Dopamine transporter (DAT) (DAT)

The Dopamine transporter (DAT), encoded by the SLC6A3 gene, is a membrane-spanning protein primarily responsible for the reuptake of dopamine from the synaptic cleft into presynaptic neurons (UniProt: P23975). By clearing dopamine from the synapse, DAT serves as the principal regulator of the duration and intensity of dopaminergic neurotransmission, which is vital for motor control, motivation, and reward-seeking behavior (StatPearls: Physiology, Dopamine Transporter). Dysregulation of DAT expression or function is implicated in several neuropsychiatric conditions, most notably Attention-Deficit Hyperactivity Disorder (ADHD) and Parkinson's disease, where DAT density is often used as a diagnostic biomarker (PubMed: 24953830). Many pharmacological agents target DAT, including psychostimulants like methylphenidate and cocaine, which inhibit the transporter to increase extracellular dopamine levels (PubChem: CID 2771). However, the pairing of DAT with escitalopram is technically incorrect; escitalopram is a selective serotonin reuptake inhibitor (SSRI) with extremely high affinity for the serotonin transporter (SERT) but negligible affinity for DAT (Meyer et al., 2004). Therefore, while DAT is a significant therapeutic target, it is not the target through which escitalopram exerts its primary antidepressant effects.

Other names

SLC6A3Sodium-dependent dopamine transporterDAT1Solute carrier family 6 member 3

Inhibition of dopamine reuptake from the synaptic cleft into the presynaptic neuron, thereby increasing the concentration and duration of dopamine signaling (StatPearls: Physiology, Dopamine Transporter).