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Matthew D'Alessandro1, Stephen Beesley1, Jae Kyoung Kim2,3

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Researchers created a tunable, artificial mammalian circadian clock in vivo. This synthetic biological oscillator restores normal sleep/wake cycles in mice lacking natural circadian rhythms.

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Area of Science:

  • Chronobiology
  • Synthetic Biology
  • Mammalian Physiology

Background:

  • Self-sustaining oscillations are crucial for physiological processes like the cell cycle and circadian rhythms.
  • Synthetic biochemical oscillators offer insights but lack physiological relevance.
  • Mammalian circadian rhythms are regulated by complex feedback loops, often involving PER genes.

Purpose of the Study:

  • To generate a functional, artificial circadian clock in vivo within a mammalian system.
  • To demonstrate the robustness and tunability of a synthetic circadian oscillator.
  • To restore circadian rhythms and associated physiological functions in genetically modified animals.

Main Methods:

  • Development of an inducible Per2 transgene in mice lacking Per1 and Per2 genes.
  • In vivo generation of artificial PER2 rhythms to mimic natural circadian feedback.
  • Assessment of rhythmicity, period, and phase modulation of the synthetic clock.

Main Results:

  • Successfully generated artificial PER2 rhythms in vivo, restoring circadian function.
  • Demonstrated that the synthetic circadian clock is tunable, with predictable modulation of period and phase.
  • Restored circadian sleep/wake cycles in mice deficient in natural circadian rhythms.

Conclusions:

  • The study presents the first artificial, tunable mammalian circadian clock operating in vivo.
  • This synthetic oscillator provides a powerful tool for studying circadian biology and dysfunction.
  • The design principles may advance therapeutic strategies for circadian-related disorders and other oscillatory physiological processes.