Abstract
The possession of a circadian system allows an organism to anticipate 24 h rhythmic phenomena, rather than passively responding to changes in the external environment. Physiology and behaviour can be fine-tuned in advance of the altered conditions and no time will be lost in the adjustment process. In mammals, the suprachiasmatic nuclei (SCN) of the hypothalamus are the site of a master circadian pacemaker, coordinating 24 h rhythms throughout the body including sleep/wake cycles. The primary regulatory input into the SCN is light. The light-dark cycle arising from the rotation of the Earth provides a robust 24 h signal enabling the internal and external cycles to be synchronised (entrained). The influence of light upon this central clock is mediated by photoreceptors within the eye, but until recently it remained unclear which ocular cells provided dawn/dusk information for photoentrainment. Research into the mechanisms of mammalian photoentrainment resulted in the identification of a third class of ocular photoreceptor, quite different from the rods and cones. This system is comprised of a subset of photosensitive retinal ganglion cells (pRGCs) expressing the photopigment melanopsin. Subsequent studies have shown that these cells not only regulate the circadian system but also mediate a broad range of other irradiance-detection tasks, including pineal melatonin suppression and pupil constriction.
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Peirson, S.N., Foster, R.G. (2010). Nonimage Forming Photoreceptors. In: Albrecht, U. (eds) The Circadian Clock. Protein Reviews, vol 12. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1262-6_4
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DOI: https://doi.org/10.1007/978-1-4419-1262-6_4
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