The dopamine transporter is a protein responsible for transporting dopamine, a neurotransmitter, from the synapse back into the presynaptic neuron. This process is important for regulating dopamine levels in the brain and proper functioning of the dopamine signaling system. Dysregulation of the dopamine transporter has been implicated in various neurological and psychiatric disorders, including Parkinson's disease, attention deficit hyperactivity disorder (ADHD), and substance abuse. Research on the dopamine transporter involves studying its structure, function, regulation, and potential therapeutic targeting for various disorders.