Estimating missing heritability for disease from genome-wide association studies - PubMed (original) (raw)
Estimating missing heritability for disease from genome-wide association studies
Sang Hong Lee et al. Am J Hum Genet. 2011.
Abstract
Genome-wide association studies are designed to discover SNPs that are associated with a complex trait. Employing strict significance thresholds when testing individual SNPs avoids false positives at the expense of increasing false negatives. Recently, we developed a method for quantitative traits that estimates the variation accounted for when fitting all SNPs simultaneously. Here we develop this method further for case-control studies. We use a linear mixed model for analysis of binary traits and transform the estimates to a liability scale by adjusting both for scale and for ascertainment of the case samples. We show by theory and simulation that the method is unbiased. We apply the method to data from the Wellcome Trust Case Control Consortium and show that a substantial proportion of variation in liability for Crohn disease, bipolar disorder, and type I diabetes is tagged by common SNPs.
Copyright © 2011 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.
Figures
Figure 1
The Liability Threshold Model for a Disease Prevalence of K An underlying continuous random variable determines disease status. If liability exceeds the threshold t, then individuals are affected.
Figure 2
The Distribution of Liability When Cases Are Oversampled as in a Case-Control Study
Comment in
- Population structure can inflate SNP-based heritability estimates.
Browning SR, Browning BL. Browning SR, et al. Am J Hum Genet. 2011 Jul 15;89(1):191-3; author reply 193-5. doi: 10.1016/j.ajhg.2011.05.025. Am J Hum Genet. 2011. PMID: 21763486 Free PMC article. No abstract available.
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