This article discusses the role of odorant receptors (ORs) in the olfactory system, including their dual roles in detecting odorants in olfactory sensory neurons and guiding sensory axons to precise target locations in the brain, as well as recent findings on the mechanisms of activation and function of axonal ORs.
In the olfactory system, odorant receptors (ORs) expressed at the cell membrane of olfactory sensory neurons detect odorants and direct sensory axons toward precise target locations in the brain, reflected in the presence of olfactory sensory maps. This dual role of ORs is corroborated by their subcellular expression both in cilia, where they bind odorants, and at axon terminals, a location suitable for axon guidance cues. Here, we provide an overview and discuss previous work on the role of ORs in establishing the topographic organization of the olfactory system and recent findings on the mechanisms of activation and function of axonal ORs.
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