Flexible clock systems: adjusting the temporal programme

Veen, Daan R. van der; Riede, Sjaak J.; Heideman, Paul D.; Hau, Michaela; Vinne, Vincent van der; Hut, Roelof A.

doi:10.1098/rstb.2016.0254

Cited by 53 publications

(39 citation statements)

References 192 publications

(245 reference statements)

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“…Thus, we tested the hypothesis that a unique clockwork is able to generate both circatidal and circadian rhythms. To test this hypothesis in ecological field conditions [37,38], we studied the ability of circadian core clock genes to oscillate at tidal frequency. The expression of core circadian clock genes and putative clock-associated genes (cags) was analysed in the same field location as the behavioural study.…”

Section: Discussionmentioning

confidence: 99%

Bivalve mollusc circadian clock genes can run at tidal frequency

et al. 2020

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Marine coastal habitats are complex cyclic environments as a result of sun and moon interactions. In contrast with the well-known circadian orchestration of the terrestrial animal rhythmicity (approx. 24 h), the mechanism responsible for the circatidal rhythm (approx. 12.4 h) remains largely elusive in marine organisms. We revealed in subtidal field conditions that the oyster Crassostrea gigas exhibits tidal rhythmicity of circadian clock genes and clock-associated genes. A free-running (FR) experiment showed an endogenous circatidal rhythm. In parallel, we showed in the field that oysters' valve behaviour exhibited a strong tidal rhythm combined with a daily rhythm. In the FR experiment, all behavioural rhythms were circatidal, and half of them were also circadian. Our results fuel the debate on endogenous circatidal mechanisms. In contrast with the current hypothesis on the existence of an independent tidal clock, we suggest that a single ‘circadian/circatidal’ clock in bivalves is sufficient to entrain behavioural patterns at tidal and daily frequencies.

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Section: Discussionmentioning

confidence: 99%

Bivalve mollusc circadian clock genes can run at tidal frequency

et al. 2020

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“…This issue is further confounded by complex temporal activity profiles in some species. For instance, the degu (Octodon degus), which can readily switch between different activity patterns depending on environmental conditions and the presence of a homecage running wheel [21], and recent reports of environmental niche switching in some primarily nocturnal species in response to environmental and metabolic factors, including the induction of locomotor activity [22,23]. Nonetheless, locomotor activity is certainly an effective Zeitgeber in diurnal species.…”

Section: Diurnal Mammals Circadian Clocks and Locomotor Activitymentioning

confidence: 99%

Locomotor exercise and circadian rhythms in mammals

Hughes

2018

Current Opinion in Physiology

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Hughes, ATLLocomotor exercise and circadian rhythms in mammals http://researchonline.ljmu.ac.uk/id/eprint/9098/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. AbstractThe timing of locomotor activity is a major rhythmic output of the mammalian circadian system but both spontaneous and induced exercise can also themselves impact on circadian rhythms across levels of organisation and in multiple tissues, including both the brain and periphery. This review briefly summarises historical research on the influences of locomotor activity and its correlates on circadian function and then discusses recent advances in this area. Locomotor exercise can acutely alter circadian phase, both of overt behavioural rhythms and in peripheral tissues, and can stably entrain rhythms in behaviour driven by the hypothalamic master circadian pacemaker in the suprachiasmatic nucleus (SCN). Locomotor activity potently and acutely suppresses both electrical activity and clock gene expression in the master circadian pacemaker of the hypothalamus, though mechanistically how this is achieved is still unclear, as are the effects of locomotor activity in diurnal species, including humans. HighlightsThe timing of locomotor activity is a major output of the mammalian circadian system.Locomotor exercise also impacts on circadian function, a so-called Zeitnehmer.Locomotor activity suppresses electrical firing and clock gene expression in the SCN Locomotor-circadian influences are poorly studied in diurnal species.Scheduled activity may stabilises aberrant circadian function.

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“…It is clearly known that there is a molecular and neuronal connection between circadian clock and human metabolism. Thus circadian rhythms operate almost every functions of the metabolism from sleep/wake to fasting/feeding behavior through control of the cellular and organic system [1][2][3]. Biological rhythm is not exclusive to human being.…”

Section: Circadian Rhythmsmentioning

confidence: 99%

Circadian Rhythm and Chronobiology

Çakmur¹

2018

Circadian Rhythm - Cellular and Molecular Mechanisms

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All photosensitive organisms have a biological clock to cope with daily and seasonal circle of the earth. Biological clocks create circadian rhythms and regulate their processing according to cycle of the world. Circadian rhythm is an autoregulatory system and commands almost every physiological, biological, and biochemical functions of the mammalians. Therefore, biological clocks operate rhythmically with a period for a day, and this phenomenon is called as circadian rhythm. The process ongoing approximately 24 h rhythm in accordance with the meaning of the word (circa (approx.) dies (1 day). The essential purpose of biological clocks (in other word the organism's innate timing device) is the adaptation of the living organism to environment. Circadian rhythms refer to changes in the organism's approximately 1 day's physiological, biochemical and biological processes. In a molecular level, there are thousands of biological clocks in the human body. The main clocks in the human brain coordinate all these cellular clocks. Thus, the rhythmical phenomenon works in a harmony with the master clock and solar cycle. However, the natural factors within the body produce circadian rhythms the environment cues also affect them. The light is the main cue that affects biological rhythm. These light-dark cycles can control of the molecular structure of biological clocks. Changing the light-dark cycles leads to lengthen, shorten or completely absent of circadian rhythms. Dysfunction of circadian cycle leads to many health problems. The studies in chronobiology provide better understanding of the rhythmic metabolism and disrupted circadian rhythms. In recent years, numerous spectacular researches have been conducted in the field of chronobiology. These researches were intended to understand metabolic process of human body. However, the molecular and genetic mechanisms of circadian clocks still not clearly known. In this study, we aimed to investigate and summarize the recent progress about circadian biological research and understand how biological clocks govern the human metabolism.

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Flexible clock systems: adjusting the temporal programme

Cited by 53 publications

References 192 publications

Bivalve mollusc circadian clock genes can run at tidal frequency

Bivalve mollusc circadian clock genes can run at tidal frequency

Locomotor exercise and circadian rhythms in mammals

Circadian Rhythm and Chronobiology

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