We showed that inherent anxiety at baseline and elevated expression of the mineralocorticoid receptors (MR) in the hippocampus predisposes to a stress-induced suppression of expression of metabotropic glutamate receptors-2 (mGlu2, a key inhibitor of spontaneous glutamate release) with development of depressive-like behavior via epigenetic mechanisms of histone acetylation [20]. The gene discussed is GRM2; the disease is Anxiety.