Data from the Utah Suicide Genetic Risk Study (USGRS) biobank showed that among the sample of 2,672 suicide deaths, compared to non-suicide deaths, both PER1 (Period Circadian Regulator 1) and SNAPC1 (Small Nuclear RNA Activating Complex Polypeptide 1) genes show evidence of suicide risk in bipolar disorder and schizophrenia [37]. Here, PER1 is linked to schizophrenia.