The MAOA single nucleotide polymorphisms (SNPs) rs1137070 (T/C, exonic, in high linkage disequilibrium with rs2064070 (A/T, downstream variant)) and rs6323 (G/T, exonic) have been associated with depression [12, 13] and suicidal symptoms [14], respectively. This evidence concerns the gene MAOA and depressive symptom measurement.