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Dopamine D4 Receptor (D4R)
- Target
- D4R
- Molecular classification
- G protein-coupled receptor, Receptor, GPCR, D2-like receptor
01
Overview
The dopamine D4 receptor (D4R) is a member of the dopamine receptor family and a D2-like G protein-coupled receptor (GPCR) encoded by the DRD4 gene. It is predominantly found in the prefrontal cortex and hippocampus, playing key roles in cognition, attention, impulsivity, and reward processing. Polymorphisms within DRD4 have been linked to several neuropsychiatric conditions, including ADHD, schizophrenia, and bipolar disorder. Selective ligands targeting this receptor subtype are being explored for potential therapeutic applications. Its structure and polymorphism inform rational drug design.
- Other names
- DRD4
02
Mechanism of action
Inhibition of adenylate cyclase via Gi/o proteins, leading to reduced intracellular cyclic AMP levels.
03
Biological functions
Signal transductionModulation of neuronal signalingRegulation of emotionCognitionAttentionReward processingModulation of excitatory neurotransmission
04
Disease associations
Attention-deficit hyperactivity disorder (ADHD)SchizophreniaBipolar disorderAddictive behaviors/substance use disordersParkinson’s diseaseEating disorders (anorexia nervosa)Restless legs syndromeBorderline personality disorder (possible association)
05
Safety considerations
Potential for motor side effects when targeting striatal dopaminergic systemsOff-target effects due to structural similarities with other dopamine receptorsAltered sensitivity to dopamine in individuals with certain DRD4 polymorphisms
06
Interacting drugs
Clozapine
2 more in the full profile.
07
Biomarkers
DRD4 VNTR polymorphisms (e.g., 7-repeat allele associated with ADHD)
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