Therefore, it can be speculated that miR-25 and its downstream signaling pathways might be regulated by the serotoninergic and dopaminergic systems, in particular, the 5-HT2 and dopamine D2 receptor, which might also explain the association of miR-25 and other neuropsychiatric diseases that are related to the serotoninergic and dopaminergic systems (e.g., epilepsy and Parkinson’s disease). The gene discussed is HTR2A; the disease is Parkinson disease.