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arXiv 1504.00701stat.AP
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多性状关联研究中的误差控制策略

Many Phenotypes without Many False Discoveries: Error Controlling Strategies for Multi-Traits Association Studies

Christine Peterson, Marina Bogomolov, Yoav Benjamini, Chiara Sabatti

摘要:

多个表型的遗传基础,如基因表达,代谢物水平或成像特征,通常通过测试大量的假设来研究,探测每个性状与数十万个基因型变异之间的关联。适当的多重性调整是保证结果可重复性的关键,而错误发现率(FDR)经常被用作全局错误的度量。为了便于解释,通常对结果进行总结,以便报告重点关注发现的与某些表型相关的变异。我们发现,应用FDR控制程序的整个集合的假设未能控制错误发现的相关变异的比率,以及错误发现的表型的平均比率,这些变异的影响。我们提出了一个简单的分层测试程序,它允许控制这两个错误率,并提供了一个更可靠的基础上识别的变体与功能的影响。我们证明了这种方法的实用性,通过模拟研究比较各种错误率和措施的权力多性状的遗传关联研究。最后,我们应用所提出的方法来识别影响拟南芥开花表型的遗传变异,扩大了发现的范围。

英文摘要:

The genetic basis of multiple phenotypes such as gene expression, metabolite levels, or imaging features is often investigated by testing a large collection of hypotheses, probing the existence of association between each of the traits and hundreds of thousands of genotyped variants. Appropriate multiplicity adjustment is crucial to guarantee replicability of findings, and False Discovery Rate (FDR) is frequently adopted as a measure of global error. In the interest of interpretability, results are often summarized so that reporting focuses on variants discovered to be associated to some phenotypes. We show that applying FDR-controlling procedures on the entire collection of hypotheses fails to control the rate of false discovery of associated variants as well as the average rate of false discovery of phenotypes influenced by such variants. We propose a simple hierarchical testing procedure which allows control of both these error rates and provides a more reliable basis for the identification of variants with functional effects. We demonstrate the utility of this approach through simulation studies comparing various error rates and measures of power for genetic association studies of multiple traits. Finally, we apply the proposed method to identify genetic variants which impact flowering phenotypes in Arabdopsis thaliana, expanding the set of discoveries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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