Sequence kernel association analysis of rare variant set based on themarginal regression model for binary traits

摘要

Recent sequencing efforts have focused on exploring the influence of rare variants on the complex diseases. Gene-level based tests by aggregating information across rare variants within a gene have become attractive to enrich the rare variant association signal. Among them, the sequence kernel association test has proved to be a very powerful method for jointly testing multiple rare variants within a gene. In this article, we explore an alternative sequence kernel association test. We propose to use the univariate likelihood ratio statistics from the marginal model for individual variants as input into the kernel association test. We show how to compute its significance p-value efficiently based on the asymptotic chi-square mixture distribution. We demonstrate through extensive numerical studies that the proposed method has competitive performance. Its usefulness is further illustrated with application to associations between rare exonic variants and type 2 diabetes in the Atherosclerosis Risk in Communities (ARIC) Study. We identified an exome-wide significant rare variant set in the gene ZZZ3 worthy of further investigations.