Among the genes involved in dopaminergic function affected by HS were DDC, PHOX2A, TH, DBH and ADCY1. In addition, two potassium channel encoding genes, KCNH1 and KCND1, increased with HS, while the ASD and BD candidate gene DPP10 decreased; DPP10 codes for a dipeptidyl peptidase that regulates potassium channel function [116], [117], [142]. Here, DDC is linked to Behcet disease.