|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Han, B, Pouget, JG, Slowikowski, K, Stahl, E, Lee, CH, Diogo, D, Hu, X, Park, YR, Kim, E, Gregersen, PK, Dahlqvist, SR, Worthington, J, Martin, J, Eyre, S, Klareskog, L, Huizinga, T, Chen, WM, Onengut-Gumuscu, S, Rich, SS, Major Depressive Disorder Working Group of the Psychiatric Genomics, C, Wray, NR, Raychaudhuri, S|
There is growing evidence of shared risk alleles for complex traits (pleiotropy), including autoimmune and neuropsychiatric diseases. This might be due to sharing among all individuals (whole-group pleiotropy) or a subset of individuals in a genetically heterogeneous cohort (subgroup heterogeneity). Here we describe the use of a well-powered statistic, BUHMBOX, to distinguish between those two situations using genotype data. We observed a shared genetic basis for 11 autoimmune diseases and type 1 diabetes (T1D; P < 1 × 10(-4)) and for 11 autoimmune diseases and rheumatoid arthritis (RA; P < 1 × 10(-3)). This sharing was not explained by subgroup heterogeneity (corrected PBUHMBOX > 0.2; 6,670 T1D cases and 7,279 RA cases). Genetic sharing between seronegative and seropostive RA (P < 1 × 10(-9)) had significant evidence of subgroup heterogeneity, suggesting a subgroup of seropositive-like cases within seronegative cases (PBUHMBOX = 0.008; 2,406 seronegative RA cases). We also observed a shared genetic basis for major depressive disorder (MDD) and schizophrenia (P < 1 × 10(-4)) that was not explained by subgroup heterogeneity (PBUHMBOX = 0.28; 9,238 MDD cases).