comparable accuracy when the proportion of masked SNPs was low. However, the difference became larger when more SNPs were masked. BEAGLE performed the best and was most robust with imputation accuracies >90% in almost all situations. fastPHASE was affected by the proportion of masked SNPs, especially when the masked SNP rate was high. findhap ran the fastest, whereas its accuracies were lower than those of BEAGLE but higher than those of fastPHASE. In addition, enlarging the reference population improved the imputation accuracy for BEAGLE and findhap, but did not affect fastPHASE. Considering imputation accuracy and computational requirements, BEAGLE has been found to be more reliable for imputing genotypes from low- to high-density genotyping platforms.
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