The genetic basis of circadian behavior

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Abstract
In most species, an endogenous timing system synchronizes physiology and behavior to the rhythmic succession of day and night. The mammalian circadian pacemaker residing in the suprachiasmatic nuclei (SCN) of the hypothalamus controls peripheral clocks throughout the brain and the body via humoral and neuronal transmission. On the cellular level, these clockworks consist of a set of interwoven transcriptional/translational feedback loops. Recent work emphasizes the tissue specificity of some components of these molecular clockworks and the differential regulation of their rhythmicity by the SCN.