Transmission Based Conditional Logistic Model for Testing Main and Interaction Effects
- 1 School of Mathematics, Sun Yat-sen University, Guangzhou, China
- 2 Guangdong Province Key Laboratory of Computational Science, Sun Yat-sen University, Guangzhou, China
Abstract
Transmission disequilibrium test (TDT) is a popular family based genetic association method. Under multiplicative assumption, a conditional logistic regression for matched pair, affected offspring with allele transmitted from parents and pseudo-offspring (control) with allele non-transmitted from parents, was built to detect the main effects of genes and gene-covariate interaction s . When there exist genotype uncertainties, expectation-maximization (EM) algorithm was adopted to estimate the coefficients. The transmission model was applied to detect the association between M235T polymorphism in AGT gene and essential hypertension (ESH). Most of parents are not available in the 126 families from HongKong Chinese population. The results showed M235T is associat ed with hypertension and there is interaction between M235T and the case’s sex. The allele T is higher risk for male than female .
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