title: Tests of association for quantitative traits in nuclear families using principal components to correct for population stratification.
abstract: Traditional transmission disequilibrium test (TDT) based methods for genetic association analyses are robust to population stratification at the cost of a substantial loss of power. We here describe a novel method for family-based association studies that corrects for population stratification with the use of an extension of principal component analysis (PCA). Specifically, we adopt PCA on unrelated parents in each family. We then infer principal components for children from those for their parents through a TDT-like strategy. Two test statistics within the variance-components model are proposed for association tests. Simulation results show that the proposed tests have correct type I error rates regardless of population stratification, and have greatly improved power over two popular TDT-based methods: QTDT and FBAT. The application to the Genetic Analysis Workshop 16 (GAW16) data sets attests to the feasibility of the proposed method.
authors.affiliation: School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Yu-Fang
authors.initials: YF
authors.lastname: Pei
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Liu
authors.forename: Hong-Wen
authors.initials: HW
authors.lastname: Deng
mesh_terms: D005240:Feasibility Studies; D055106:Genome-Wide Association Study; D006801:Humans; D008957:Models, Genetic; D009679:Nuclear Family; D025341:Principal Component Analysis; D019655:Quantitative Trait, Heritable; D013223:Statistics as Topic
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