Similarly, postmortem and clinical studies have revealed reduced BDNF expression in the brain and peripheral blood of suicide completers and patients with mood disorders, suggesting that reduction in BDNF expression may contribute to these phenotypes (Cunha et al., 2006, Dwivedi et al., 2003, Thompson Ray et al., 2011, Kim et al., 2007). This evidence concerns the gene BDNF and mood disorder.