![]() 4 As such, suicide is currently considered a major public health challenge, 5 which has spurred research into its etiology and clinical prediction. 3 Suicide is now ranked the second leading cause of death for all persons 15–24 years old in the United States. 1 The estimated annual age-adjusted suicide death prevalence rate is approximately 0.014% in the United States, 2 and this rate has been steadily increasing since 2000. Suicide death is a behavioral event which reflects a complex, heritable phenotype with diverse clinical antecedents and environmental risk factors. Additionally, the suicide death sample was found to have increased genetic risk for behavioral disinhibition, major depressive disorder, depressive symptoms, autism spectrum disorder, psychosis, and alcohol use disorder compared with the control sample. Polygenic scores for several other psychiatric disorders and psychological traits were also predictive, particularly scores for behavioral disinhibition and major depressive disorder.ConclusionsMultiple genome-wide significant loci and genes were identified and polygenic score prediction of suicide death case-control status was demonstrated, adjusting for ancestry, in independent training and test sets. Notably, suicide polygenic scores were significantly predictive across training and test sets. Gene-based analyses implicated 22 genes on chromosomes 13, 15, 16, 17, and 19 (q2SNP value of 0.25 (SE=0.04) and a value of 0.16 (SE=0.02) when converted to a liability scale. ![]() Analytical methods included principal component analysis for ancestral matching and adjusting for population stratification, linear mixed model genome-wide association testing (conditional on genetic-relatedness matrix), gene and gene set-enrichment testing, and polygenic score analyses, as well as single-nucleotide polymorphism (SNP) heritability and genetic correlation estimation using linkage disequilibrium score regression.ResultsGenome-wide association analysis identified two genome-wide significant loci (involving six SNPs: rs34399104, rs35518298, rs34053895, rs66828456, rs35502061, and rs35256367). To address this limitation, the authors conducted the first comprehensive genomic analysis of suicide death using previously unpublished genotype data from a large population-ascertained cohort.MethodsThe analysis sample comprised 3,413 population-ascertained case subjects of European ancestry and 14,810 ancestrally matched control subjects. To date, there has been a lack of adequately powered genomic studies of suicide, with no sizable suicide death cohorts available for analysis. ObjectiveDeath by suicide is a highly preventable yet growing worldwide health crisis.
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