Receptor for dopamine. The activity of this receptor is mediated by G proteins which activate adenylyl cyclase. Might be involved in the processing of visual information and/or visual learning. Important for Pavlovian conditioning: required in the mushroom body as a receptor conveying unconditional stimuli information, has a role in memory formation for aversive and appetitive learning. Sleep-deprivation-induced impairments in learning can be partially explained through alterations in dopamine signaling, Dop1R1 expression levels are reduced; sleep may have a role in restoring dopamine homeostasis. Expressed in the larval and adult CNS in structures that mediate higher-order brain functions such as learning, memory and motor control: in the mushroom body neuropil and four unpaired neurons in each thoracic segment. The adult CNS has intense expression in the central complex, moderate expression in several neurosecretory cells, and weak expression in two unpaired neurons in the mesothoracic neuromere. Also seen in the somata of the optic lobes. Expressed both maternally and zygotically. Potency of neurotransmitter agonists in stimulating cAMP production and the lack of stimulation by other transmitters and metabolites suggests this is a D1-like receptor. Low homology to vertebrate D1 receptors suggests this may be a progenitor of the D1 receptor subfamily. Belongs to the G-protein coupled receptor 1 family.