The hypothalamic suprachiasmatic nuclei (SCN) are our principal circadian oscillator, coordinating daily cycles of physiology and behaviour that adapt us to the world. Local versions of the SCN clockwork are also active in peripheral, non-neural tissues, driving the tissue-specific cycles of gene expression that underpin circadian organization. These local oscillators are tuned to each other, and to solar time, by neuroendocrine and metabolic cues that depend on the SCN. The discovery of these local circadian clocks forces a re-appraisal of established models of circadian biology. It also presents new avenues for therapeutic intervention in conditions where disturbance of circadian gene expression is an important cause of morbidity.
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