Dopamine receptor D3

D₃ dopamine receptor is a protein that in humans is encoded by the DRD3 gene.

This gene encodes the D₃ subtype of the dopamine receptor. The D₃ subtype inhibits adenylyl cyclase through inhibitory G-proteins. This receptor is expressed in phylogenetically older regions of the brain, suggesting that this receptor plays a role in cognitive and emotional functions. It is a target for drugs which treat schizophrenia, drug addiction, and Parkinson's disease. Alternative splicing of this gene results in multiple transcript variants that would encode different isoforms, although some variants may be subject to nonsense-mediated decay (NMD).