title: Narcolepsy in orexin knockout mice: molecular genetics of sleep regulation.
abstract: Neurons containing the neuropeptide orexin (hypocretin) are located exclusively in the lateral hypothalamus and send axons to numerous regions throughout the central nervous system, including the major nuclei implicated in sleep regulation. Here, we report that, by behavioral and electroencephalographic criteria, orexin knockout mice exhibit a phenotype strikingly similar to human narcolepsy patients, as well as canarc-1 mutant dogs, the only known monogenic model of narcolepsy. Moreover, modafinil, an anti-narcoleptic drug with ill-defined mechanisms of action, activates orexin-containing neurons. We propose that orexin regulates sleep/wakefulness states, and that orexin knockout mice are a model of human narcolepsy, a disorder characterized primarily by rapid eye movement (REM) sleep dysregulation.
authors.affiliation: Howard Hughes Medical Institute, Department of Molecular Genetics, University of Texas Southwestern Medical Center at Dallas, 75235-9050, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Chemelli
authors.forename: J T
authors.initials: JT
authors.lastname: Willie
authors.forename: C M
authors.initials: CM
authors.lastname: Sinton
authors.forename: J K
authors.initials: JK
authors.lastname: Elmquist
authors.forename: T
authors.initials: T
authors.lastname: Scammell
authors.forename: C
authors.initials: C
authors.lastname: Lee
authors.forename: J A
authors.initials: JA
authors.lastname: Richardson
authors.forename: S C
authors.initials: SC
authors.lastname: Williams
authors.forename: Y
authors.initials: Y
authors.lastname: Xiong
authors.forename: Y
authors.initials: Y
authors.lastname: Kisanuki
authors.forename: T E
authors.initials: TE
authors.lastname: Fitch
authors.forename: M
authors.initials: M
authors.lastname: Nakazato
authors.forename: R E
authors.initials: RE
authors.lastname: Hammer
authors.forename: C B
authors.initials: CB
authors.lastname: Saper
authors.forename: M
authors.initials: M
authors.lastname: Yanagisawa
mesh_terms: D017668:Age of Onset; D000818:Animals; D001559:Benzhydryl Compounds / Q000494:pharmacology / Q000627:therapeutic use; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D004195:Disease Models, Animal; D004283:Dog Diseases / Q000235:genetics; D004285:Dogs; D004569:Electroencephalography; D004576:Electromyography; D006801:Humans; D007031:Hypothalamus / Q000187:drug effects / Q000503:physiopathology; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D000077408:Modafinil; D009290:Narcolepsy / Q000188:drug therapy / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology / Q000662:veterinary; D009474:Neurons / Q000187:drug effects / Q000473:pathology; D009479:Neuropeptides / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D064446:Orexin Receptors; D000068797:Orexins; D010641:Phenotype; D011187:Posture; D011498:Protein Precursors / Q000172:deficiency* / Q000235:genetics; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide / Q000172:deficiency / Q000235:genetics; D012890:Sleep / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D013045:Species Specificity; D013239:Stereotyped Behavior
chemical_list: D001559:Benzhydryl Compounds; D002352:Carrier Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009479:Neuropeptides; D064446:Orexin Receptors; D000068797:Orexins; D011498:Protein Precursors; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide; D000077408:Modafinil