A Bayesian Partitioning Model for the Detection of Multilocus Effects in Case-Control Studies.
A Bayesian Partitioning Model for the Detection of Multilocus Effects in Case-Control Studies.
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DOI:
10.1159/000369858
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发表时间:
2015
期刊:
影响因子:
1.8
通讯作者:
Basu S
中科院分区:
文献类型:
--
作者:
Ray D;Li X;Pan W;Pankow JS;Basu S
Genome-wide association studies (GWASs) have identified hundreds of genetic variants associated with complex diseases, but these variants appear to explain very little of the disease heritability. The typical single locus association analysis in a GWAS fails to detect variants with small effect sizes and to capture higher order interaction among these variants. Multilocus association analysis provides a powerful alternative by jointly modeling the variants within a gene or a pathway and by reducing the burden of multiple hypothesis testing in a GWAS. We have proposed here a powerful and flexible dimension reduction approach to model multilocus association. We use a Bayesian partitioning model which clusters SNPs according to their direction of association, models higher order interactions using a flexible scoring scheme, and uses posterior marginal probabilities to detect association between the SNP-set and the disease. We have illustrated our model using extensive simulation studies and applied it detect multilocus interaction in a GWAS study with type 2 diabetes in Atherosclerosis Risk in Communities (ARIC). We demonstrate that our approach has better power to detect multilocus interactions than several existing approaches. When applied to ARIC dataset with 9328 individuals to study gene based associations for type 2 diabetes, our method identified some novel variants not detected by conventional single locus association analyses.
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