Large-scale genome-wide association analysis of bipolar disorder identifies a new susceptibility locus near ODZ4

Sklar, Pamela and Ripke, Stephan and Scott, Laura J and Andreassen, Ole A and Cichon, Sven and Craddock, Nick and Edenberg, Howard J and Nurnberger, John I and Rietschel, Marcella and Blackwood, Douglas and Corvin, Aiden and Flickinger, Matthew and Guan, Weihua and Mattingsdal, Morten and McQuillin, Andrew and Kwan, Phoenix and Wienker, Thomas F and Daly, Mark and Dudbridge, Frank and Holmans, Peter A and Lin, Danyu and Burmeister, Margit and Greenwood, Tiffany A and Hamshere, Marian L and Muglia, Pierandrea and Smith, Erin N and Zandi, Peter P and Nievergelt, Caroline M and McKinney, Rebecca and Shilling, Paul D and Schork, Nicholas J and Bloss, Cinnamon S and Foroud, Tatiana and Koller, Daniel L and Gershon, Elliot S and Liu, Chunyu and Badner, Judith A and Scheftner, William A and Lawson, William B and Nwulia, Evaristus A and Hipolito, Maria and Coryell, William and Rice, John and Byerley, William and McMahon, Francis J and Schulze, Thomas G and Berrettini, Wade and Lohoff, Falk W and Pickard, Benjamin S and Gordon-Smith, Katherine, Psychiatric GWAS Consortium Bipolar Disorder Working Group (2011) Large-scale genome-wide association analysis of bipolar disorder identifies a new susceptibility locus near ODZ4. Nature Genetics, 43 (10). pp. 977-983.

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Abstract

We conducted a combined genome-wide association study (GWAS) of 7,481 individuals with bipolar disorder (cases) and 9,250 controls as part of the Psychiatric GWAS Consortium. Our replication study tested 34 SNPs in 4,496 independent cases with bipolar disorder and 42,422 independent controls and found that 18 of 34 SNPs had P <0.05, with 31 of 34 SNPs having signals with the same direction of effect (P = 3.8 × 10(-7)). An analysis of all 11,974 bipolar disorder cases and 51,792 controls confirmed genome-wide significant evidence of association for CACNA1C and identified a new intronic variant in ODZ4. We identified a pathway comprised of subunits of calcium channels enriched in bipolar disorder association intervals. Finally, a combined GWAS analysis of schizophrenia and bipolar disorder yielded strong association evidence for SNPs in CACNA1C and in the region of NEK4-ITIH1-ITIH3-ITIH4. Our replication results imply that increasing sample sizes in bipolar disorder will confirm many additional loci.