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• W422014744 abstract "Most complex diseases are influenced jointly by genes (G) and environmental or nongenetic attributes (E). Gene-environment interaction (G×E) is measured by statistical interaction between G and E, which occurs when genotype relative risks (GRRs) vary with E. In this thesis, we explore the sources of spurious G×E and propose a data-smoothing approach to G×E for case-parent trio data. In the first project, we address the problem of making inference about G×E based on the transmission rates of alleles from parents to affected offspring. Since GRRs that vary with E lead to transmission rates that do too, transmission rates have been used to make inference about G×E. However transmission-based tests of G×E are found to be invalid in general. To understand the bias of the transmission-based test, we derive theoretical transmission rates and compare their variation with E to that in the GRRs. Through simulation, we investigate the practical implication of the bias. Valid approaches that are not based on transmission rates require specifying or are designed to work well under a parametric form for G×E. In the second project, we develop a data-smoothing method to explore G×E that does not require model specification for the interaction component when we work with genotypes for a causal marker. The data-driven method produces graphical displays of G×E that suggest its form. For testing significance of G×E, we take a permutation approach to account for the additional uncertainty introduced by the smoothing process. For many approaches to inference of G×E with case-parent trio data, including our own, a key assumption is that the test marker is causal; however, in reality, it may not be causal but in linkage disequilibrium with a causal locus. In this case, the approaches can give a false impression of G×E due to a form of population" @default.
• W422014744 created "2016-06-24" @default.
• W422014744 creator A5020714461 @default.
• W422014744 date "2012-04-16" @default.
• W422014744 modified "2023-09-26" @default.
• W422014744 title "Inferring gene-environment interaction from case-parent trio data: evaluation of and adjustment for spurious GxE and development of a data-smoothing method to uncover true GxE" @default.
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• W422014744 hasPublicationYear "2012" @default.
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