Joint association analysis of bivariate quantitative and qualitative traits

被引：4
作者：
Mengdie Yuan
Guoqing Diao
机构：
[1] George Mason University,Department of Statistics
来源：
BMC Proceedings | / 5卷 / Suppl 9期
关键词：
Quantitative Trait; Minor Allele Frequency; Qualitative Trait; Genetic Analysis Workshop; Genotype Score;
D O I：
10.1186/1753-6561-5-S9-S74
中图分类号：
学科分类号：
摘要：
Univariate genome-wide association analysis of quantitative and qualitative traits has been investigated extensively in the literature. In the presence of correlated phenotypes, it is more intuitive to analyze all phenotypes simultaneously. We describe an efficient likelihood-based approach for the joint association analysis of quantitative and qualitative traits in unrelated individuals. We assume a probit model for the qualitative trait, under which an unobserved latent variable and a prespecified threshold determine the value of the qualitative trait. To jointly model the quantitative and qualitative traits, we assume that the quantitative trait and the latent variable follow a bivariate normal distribution. The latent variable is allowed to be correlated with the quantitative phenotype. Simultaneous modeling of the quantitative and qualitative traits allows us to make more precise inference on the pleiotropic genetic effects. We derive likelihood ratio tests for the testing of genetic effects. An application to the Genetic Analysis Workshop 17 data is provided. The new method yields reasonable power and meaningful results for the joint association analysis of the quantitative trait Q1 and the qualitative trait disease status at SNPs with not too small MAF.
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