title: Developmental regulation of neural map formation in the mouse olfactory system.
abstract: In the mouse olfactory system, various odorants are detected by approximately 1000 different odorant receptors (ORs) expressed in the olfactory sensory neurons (OSNs). It is well established that each OSN expresses only one functional OR gene in a monoallelic manner. Furthermore, OSN axons expressing the same OR converge to a set of glomeruli in the olfactory bulb (OB). During embryonic development, a coarse map is formed by the combination of two genetically programmed processes. One is OR-independent axonal projection along the dorsal-ventral (D-V) axis, and the other is OR-dependent projection along the anterior-posterior (A-P) axis. D-V projection is regulated by the anatomical location of OSNs within the olfactory epithelium (OE), whereas A-P projection is instructed by expressed OR molecules using cyclic adenosine monophosphate (cAMP) signals. After birth, the map is further refined in an activity-dependent manner by its conversion from a continuous to a discrete map through segregation of glomerular structures. Here, we summarize recent progress from our laboratory in understanding neural map formation in the mouse olfactory system.
authors: Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan.
authors: Hirofumi
authors: H
authors: Nishizumi
authors: Department of Brain Function, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan.
authors: Hitoshi
authors: H
authors: Sakano
mesh_terms: D000818:Animals; D001369:Axons; D001931:Brain Mapping; D051379:Mice; D009154:Mutation / Q000235:genetics; D009833:Olfactory Pathways / Q000166:cytology* / Q000254:growth & development*; D018034:Olfactory Receptor Neurons / Q000502:physiology*; D043562:Receptors, G-Protein-Coupled / Q000235:genetics / Q000378:metabolism; D018035:Receptors, Odorant / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D043562:Receptors, G-Protein-Coupled; D018035:Receptors, Odorant
keywords: axonal projection; cyclic AMP; neural map; odorant receptors; olfactory sensory neurons; receptor baseline activity