1. Evidence for genetic heterogeneity between clinical subtypes of bipolar disorder.
- Author
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Charney, AW, Ruderfer, DM, Stahl, EA, Moran, JL, Chambert, K, Belliveau, RA, Forty, L, Gordon-Smith, K, Di Florio, A, 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, Green, EK, Backlund, L, Bergen, SE, Juréus, A, Schalling, M, Lichtenstein, P, Roussos, P, Knowles, JA, Jones, I, Jones, LA, Hultman, CM, Perlis, RH, Purcell, SM, McCarroll, SA, Pato, CN, Pato, MT, Craddock, N, Landén, M, Smoller, JW, and Sklar, P
- Subjects
Chromosomes ,Human ,Pair 10 ,Humans ,Aminopeptidases ,Ankyrins ,Calmodulin-Binding Proteins ,Calcium Channels ,L-Type ,Cytoskeletal Proteins ,Nerve Tissue Proteins ,Nuclear Proteins ,Case-Control Studies ,Bipolar Disorder ,Psychotic Disorders ,Genotype ,Phenotype ,Polymorphism ,Single Nucleotide ,Genome-Wide Association Study ,Chromosomes ,Human ,Pair 10 ,Calcium Channels ,L-Type ,Polymorphism ,Single Nucleotide ,Clinical Sciences ,Public Health and Health Services ,Psychology - Abstract
We performed a genome-wide association study of 6447 bipolar disorder (BD) cases and 12 639 controls from the International Cohort Collection for Bipolar Disorder (ICCBD). Meta-analysis was performed with prior results from the Psychiatric Genomics Consortium Bipolar Disorder Working Group for a combined sample of 13 902 cases and 19 279 controls. We identified eight genome-wide significant, associated regions, including a novel associated region on chromosome 10 (rs10884920; P=3.28 × 10-8) that includes the brain-enriched cytoskeleton protein adducin 3 (ADD3), a non-coding RNA, and a neuropeptide-specific aminopeptidase P (XPNPEP1). Our large sample size allowed us to test the heritability and genetic correlation of BD subtypes and investigate their genetic overlap with schizophrenia and major depressive disorder. We found a significant difference in heritability of the two most common forms of BD (BD I SNP-h2=0.35; BD II SNP-h2=0.25; P=0.02). The genetic correlation between BD I and BD II was 0.78, whereas the genetic correlation was 0.97 when BD cohorts containing both types were compared. In addition, we demonstrated a significantly greater load of polygenic risk alleles for schizophrenia and BD in patients with BD I compared with patients with BD II, and a greater load of schizophrenia risk alleles in patients with the bipolar type of schizoaffective disorder compared with patients with either BD I or BD II. These results point to a partial difference in the genetic architecture of BD subtypes as currently defined.
- Published
- 2017