Utilizing summary statistics from PTSD and MDD GWASs (Wray et al., 2018; Maihofer et al., submitted), we identified four genes (UBA7, HLA-F, HSPA1B, and RERE) with high probability of a shared causal eQTL variant with PTSD and/or MDD GWAS variants, thereby providing a potential mechanism by which the GWAS variant contributes to disease risk. This evidence concerns the gene RERE and major depressive disorder.