Enables G protein-coupled serotonin receptor activity and neurotransmitter receptor activity. Involved in several processes, including adenylate cyclase-activating serotonin receptor signaling pathway; detection of mechanical stimulus involved in sensory perception of pain; and modulation of chemical synaptic transmission. Located in several cellular components, including neuronal cell body; rough endoplasmic reticulum; and synaptic vesicle. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Used to study amnestic disorder; anxiety disorder; childhood absence epilepsy; cognitive disorder; and migraine. Biomarker of irritable bowel syndrome. Human ortholog(s) of this gene implicated in alcohol use disorder. Orthologous to human HTR7 (5-hydroxytryptamine receptor 7). [provided by Alliance of Genome Resources, Apr 2022]