A subset of dorsal neurons modulates circadian behavior and light responses in Drosophila.
A fundamental property of circadian rhythms is their ability to persist under constant conditions. In Drosophila, the ventral Lateral Neurons (LNvs) are the pacemaker neurons driving circadian behavior under constant darkness. Wild-type flies are arrhythmic under constant illumination, but flies defective for the circadian photoreceptor CRY remain rhythmic. We found that flies overexpressing the pacemaker gene per or the morgue gene are also behaviorally rhythmic under constant light. Unexpectedly, the LNvs do not drive these rhythms: they are molecularly arrhythmic, and PDF--the neuropeptide they secrete to synchronize behavioral rhythms under constant darkness--is dispensable for rhythmicity in constant light. Molecular circadian rhythms are only found in a group of Dorsal Neurons: the DN1s. Thus, a subset of Dorsal Neurons shares with the LNvs the ability to function as pacemakers for circadian behavior, and its importance is promoted by light.
Murad
Alejandro
A
Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA.
Emery-Le
Myai
M
Emery
Patrick
P
D000818:Animals; D030801:Animals, Genetically Modified; D002940:Circadian Rhythm / Q000502:physiology*; D056931:Cryptochromes; D003624:Darkness; D004330:Drosophila / Q000502:physiology*; D029721:Drosophila Proteins / Q000235:genetics* / Q000502:physiology; D005136:Eye Proteins / Q000235:genetics / Q000502:physiology; D008029:Lighting; D009474:Neurons / Q000502:physiology*; D009479:Neuropeptides / Q000235:genetics / Q000502:physiology; D009687:Nuclear Proteins / Q000235:genetics / Q000502:physiology; D056950:Period Circadian Proteins; D043562:Receptors, G-Protein-Coupled / Q000235:genetics / Q000502:physiology
D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D009479:Neuropeptides; D009687:Nuclear Proteins; C539040:PER protein, Drosophila; D056950:Period Circadian Proteins; D043562:Receptors, G-Protein-Coupled; C119828:cry protein, Drosophila; C460739:morgue protein, Drosophila; C113883:pdf protein, Drosophila; C096445:tim protein, Drosophila