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arXiv 1404.7301stat.AP
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遗传关联研究的函数数据分析方法

A functional data analysis approach for genetic association studies

Matthew Reimherr, Dan Nicolae

摘要:

我们提出了一种新的方法,基于功能数据分析(FDA)检测一个或多个标量协变量和纵向响应之间的关联,同时纠正其他变量。我们的方法利用时间结构的纵向数据的方式,否则难以与多元方法。从FDA的角度来看,我们的程序在两个关键方面偏离了更成熟的方法。首先,在分析之前将原始纵向表型组装成功能轨迹。其次,我们探索了一种不直接基于主成分的关联检验。相反,我们专注于量化$L^2$变异性的减少,作为检测相关性的一种手段。我们的程序是由纵向全基因组关联研究,特别是儿童哮喘管理计划(CAMP),探索日常哮喘治疗的长期影响的动机。我们进行了模拟研究,以更好地了解FDA方法与传统多变量方法相比的优势(和/或劣势)。然后,我们将我们的方法应用于来自CAMP的数据。我们发现了一个潜在的新的关联与SNP的负面影响肺功能。此外,该SNP似乎与其中一种治疗具有相互作用效应。

英文摘要:

We present a new method based on Functional Data Analysis (FDA) for detecting associations between one or more scalar covariates and a longitudinal response, while correcting for other variables. Our methods exploit the temporal structure of longitudinal data in ways that are otherwise difficult with a multivariate approach. Our procedure, from an FDA perspective, is a departure from more established methods in two key aspects. First, the raw longitudinal phenotypes are assembled into functional trajectories prior to analysis. Second, we explore an association test that is not directly based on principal components. We instead focus on quantifying the reduction in $L^2$ variability as a means of detecting associations. Our procedure is motivated by longitudinal genome wide association studies and, in particular, the childhood asthma management program (CAMP) which explores the long term effects of daily asthma treatments. We conduct a simulation study to better understand the advantages (and/or disadvantages) of an FDA approach compared to a traditional multivariate one. We then apply our methodology to data coming from CAMP. We find a potentially new association with a SNP negatively affecting lung function. Furthermore, this SNP seems to have an interaction effect with one of the treatments.

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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