Perhaps providing an explanation for the high prevalence (22%) of anemia among patients with major depressive disorder (MDD) [63], a meta-analysis of GWAS data strongly suggested that SCL25A37 mitoferrin-1 is also a risk gene for MDD [64] and is downregulated in the hippocampus and peripheral blood of patients with MDD. The gene discussed is SLC25A37; the disease is major depressive disorder.