Entrainment and coupling of the hamster suprachiasmatic clock by daily dark pulses

Mendoza, Jorge; Pévet, Paul; Challet, Étienne

doi:10.1002/jnr.21887

Cited by 2 publications

(2 citation statements)

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“…The predominant role of E cells on CP rhythms implies that summer days are suitable for reproduction in D. melanogaster. Furthermore, the two-oscillator model explains adaptation to seasonal changes in day length even in mammals and suggests that such clock networks in the brain are common between Drosophila and mammals (Rieger et al 2006;Stoleru et al 2007;Mendoza et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Evening circadian oscillator as the primary determinant of rhythmic motivation for Drosophila courtship behavior

et al. 2010

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Circadian clocks of Drosophila melanogaster motivate males to court females at a specific time of day. However, clock neurons involved in courtship rhythms in the brain of Drosophila remain totally unknown. The circadian locomotor behavior of Drosophila is controlled by morning (M cells) and evening (E cells) cells in the brain, which regulate morning and evening activities, respectively. Here, we identified the brain clock neurons that are responsible for the circadian rhythms of the close-proximity (CP) behavior that reflects male courtship motivation. Interestingly, the ablation or functional molecular clock disruption of E cells caused arrhythmic CP behavior, but that of M cells resulted in sustained CP rhythms even in constant darkness. In addition, the ablation of some dorsal lateral neurons (LNd) of E cells using neuropeptide-F (NPF)-GAL4 did not impair CP rhythms. These findings suggested that the NPF-negative LNds and DN1s of E cells include cells essential for circadian CP behavior in Drosophila.

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Section: Discussionmentioning

confidence: 99%

Evening circadian oscillator as the primary determinant of rhythmic motivation for Drosophila courtship behavior

et al. 2010

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“…Splitting is caused by the left and right halves of the SCN which oscillate in antiphase to each other (Mendoza et al 2009;Tavakoli-Nezhad and Schwartz 2005). Arrhythmicity results, if the neurons within the SCN decouple from each other.…”

Section: Scn and Its Networkmentioning

confidence: 99%

How Light Resets Circadian Clocks

2014

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The daily revolutions of the earth around its axis are responsible for day and night and its annual orbit around the sun for the seasons with their fluctuations in day length. Most organisms have adapted to these diurnal and annual cycles. The strategies and mechanisms used are quite delicate and complicated.It came as a surprise that photosynthesis and many other processes are, however, additionally controlled by internal clocks. Thus, photosynthesis fluctuates not only during the daily light-dark cycle (=LD; see the List of Abbreviations and http://www.circadian.org/dictionary.html) but also when the plants are kept under LL and constant temperature (Hennessey and Field 1991). However, the period length (period for short) of this rhythmic event then deviates from exactly 24 h and is therefore called circadian (from Latin circa, about, and dies, day). If in the absence of LD and temperature cycles other 24 h time cues (also called zeitgeber, German for time giver) would control the rhythm, it should show an exact 24 h rhythm. This is not the case, demonstrating the endogenous nature of a clock that is locked to light signals (see Fig. 18.1). Spectrum of RhythmsEndogenous rhythms of organisms are not only tuned to the daily cycle of 24 h. The range of rhythms found in organisms covers ultradian (with periods of several hours to very short ones), circadian, and annual (with periods of about a year) rhythms. Other rhythms such as tidal, 14-day, and monthly ones cope with influences of the moon on the earth, mainly on the water movements of the oceans, and they are therefore found in organisms at the coasts and in the sea. Annual rhythms interact with the day-length changes during the year (see below). There are furthermore rhythms with periods covering several years. The following discussion of a "biological clock" is restricted to circadian rhythms. Even they are often not just composed of one clock type but form a "circadian system" consisting of two or more clocks with different prop- Function of Circadian ClocksThe term "clock" usually implies a time-measuring device or function. For instance, the day length (or night length) can be determined by an organism. Since day length is a function of the time of the year (long days in summer, short days in winter), it can be used to time certain events such as flowering or tuber formation of a plant or breeding of birds and mammals during the most appropriate season. These processes are denoted photoperiodism (see Chap. 19).However, a clock can also be used to set a certain temporal order. For instance, the circadian control of our sleepwake cycle ensures that we rise in the morning and fall asleep in the evening at a preferred time. Food intake and digestion are likewise controlled by this clock and gated to certain times of the day (Silver et al. 2011;Duguay and Cermakian 2009;Forsgren 1935). The circadian clock will time these events also under constant conditions. Furthermore, circadian clocks can serve as alarm clocks.

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Entrainment and coupling of the hamster suprachiasmatic clock by daily dark pulses

Cited by 2 publications

References 48 publications

Evening circadian oscillator as the primary determinant of rhythmic motivation for Drosophila courtship behavior

Evening circadian oscillator as the primary determinant of rhythmic motivation for Drosophila courtship behavior

How Light Resets Circadian Clocks

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