Digging deeper into GWAS signal using GRIN implicates additional genes contributing to suicidal behavior
Kyle A. Sullivan,
J. Izaak Miller,
Angelica M. Walker,
Douglas M Ruderfer,
International Suicide Genetics Consortium,
VA Million Veteran Program,
MVP Suicide Exemplar Workgroup,
Michael R. Garvin,
John P. Pestian,
Jean C Beckham,
David W. Oslin,
Nathan A Kimbrel,
Daniel A. Jacobson,
Posted 25 Apr 2022
medRxiv DOI: 10.1101/2022.04.20.22273895
Posted 25 Apr 2022
Genome-wide association studies (GWAS) identify genetic variants underlying complex traits but are limited by stringent genome-wide significance thresholds. Here we dramatically relax GWAS stringency by orders of magnitude and apply GRIN (Gene set Refinement through Interacting Networks), which increases confidence in the expanded gene set by retaining genes strongly connected by biological networks from diverse lines of evidence. From multiple GWAS summary statistics of suicide attempt, a complex psychiatric phenotype, GRIN identified additional genes that replicated across independent cohorts and retained genes that were more biologically interrelated despite a relaxed significance threshold. We present a conceptual model of how these retained genes interact through neurobiological pathways to influence suicidal behavior and identify existing drugs associated with these pathways that would not have been identified under traditional GWAS thresholds. We demonstrate that GRIN is a useful community resource for improving the signal to noise ratio of GWAS results.
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