Risk genotype and diagnosis predict PCDH9 expression. (a) Association of rs9540720 with PCDH9 mRNA expression in the 152 adult subjects from frontal cortex in the BrainCloud data set (Colantuoni et al, 2011). Number of individuals: GG, N=24; GA, N=75; AA, N=53. (b) Diagnostic analysis of PCDH9 expression in adult samples from frontal cortex in dbGaP using microarray data. MDD, major depressive disorder. Number of individuals: MDD, N=131; Control, N=103. (c) Diagnostic analysis of PCDH9 expression in the frontal cortex and hippocampus of adult samples from Stanley center using RNA-seq data. N=15 in each group.