Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 50, Pages 19587-19594Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0809577105
Keywords
circadian clock; diurnal; phase resetting; sleep/arousal; photoresponse
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Funding
- National Institutes of Health [P01 NS044232-06]
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The neural circuits that regulate sleep and arousal as well as their integration with circadian circuits remain unclear, especially in Drosophila. This issue intersects with that of photoreception, because light is both an arousal signal in diurnal animals and an entraining signal for the circadian clock. To identify neurons and circuits relevant to light-mediated arousal as well as circadian phase-shifting, we developed genetic techniques that link behavior to single cell-type resolution within the Drosophila central brain. We focused on the unknown function of the 10 PDF-containing large ventral lateral neurons (I-LNvs) of the Drosophila circadian brain network and show here that these cells function in light-dependent arousal. They also are important for phase shifting in the late-night (dawn), indicating that the circadian photoresponse is a network property and therefore non-cell-autonomous. The data further indicate that the circuits underlying light-induced arousal and circadian photoentrainment intersect at the I-LNvs and then segregate.
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