PUBLICATION
Hypocretin/orexin overexpression induces an insomnia-like phenotype in zebrafish
- Authors
- Prober, D.A., Rihel, J., Onah, A.A., Sung, R.J., and Schier, A.F.
- ID
- ZDB-PUB-061229-18
- Date
- 2006
- Source
- The Journal of neuroscience : the official journal of the Society for Neuroscience 26(51): 13400-13410 (Journal)
- Registered Authors
- Prober, David, Rihel, Jason, Schier, Alexander
- Keywords
- hypocretin, orexin, sleep, insomnia, circadian rhythm, zebrafish
- MeSH Terms
-
- Animals
- Circadian Rhythm/genetics
- Gene Expression Regulation/physiology
- Intracellular Signaling Peptides and Proteins/genetics*
- Intracellular Signaling Peptides and Proteins/physiology
- Motor Activity/genetics
- Neuropeptides/biosynthesis*
- Neuropeptides/genetics*
- Neuropeptides/physiology
- Orexins
- Phenotype*
- Sleep/genetics
- Sleep Initiation and Maintenance Disorders/genetics*
- Sleep Initiation and Maintenance Disorders/metabolism*
- Zebrafish
- Zebrafish Proteins/biosynthesis*
- Zebrafish Proteins/genetics*
- Zebrafish Proteins/physiology
- PubMed
- 17182791 Full text @ J. Neurosci.
Citation
Prober, D.A., Rihel, J., Onah, A.A., Sung, R.J., and Schier, A.F. (2006) Hypocretin/orexin overexpression induces an insomnia-like phenotype in zebrafish. The Journal of neuroscience : the official journal of the Society for Neuroscience. 26(51):13400-13410.
Abstract
As many as 10% of humans suffer chronic sleep disturbances, yet the genetic mechanisms that regulate sleep remain essentially unknown. It is therefore crucial to develop simple and cost-effective vertebrate models to study the genetic regulation of sleep. The best characterized mammalian sleep/wake regulator is hypocretin/orexin (Hcrt), whose loss results in the sleep disorder narcolepsy and that has also been implicated in feeding behavior, energy homeostasis, thermoregulation, reward seeking, addiction, and maternal behavior. Here we report that the expression pattern and axonal projections of embryonic and larval zebrafish Hcrt neurons are strikingly similar to those in mammals. We show that zebrafish larvae exhibit robust locomotive sleep/wake behaviors as early as the fifth day of development and that Hcrt overexpression promotes and consolidates wakefulness and inhibits rest. Similar to humans with insomnia, Hcrt-overexpressing larvae are hyperaroused and have dramatically reduced abilities to initiate and maintain rest at night. Remarkably, Hcrt function is modulated by but does not require normal circadian oscillations in locomotor activity. Our zebrafish model of Hcrt overexpression indicates that the ancestral function of Hcrt is to promote locomotion and inhibit rest and will facilitate the discovery of neural circuits, genes, and drugs that regulate Hcrt function and sleep.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping