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Circadian clocks play conserved roles in gating sleep and wake states throughout the day-night cycle [1-5]. In the fruit fly Drosophila melanogaster, DN1p clock neurons have been reported to play both wake- and sleep-promoting roles [6-11], suggesting a complex coupling of DN1p neurons to downstream sleep and arousal centers. However, the circuit logic by which DN1p neurons modulate sleep remains poorly understood. Here, we show that DN1p neurons can be divided into two morphologically distinct subsets. Projections from one subset surround the pars intercerebralis, a previously defined circadian output region [12]. In contrast, the second subset also sends presynaptic termini to a visual processing center, the anterior optic tubercle (AOTU) [13]. Within the AOTU, we find that DN1p neurons inhibit a class of tubercular-bulbar (TuBu) neurons that act to promote consolidated sleep. These TuBu neurons in turn form synaptic connections with R neurons of the ellipsoid body, a region linked to visual feature detection, locomotion, spatial memory, and sleep homeostasis [14-17]. Our results define a second output arm from DN1p neurons and suggest a role for TuBu neurons as regulators of sleep drive.
Pubmed ID: 30270186 RIS Download
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