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arXiv 1705.09591stat.ME
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基因型缺失情况下带协变量的遗传风险函数估计

Estimation of Genetic Risk Function with Covariates in the Presence of Missing Genotypes

Annie J. Lee, Karen Marder, Helen Mejia-Santana, Avi Orr-Urtreger, Nir Giladi, Susan Bressman, Yuanjia Wang

摘要:

在遗传流行病学研究中,收集研究参与者亲属的家族史数据,并用于估计携带因果突变的个体的年龄特异性疾病风险。然而,由于亲自面谈以获取血液样本的费用高昂或亲属死亡,可能无法收集家庭成员的基因型数据。在此之前,在不考虑协变量的情况下,已经提出了删失混合数据中有效的非参数基因型特异性风险估计。由于有多个预测风险因素,风险估计需要多变量模型来解释可能同时影响疾病风险的其他协变量。因此,重要的是要考虑协变量的作用,在基因型特异性分布估计使用家族史数据。我们提出了一种估计方法,允许更精确的风险预测,通过控制个人特征,并将相互作用的影响与缺失的基因型在亲属,因此基因-基因相互作用和基因-环境相互作用可以在一个单一的模型的框架内处理。我们通过模拟来检查所提出的方法的性能,并将其应用于估计LRRK 2 G2019 S突变携带者中帕金森病(PD)的年龄特异性累积风险,使用具有PD遗传风险的一级亲属。通过在各种假设下设计未来的临床试验,证明了估计的载体风险的效用。这种样本量估计见于亨廷顿氏病文献中,使用HTT基因中CAG重复序列的异常扩增长度,但在PD文献中不太常见。

英文摘要:

In genetic epidemiological studies, family history data are collected on relatives of study participants and used to estimate the age-specific risk of disease for individuals who carry a causal mutation. However, a family member's genotype data may not be collected due to the high cost of in-person interview to obtain blood sample or death of a relative. Previously, efficient nonparametric genotype-specific risk estimation in censored mixture data has been proposed without considering covariates. With multiple predictive risk factors available, risk estimation requires a multivariate model to account for additional covariates that may affect disease risk simultaneously. Therefore, it is important to consider the role of covariates in the genotype-specific distribution estimation using family history data. We propose an estimation method that permits more precise risk prediction by controlling for individual characteristics and incorporating interaction effects with missing genotypes in relatives, and thus gene-gene interactions and gene-environment interactions can be handled within the framework of a single model. We examine performance of the proposed methods by simulations and apply them to estimate the age-specific cumulative risk of Parkinson's disease (PD) in carriers of LRRK2 G2019S mutation using first-degree relatives who are at genetic risk for PD. The utility of estimated carrier risk is demonstrated through designing a future clinical trial under various assumptions. Such sample size estimation is seen in the Huntington's disease literature using the length of abnormal expansion of a CAG repeat in the HTT gene, but is less common in the PD literature.

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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