TitleMolecular mechanism and cellular distribution of insect circadian clocks
Publication TypeJournal Article
Year of Publication2000
AuthorsGiebultowicz, J
JournalAnnual Review of Entomology
Volume45
Pagination769-793
Type of ArticleJournal Article
ISSN0066-4170
Abstract

Circadian clocks are endogenous timing mechanisms that control molecular, cellular, physiological, and behavioral rhythms in all organisms from unicellulars to humans. Circadian rhythms influence many aspects of insect biology, fine-tuning life functions to the light and temperature cycles associated with the solar day. Genetic studies in the fruit fly Drosophila melanogaster have led to the cloning and characterization of several genes involved in the mechanism of the circadian clock. Periodic transcription and translation of these clock genes form the basis of a molecular feedback loop that has a "circa" 24-hour period. Rhythmic expression of clock genes in specific brain neurons appears to control behavioral rhythms in adult flies. However, clock genes are also expressed in other tissues, both within and outside of the nervous system. These observations prompted chronobiologists to investigate whether nonneural tissues possess intrinsic circadian clocks, what role they may be playing, and what the relationships are between clocks in the nervous system and those in peripheral tissues. Answers to those questions are providing important insights into the overall organization of the circadian system in insects.

URL<Go to ISI>://WOS:000086173900029
DOI10.1146/annurev.ento.45.1.769