Analyses of GWAS Signal Using GRIN Identify Additional Genes Contributing to Suicidal Behavior
COMMUNICATIONS BIOLOGY（2024）
Oak Ridge Natl Lab | Univ Tennessee | Durham Vet Affairs Hlth Care Syst | Icahn Sch Med Mt Sinai | Univ Utah | Vanderbilt Univ | Duke Univ | Los Alamos Natl Lab | Corporal Michael J. Crescenz VA Medical Center
Abstract
Genome-wide association studies (GWAS) identify genetic variants underlying complex traits but are limited by stringent genome-wide significance thresholds. We present GRIN (Gene set Refinement through Interacting Networks), which increases confidence in the expanded gene set by retaining genes strongly connected by biological networks when GWAS thresholds are relaxed. GRIN was validated on both simulated interrelated gene sets as well as multiple GWAS traits. From multiple GWAS summary statistics of suicide attempt, a complex phenotype, GRIN identified additional genes that replicated across independent cohorts and retained biologically interrelated genes despite a relaxed significance threshold. We present a conceptual model of how these retained genes interact through neurobiological pathways that may influence suicidal behavior, and identify existing drugs associated with these pathways that would not have been identified under traditional GWAS thresholds. We demonstrate GRIN’s utility in boosting GWAS results by increasing the number of true positive genes identified from GWAS results. Using the software GRIN, GWAS results are refined by reducing false positive genes using biological network topology, allowing users to lower GWAS significance thresholds to identify additional genes associated with complex traits
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