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Photic Regulation of Clock Systems
How Light Controls the Body’s Internal Clocks
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Abstract
A novel photoreceptor system in the retina plays a crucial role in the entrainment of circadian rhythms.
- Circadian rhythms help organisms anticipate environmental changes, providing a selective advantage.
- These rhythms depend on a molecular clock formed by a feedback loop involving key clock genes.
- Light is the primary signal for entraining circadian rhythms in mammals, detected by retinal photoreceptors.
- Photosensitive retinal ganglion cells expressing melanopsin are part of this novel photoreceptor system.
- Light input from these cells reaches the master circadian pacemaker in the suprachiasmatic nuclei via the retinohypothalamic tract.
- Recent advances have improved understanding of how light regulates the molecular clock in the SCN.
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