The C allele of rs3806843 (increased risk for MDD and protective against SCZ) upregulated the expression of PCDHA1 in the cerebellum (NES = 0.56, p = 4.0 × 10−15) as well as the expression of PCDHA13 in the cerebellar hemisphere (NES = 0.55, p = 2.9 × 10−14) and the entire cortex (NES = 0.53, p = 2.2 × 10−12). The gene discussed is PCDHA1; the disease is major depressive disorder.