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2016 ; 60
(ä): 114-9
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Generating a robust statistical causal structure over 13 cardiovascular disease
risk factors using genomics data
#MMPMID26827624
Yazdani A
; Yazdani A
; Samiei A
; Boerwinkle E
J Biomed Inform
2016[Apr]; 60
(ä): 114-9
PMID26827624
show ga
Understanding causal relationships among large numbers of variables is a
fundamental goal of biomedical sciences and can be facilitated by Directed
Acyclic Graphs (DAGs) where directed edges between nodes represent the influence
of components of the system on each other. In an observational setting, some of
the directions are often unidentifiable because of Markov equivalency. Additional
exogenous information, such as expert knowledge or genotype data can help
establish directionality among the endogenous variables. In this study, we use
the method of principle component analysis to extract information across the
genome in order to generate a robust statistical causal network among phenotypes,
the variables of primary interest. The method is applied to 590,020 SNP genotypes
measured on 1596 individuals to generate the statistical causal network of 13
cardiovascular disease risk factor phenotypes. First, principal component
analysis was used to capture information across the genome. The principal
components were then used to identify a robust causal network structure, GDAG,
among the phenotypes. Analyzing a robust causal network over risk factors reveals
the flow of information in direct and alternative paths, as well as determining
predictors and good targets for intervention. For example, the analysis
identified BMI as influencing multiple other risk factor phenotypes and a good
target for intervention to lower disease risk.