Over 10% of humans suffer chronic sleep disorders, but the genetic and neural mechanisms that regulate sleep are poorly understood. The identification of defective Hypocretin/Orexin (Hcrt) signaling as a cause of narcolepsy provided a genetic entry point into sleep research, but an effective treatment for this disorder has not yet been found. Moreover, only a small fraction of sleep disorders are associated with narcolepsy, indicating that additional genes and neurons that control sleep and wakefulness remain to be identified. The objective of this proposal is to use zebrafish as a simple and cost-effective vertebrate model system to study Hcrt signaling and sleep. Zebrafish are a useful model for these studies because they have the basic brain structures and genes that are thought to regulate mammalian sleep, but are also optically transparent and amenable to high-throughput behavior assays. The proposed research has three aims. First, we will characterize the development of larval zebrafish Hcrt neurons at the single neuron level and test hypotheses about their development. Second, we will use genetic and pharmacological approaches to determine which neurons are activated by Hcrt signaling and which neurotransmitter systems are required for Hcrt-induced wakefulness. Third, we will determine whether other sleep regulators, including adenosine, melatonin, and Kv3-type potassium channels, affect sleep via the Hcrt system. These experiments will improve our understanding of Hcrt neuron development and function, may provide clues to the basis of sleep disorders such as chronic insomnia, and may lead to novel therapies for these disorders.
Over 10% of humans suffer chronic sleep disorders, but the causes of most of these disorders are unknown. This proposal will use zebrafish to examine how sleep is regulated by studying a gene whose loss causes the human sleep disorder narcolepsy and may be involved in other sleep disorders. The proposed studies will improve understanding of the genetic and neuronal mechanisms that regulate sleep and may suggest new strategies to treat sleep disorders.
| Prober, David A (2018) Discovery of Hypocretin/Orexin Ushers in a New Era of Sleep Research. Trends Neurosci 41:70-72 |
| Nath, Ravi D; Bedbrook, Claire N; Abrams, Michael J et al. (2017) The Jellyfish Cassiopea Exhibits a Sleep-like State. Curr Biol 27:2984-2990.e3 |
| Chen, Audrey; Singh, Chanpreet; Oikonomou, Grigorios et al. (2017) Genetic Analysis of Histamine Signaling in Larval Zebrafish Sleep. eNeuro 4: |
| Oikonomou, Grigorios; Prober, David A (2017) Attacking sleep from a new angle: contributions from zebrafish. Curr Opin Neurobiol 44:80-88 |
| Chen, Shijia; Reichert, Sabine; Singh, Chanpreet et al. (2017) Light-Dependent Regulation of Sleep and Wake States by Prokineticin 2 in Zebrafish. Neuron 95:153-168.e6 |
| Singh, Chanpreet; Rihel, Jason; Prober, David A (2017) Neuropeptide Y Regulates Sleep by Modulating Noradrenergic Signaling. Curr Biol 27:3796-3811.e5 |
| Lee, Daniel A; Andreev, Andrey; Truong, Thai V et al. (2017) Genetic and neuronal regulation of sleep by neuropeptide VF. Elife 6: |
| Suarez-Bregua, Paula; Torres-Nuñez, Eva; Saxena, Ankur et al. (2017) Pth4, an ancient parathyroid hormone lost in eutherian mammals, reveals a new brain-to-bone signaling pathway. FASEB J 31:569-583 |
| Choi, Harry M T; Calvert, Colby R; Husain, Naeem et al. (2016) Mapping a multiplexed zoo of mRNA expression. Development 143:3632-3637 |
| Chen, Audrey; Chiu, Cindy N; Mosser, Eric A et al. (2016) QRFP and Its Receptors Regulate Locomotor Activity and Sleep in Zebrafish. J Neurosci 36:1823-40 |
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