A Subset-Based Approach Improves Power and Interpretation for the Combined Analysis of Genetic Association Studies of Heterogeneous Traits

详细信息    查看全文

• 作者：Samsiddhi Bhattacharjee¹ ; Preetha Rajaraman² ; Kevin  ; B. Jacobs³ ; William  ; A. Wheeler⁴ ; Beatrice  ; S. Melin⁵ ; Patricia Hartge⁶ ; GliomaScan Consortium⁷ ; Meredith Yeager³ ; Charles  ; C. Chung⁸ ; Stephen  ; J. Chanock⁸ ; Nilanjan Chatterjee¹ ; ^{chattern@mail.nih.gov}
• 刊名：The American Journal of Human Genetics
• 出版年：2012
• 出版时间：4 May, 2012
• 年：2012
• 卷：90
• 期：5
• 页码：821-835
• 全文大小：582 K

文摘

Pooling genome-wide association studies (GWASs) increases power but also poses methodological challenges because studies are often heterogeneous. For example, combining GWASs of related but distinct traits can provide promising directions for the discovery of loci with small but common pleiotropic effects. Classical approaches for meta-analysis or pooled analysis, however, might not be suitable for such analysis because individual variants are likely to be associated with only a subset of the traits or might demonstrate effects in different directions. We propose a method that exhaustively explores subsets of studies for the presence of true association signals that are in either the same direction or possibly opposite directions. An efficient approximation is used for rapid evaluation of p values. We present two illustrative applications, one for a meta-analysis of separate case-control studies of six distinct cancers and another for pooled analysis of a case-control study of glioma, a class of brain tumors that contains heterogeneous subtypes. Both the applications and additional simulation studies demonstrate that the proposed methods offer improved power and more interpretable results when compared to traditional methods for the analysis of heterogeneous traits. The proposed framework has applications beyond genetic association studies.