1. Contribution of Rare Copy Number Variants to Bipolar Disorder Risk Is Limited to Schizoaffective Cases.
- Author
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Charney AW, Stahl EA, Green EK, Chen CY, Moran JL, Chambert K, Belliveau RA Jr, Forty L, Gordon-Smith K, Lee PH, Bromet EJ, Buckley PF, Escamilla MA, Fanous AH, Fochtmann LJ, Lehrer DS, Malaspina D, Marder SR, Morley CP, Nicolini H, Perkins DO, Rakofsky JJ, Rapaport MH, Medeiros H, Sobell JL, Backlund L, Bergen SE, Juréus A, Schalling M, Lichtenstein P, Knowles JA, Burdick KE, Jones I, Jones LA, Hultman CM, Perlis R, Purcell SM, McCarroll SA, Pato CN, Pato MT, Di Florio A, Craddock N, Landén M, Smoller JW, Ruderfer DM, and Sklar P
- Subjects
- Bipolar Disorder psychology, Case-Control Studies, Cohort Studies, Gene Duplication genetics, Genetic Predisposition to Disease, Genome-Wide Association Study, Humans, Multifactorial Inheritance, Psychotic Disorders psychology, Schizophrenia genetics, Bipolar Disorder genetics, DNA Copy Number Variations genetics, Psychotic Disorders genetics
- Abstract
Background: Genetic risk for bipolar disorder (BD) is conferred through many common alleles, while a role for rare copy number variants (CNVs) is less clear. Subtypes of BD including schizoaffective disorder bipolar type (SAB), bipolar I disorder (BD I), and bipolar II disorder (BD II) differ according to the prominence and timing of psychosis, mania, and depression. The genetic factors contributing to the combination of symptoms among these subtypes are poorly understood., Methods: Rare large CNVs were analyzed in 6353 BD cases (3833 BD I [2676 with psychosis, 850 without psychosis, and 307 with unknown psychosis history], 1436 BD II, 579 SAB, and 505 BD not otherwise specified) and 8656 controls. CNV burden and a polygenic risk score (PRS) for schizophrenia were used to evaluate the relative contributions of rare and common variants to risk of BD, BD subtypes, and psychosis., Results: CNV burden did not differ between BD and controls when treated as a single diagnostic entity. However, burden in SAB was increased relative to controls (p = .001), BD I (p = .0003), and BD II (p = .0007). Burden and schizophrenia PRSs were increased in SAB compared with BD I with psychosis (CNV p = .0007, PRS p = .004), and BD I without psychosis (CNV p = .0004, PRS p = 3.9 × 10
-5 ). Within BD I, psychosis was associated with increased schizophrenia PRSs (p = .005) but not CNV burden., Conclusions: CNV burden in BD is limited to SAB. Rare and common genetic variants may contribute differently to risk for psychosis and perhaps other classes of psychiatric symptoms., (Copyright © 2019 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.)- Published
- 2019
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