Egg-laying rhythm in Drosophila melanogaster

Jan 17, 2009Journal of genetics

Daily patterns of egg-laying behavior in fruit flies

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Abstract

The circadian egg-laying rhythm in Drosophila melanogaster exhibits a free-running period longer than that of most other rhythms.

Circadian clocks in organisms regulate various physiological processes, including metabolic functions.
In Drosophila melanogaster, distinct neuronal subgroups manage different circadian behavioral rhythms.
The egg-laying rhythm is rhythmic even under constant light conditions, indicating unique regulatory mechanisms.
The underlying clock genes and neurons for the egg-laying rhythm are not well understood compared to those for other rhythms.

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Extensive research has been carried out to understand how circadian clocks regulate various physiological processes in organisms. The discovery of clock genes and the molecular clockwork has helped researchers to understand the possible role of these genes in regulating various metabolic processes. In Drosophila melanogaster, many studies have shown that the basic architecture of circadian clocks is multi-oscillatory. In nature, different neuronal subgroups in the brain of D. melanogaster have been demonstrated to control different circadian behavioural rhythms or different aspects of the same circadian rhythm. Among the circadian phenomena that have been studied so far in Drosophila, the egg-laying rhythm is unique, and relatively less explored. Unlike most other circadian rhythms, the egg-laying rhythm is rhythmic under constant light conditions, and the endogenous or free-running period of the rhythm is greater than those of most other rhythms. Although the clock genes and neurons required for the persistence of adult emergence and activity/rest rhythms have been studied extensively, those underlying the circadian egg-laying rhythm still remain largely unknown. In this review, we discuss our current understanding of the circadian egg-laying rhythm in D. melanogaster, and the possible molecular and physiological mechanisms that control the rhythmic output of the egg-laying process.

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Egg-laying rhythm in Drosophila melanogaster

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