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• W2000231790 abstract "As one approach to uncovering the genetic underpinnings of complex disease, individuals are measured at a large number of genetic variants (usually SNPs) across the genome and these SNP genotypes are assessed for association with disease status. We propose a new statistical method called Spectral-GEM for the analysis of genome-wide association studies; the goal of Spectral-GEM is to quantify the ancestry of the sample from such genotypic data. Ignoring structure due to differential ancestry can lead to an excess of spurious findings and reduce power. Ancestry is commonly estimated using the eigenvectors derived from principal component analysis (PCA). To develop an alternative to PCA we draw on connections between multidimensional scaling and spectral graph theory. Our approach, based on a spectral embedding derived from the normalized Laplacian of a graph, can produce more meaningful delineation of ancestry than by using PCA. Often the results from Spectral-GEM are straightforward to interpret and therefore useful in association analysis. We illustrate the new algorithm with an analysis of the POPRES data [Nelson et al., 2008]. Genet. Epidemiol. 34:51–59, 2010. © 2009 Wiley-Liss, Inc." @default.
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• W2000231790 date "2009-01-01" @default.
• W2000231790 modified "2023-09-25" @default.
• W2000231790 title "Discovering genetic ancestry using spectral graph theory" @default.
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• W2000231790 doi "https://doi.org/10.1002/gepi.20434" @default.
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