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Functional states of organisms vary rhythmically with a period of about a day (i.e., circadian). This endogenous dynamic is shaped by day-night alternations in light and energy. Mammalian circadian rhythms are orchestrated by the hypothalamic suprachiasmatic nucleus (SCN), a brain region specialized for timekeeping. These autonomous ~24-h oscillations are cell-based, requiring transcription-translation-based regulation. SCN circadian oscillations include the maintenance of intrinsic rhythms, sensitivities to input signals, and generation of output signals. These change predictably as time proceeds from dawn to day, dusk, and through the night. SCN neuronal excitability, a highly energy-demanding process, also oscillates over ~24 h. The nature of the relationship of cellular metabolism and excitability had been unknown.

Brain Circadian Oscillators and Redox Regulation in Mammals