Depressive Disorder GWAS studies (Sullivan et al. 2009; Wray et al. 2010). Affymetrix 6.0, Affymetrix Perlegen 5.0, Illumina 370, Illumina 660 and Illumina Omni Express 1M platforms were used. Following exclusions based on standard QC (see Psychiatric Genetics Network 2009), data were merged and imputed against the reference set using IMPUTE v2. After imputation, genotype dosage was calculated if the highest genotype probability was above 90%.
