Abstract
In temperate zones, photoperiod changes dramatically over the course of the year, so organisms have evolved mechanisms allowing anticipation of these environmental changes. The information about changes in duration of daylight is conveyed to the organism via neuroendocrine pathways. These pathways involve photoperiodic modulation of rhythmic production of the pineal hormone melatonin which is under control of the circadian system. This chapter will consider the role of the central circadian clock located in the suprachiasmatic nuclei in the adaptation to the photoperiodic changes, focusing on how photoperiod modulates circadian clock mechanisms at the molecular level.
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This review represents a comprehensive overview of research on the SCN as a coordinator of photoperiodic responses, the intercellular coupling changes that accompany that coordination, as well as the SCN’s role in a putative brain network controlling photoperiodic input and output.
Porcu A, Riddle M, Dulcis D, Welsh DK Photoperiod-Induced Neuroplasticity in the Circadian System. Neural Plasticity 2018:5147585. https://doi.org/10.1155/2018/5147585
The review summarizes data proposing that the SCN may be an essential mediator of the effects of seasonal changes of day length on mental health. The authors explore various forms of neuroplasticity that occur in the SCN and other brain regions to facilitate seasonal adaptation, particularly altered phase distribution of cellular circadian oscillators in the SCN and changes in hypothalamic neurotransmitter expression.
Coomans CP, Ramkisoensing A, Meijer JH (2015) The suprachiasmatic nuclei as a seasonal clock. Frontiers in Neuroendocrinology 37:29–42 https://doi.org/10.1016/j.yfrne.2014.11.002
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Dardente H, Wyse CA, Lincoln GA, Wagner GC, Hazlerigg DG, Dardente H et al (2016 Jul 26) Effects of Photoperiod Extension on Clock Gene and Neuropeptide RNA Expression in the SCN of the Soay Sheep. PLoS One. 11(7):e0159201. https://doi.org/10.1371/journal.pone.0159201
Overall, these data demonstrate that synchronizing effects of light on SCN circadian organization proceed similarly in diurnal ungulates and in nocturnal rodents, despite differences in neuropeptide gene expression.
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The preparation of this chapter was supported by the Research Project RV0: 67985823.
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Sumova, A., Illnerova, H. (2020). Photoperiodic Modulation of Clock Gene Expression in the SCN. In: Ebling, F.J.P., Piggins, H.D. (eds) Neuroendocrine Clocks and Calendars. Masterclass in Neuroendocrinology, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-030-55643-3_10
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