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Bayesian group Lasso for nonparametric varying-coefficient models with application to functional genome-wide association studies
- Source :
- Annals of Applied Statistics 2015, Vol. 9, No. 2, 640-664
- Publication Year :
- 2015
-
Abstract
- Although genome-wide association studies (GWAS) have proven powerful for comprehending the genetic architecture of complex traits, they are challenged by a high dimension of single-nucleotide polymorphisms (SNPs) as predictors, the presence of complex environmental factors, and longitudinal or functional natures of many complex traits or diseases. To address these challenges, we propose a high-dimensional varying-coefficient model for incorporating functional aspects of phenotypic traits into GWAS to formulate a so-called functional GWAS or fGWAS. The Bayesian group lasso and the associated MCMC algorithms are developed to identify significant SNPs and estimate how they affect longitudinal traits through time-varying genetic actions. The model is generalized to analyze the genetic control of complex traits using subject-specific sparse longitudinal data. The statistical properties of the new model are investigated through simulation studies. We use the new model to analyze a real GWAS data set from the Framingham Heart Study, leading to the identification of several significant SNPs associated with age-specific changes of body mass index. The fGWAS model, equipped with the Bayesian group lasso, will provide a useful tool for genetic and developmental analysis of complex traits or diseases.<br />Comment: Published at http://dx.doi.org/10.1214/15-AOAS808 in the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
- Subjects :
- Statistics - Applications
Subjects
Details
- Database :
- arXiv
- Journal :
- Annals of Applied Statistics 2015, Vol. 9, No. 2, 640-664
- Publication Type :
- Report
- Accession number :
- edsarx.1509.04017
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1214/15-AOAS808