Journal
JOURNAL OF NEUROSCIENCE
Volume 39, Issue 9, Pages 1621-1630Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1497-18.2018
Keywords
circadian clock; Drosophila; photoreceptor
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Funding
- Howard Hughes Medical Institute
- German Research Foundation (DFG) [SFB1047]
- Hanns-Seidel Excellence Grant - Federal Ministry of Education and Research
- DFG [SCHL2135 1/1]
- National Institutes of Health [P40OD018537]
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To provide organisms with a fitness advantage, circadian clocks have to react appropriately to changes in their environment. High intensity (HI) light plays an essential role in the adaptation to hot summer days, which especially endanger insects of desiccation or prey visibility. Here, we show that solely increasing light intensity leads to an increased midday siesta in Drosophila behavior. Interestingly, this change is independent of the fly's circadian photoreceptor cryptochrome and is solely caused by a small visual organ, the Hofbauer-Buchner eyelets. Using receptor knock-downs, immunostaining, and recently developed calcium tools, we show that the eyelets activate key core clock neurons, namely the s-LN(v)s, at HI. This activation delays the decrease of PERIOD (PER) in the middle of the day and propagates to downstream target clock neurons that prolong the siesta. We show a new pathway for integrating light-intensity information into the clock network, suggesting new network properties and surprising parallels between Drosophila and the mammalian system.
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