DRD2 and psychiatric disorder: Several published articles have identified the A1 allele of the DRD2 Taq1A polymorphism as a potential risk factor for various psychiatric disorders (Cordeiro and Vallada, 2014; Cai et al., 2015; Sukasem et al., 2016; Roy et al., 2018; Alfimova et al., 2019; Chiang et al., 2020; Ohira et al., 2022).