Importantly, DAT genetic hypofunction in mice produced alterations consistent with ADHD, but not with schizophrenia or bipolar disorders (Mereu et al., 2017) in one study, but it was shown in another study that DAT silencing in the rat produces abnormalities in the prefrontal-midbrain and in striato-cerebellar circuits leading to motor hyperactivity and compulsive-like behaviors applicable for ADHD, schizophrenia, and obsessive-compulsive disorder (Reinwald et al., 2022). This evidence concerns the gene SLC6A3 and obsessive-compulsive disorder.