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- W2909346791 abstract "Linear mixed models (LMMs) are widely used for heritability estimation in genome-wide association studies (GWAS). In standard approaches to heritability estimation with LMMs, a genetic relationship matrix (GRM) must be specified. In GWAS, the GRM is frequently a correlation matrix estimated from the study population's genotypes, which corresponds to a normalized Euclidean distance kernel. In this paper, we show that reliance on the Euclidean distance kernel contributes to several unresolved modeling inconsistencies in heritability estimation for GWAS. These inconsistencies can cause biased heritability estimates in the presence of linkage disequilibrium (LD), depending on the distribution of causal variants. We show that these biases can be resolved (at least at the modeling level) if one adopts a Mahalanobis distance-based GRM for LMM analysis. Additionally, we propose a new definition of partitioned heritability -- the heritability attributable to a subset of genes or single nucleotide polymorphisms (SNPs) -- using the Mahalanobis GRM, and show that it inherits many of the nice consistency properties identified in our original analysis. Partitioned heritability is a relatively new area for GWAS analysis, where inconsistency issues related to LD have previously been known to be especially pernicious." @default.
- W2909346791 created "2019-01-25" @default.
- W2909346791 creator A5011372682 @default.
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- W2909346791 date "2019-01-09" @default.
- W2909346791 modified "2023-09-24" @default.
- W2909346791 title "The Mahalanobis kernel for heritability estimation in genome-wide association studies: fixed-effects and random-effects methods" @default.
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- W2909346791 doi "https://doi.org/10.48550/arxiv.1901.02936" @default.
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