A hybrid bayesian approach for genome-wide association studies on related individuals.
BACKGROUND
Both single marker and simultaneous analysis face challenges in GWAS due to the large number of markers genotyped for a small number of subjects. This large p small n problem is particularly challenging when the trait under investigation has low heritability.


METHODS
In this article, we propose a two-stage approach that is a hybrid method of single and simultaneous analysis designed to improve genomic prediction of complex traits. In the first stage, we use a Bayesian independent screening method to select the most promising SNPs. In the second stage, we rely on a hierarchical model to analyze the joint impact of the selected markers. The model is designed to take into account familial dependence in the different subjects, while using local-global shrinkage priors on the marker effects.


RESULTS
We evaluate the performance in simulation studies, and consider an application to animal breeding data. The illustrative data analysis reveals an encouraging result in terms of prediction performance and computational cost.
Human Genetic Center, University of Texas at Houston Health Science Center, Houston, USA and.
A
A
Yazdani
Department of Statistical Science, Duke University, Durham, North Carolina USA.
D B
DB
Dunson
D000818:Animals; D001499:Bayes Theorem; D001947:Breeding; D002417:Cattle; D055106:Genome-Wide Association Study / Q000379:methods*; D023281:Genomics / Q000379:methods; D005838:Genotype; D008957:Models, Genetic; D020641:Polymorphism, Single Nucleotide