Planned comparisons for two GABAA receptor genes at 4p12 were made in relation to beta power. The results from the KGG GATES positional gene‐based analysis showed significant results for GABRA2 (p = .024) and GABRB1 (p = .15). After removing the results from the COGA sample—on which the previous findings were based—the p value increased to p = .052 for GABRA2, just missing the .05 mark. MetaXcan analysis, however, showed that imputed himppocampal expression of GABRA2 was significantly associated with beta power for hippocampal expression of GABRA2 (p = .0024). This effect remained significant after removal of the COGA samples (p = .0050). GABRA2 expression in other tissues was not significantly associated with beta power (p > .2).
