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Identification of subsets of individuals that may demonstrate increased propensity for posttraumatic symptoms and who may share genetic vulnerabilities for gene\u2010environment interactions can enhance efforts to understand, predict, and prevent these phenomena. A sample of 11,489 cases from the Genomic Psychiatry Cohort (GPC), a NIMH\u2010managed data repository for the investigation of schizophrenia and bipolar disorder, was used for this study. Cases were excluded if TBI was deemed causal to their mental illness. A <jats:italic>k\u2010<\/jats:italic>means clustering algorithm was used to probe differences between schizophrenia and bipolar disorder associated with variables including onset age, hallucinations, delusions, head injury, and TBI. Cases were separated into an optimum number of seven clusters, with two clusters including all cases with brain injury. Bipolar disorder with psychosis and TBI were significantly correlated in one cluster in which 72% of cases were male and 99.2% sustained head injury. This cluster also carried the longest average period of unconsciousness. This study demonstrates an association of TBI with psychosis in a subset of bipolar cases, suggesting that traumatic stressors may have the ability to impact gene expression in a vulnerable population, and\/or there is a heightened occurrence of TBI in individuals with underlying psychosis. Further studies should more closely examine the interplay between genetic variation in bipolar disorder and susceptibility to psychosis following TBI. \u00a9 2015 Wiley Periodicals, Inc.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajmg.b.32350","type":"journal-article","created":{"date-parts":[[2015,7,30]],"date-time":"2015-07-30T03:37:39Z","timestamp":1438227459000},"page":"506-512","source":"Crossref","is-referenced-by-count":7,"title":["Traumatic brain injury and bipolar psychosis in the Genomic Psychiatry Cohort"],"prefix":"10.1002","volume":"171","author":[{"given":"Kristina","family":"Cieslak","sequence":"first","affiliation":[{"name":"Department of Psychiatry New York University School of Medicine, Social, and Psychiatric Initiative (InSPIRES) New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michelle","family":"Pato","sequence":"additional","affiliation":[{"name":"Department of Psychiatry Keck School of Medicine of USC Los Angeles California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Buckley","sequence":"additional","affiliation":[{"name":"Department of Psychiatry Medical College of Georgia at Georgia Reagents University Augusta Georgia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"Pato","sequence":"additional","affiliation":[{"name":"Department of Psychiatry Keck School of Medicine of USC Los Angeles California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Janet L.","family":"Sobell","sequence":"additional","affiliation":[{"name":"Department of Psychiatry Keck School of Medicine of USC Los Angeles California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helena","family":"Medeiros","sequence":"additional","affiliation":[{"name":"Department of Psychiatry Keck School of Medicine of USC Los Angeles California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Applied Mathematics and Statistics Stony Brook University Stony Brook New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hongshik","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Applied Mathematics and Statistics Stony Brook University Stony Brook New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"name":"Genomic Psychiatry Cohort Consortium","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dolores","family":"Malaspina","sequence":"additional","affiliation":[{"name":"Department of Psychiatry New York University School of Medicine, Social, and Psychiatric Initiative (InSPIRES) New York"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2015,7,29]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1001\/archpsyc.60.3.231"},{"key":"e_1_2_6_3_1","volume-title":"Diagnostic and statistical manual of mental disorders: DSM\u2010IV: International version with ICD\u201010 codes","author":"American Psychiatric Association. 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