Circadian clock resetting

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Figure 22.1 Pathways projecting to and from the suprachiasmatic nucleus (SCN). Inputs from photoreceptors in the retina help to reset the circadian clock in response to changes in the light cycle. Other inputs derive from the lateral geniculate complex and the serotonergic, Raphe nuclei and help to reset the SCN in response to non-photic stimuli. Neurons in the SCN project to the hypothalamus, which has a key role in the regulation of the reproductive cycle, mood and the sleep-waking cycle. These neurons also project to the pineal gland which shows rhythmic changes in the rate of synthesis and release of the hormone, melatonin...

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Shigeyoshi Y, Taguchi K, Yamamoto S et al 1997 Light-induced resetting of a mammalian circadian clock is associated with rapid induction of the mPerl transcript. Cell 91 1043—1053... 

Emery P, So WV, Kaneko M, Hall JC, Rosbash M 1998 CRY, a Drosophila clock and light-regulated cryptochrome, is a major contributor to circadian rhythm resetting and photosensitivity. Cell 95 669-679... 

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Ehlen JC, Grossman GH, Glass JD. In vivo resetting of the hamster circadian clock by 5-HT7 receptors in the suprachiasmatic nucleus. J Neurosci 2001 21 5351-5357. 

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Thompson, C. L., and Sancar, A. (2002). Photolyase/cryptochrome blue-light photoreceptors use photon energy to repair DNA and reset the circadian clock. Oncogene 21, 9043-9056. 

Ding, J. M., Chen, D., Weber, E. T. et al. (1994). Resetting the biological clock mediation of nocturnal circadian shifts by glutamate and NO. Science 266, 1713-17. 

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