Background Schizophrenia patients are at higher risk of engaging in violent behaviours than the general population. Schizophrenia is also regarded as a highly heritable disorder, and in 2014, a large genetic study by the Schizophrenia Working Group (SWG) of the Psychiatric Genomics Consortium (PGC) identified 108 risk loci for SCZ. The relationship between violence and these risk loci has not been studied, neither has there been any GWAS where Single-Nucleotide Polymorphisms (SNPs) were correlated with violence. This study aims to analyze the specific effect of genome-wide significant schizophrenia SNPs on violence in schizophrenia. Methods We recruited 87 subjects between the age of 18 to 75 from the Centre for Addiction and Mental Health (CAMH), who had a diagnosis of schizophrenia or schizoaffective disorder. We recorded physical violence scores indicating any violent actions to inflict pain, bodily harm, or death on another individual from the standardized scale, Modified Overt Aggression Scale (MOAS). We genotyped 2.5 million SNPs for each participant, and the DNA was analyzed using the whole genome analysis tool-set, PLINK. Results We found 13 SNPs which were associated with violence, and the highest correlation was with the SNP kgp11155273 on chromosome 10 (p=2.051E-7). Discussion This study found an association between violence and the kgp11155273 SNP on chromosome 10. Further studies using larger subject pools are required to probe further into the nature of this association, and determine the genetic basis of violence in schizophrenia.
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