Aromatic l-amino acid decarboxylase (AADC) deficiency is a rare genetic disorder of neurotransmitter biosynthesis resulting from pathogenic variants in the dopa decarboxylase gene (OMIM #608,643) [1] encoding the AADC enzyme [2] (EC 4.1.1.28) [3, 4]. Here, DDC is linked to hereditary disease.