arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.06702stat.ME
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多种表型的子集测试和分析(STAMP)

Subset Testing and Analysis of Multiple Phenotypes (STAMP)

Andriy Derkach, Ruth M. Pfeiffer

摘要:

多个全基因组关联研究(GWAS)的荟萃分析对于检测单个或多个标记与复杂性状的关联是有效的。我们开发了一个灵活的程序(“STAMP”)的基础上的混合模型,以执行基于区域的荟萃分析不同的表型使用来自不同的GWAS的数据,并确定相关的表型的子集。我们的模型框架有助于区分真正的关联研究之间的异质性。作为关联的度量,我们计算每个表型的后验概率,即研究中的遗传区域是真正关联的。广泛的模拟表明,当真正相关的结果的比例为$\leq$ 50\%时,STAMP比Meta分析的标准方法更强大。对于其他设置,STAMP的功能与现有方法类似。我们举例说明我们的方法上的两个例子,染色体9p21上的一个区域与14种癌症的风险的关联,以及来自两个遗传区域的数量性状基因座(eQTL)的表达与使用癌症基因组图谱(TCGA)的数据在17种组织类型中测量的顺式SNP的关联。

英文摘要:

Meta-analysis of multiple genome-wide association studies (GWAS) is effective for detecting single or multi marker associations with complex traits. We develop a flexible procedure ("STAMP") based on mixture models to perform region based meta-analysis of different phenotypes using data from different GWAS and identify subsets of associated phenotypes. Our model framework helps distinguish true associations from between-study heterogeneity. As a measure of association we compute for each phenotype the posterior probability that the genetic region under investigation is truly associated. Extensive simulations show that STAMP is more powerful than standard approaches for meta analyses when the proportion of truly associated outcomes is $\leq$ 50\%. For other settings, the power of STAMP is similar to that of existing methods. We illustrate our method on two examples, the association of a region on chromosome 9p21 with risk of fourteen cancers, and the associations of expression of quantitative traits loci (eQTLs) from two genetic regions with their cis-SNPs measured in seventeen tissue types using data from The Cancer Genome Atlas (TCGA).

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