Clock genes: from Drosophila to humans.

Area of Science:

• Chronobiology
• Molecular Biology
• Genetics

Background:

• The circadian clock, crucial for regulating sleep-wake cycles, is orchestrated by a conserved set of clock genes.
• This biological clock operates via a transcriptional feedback loop, generating 24-hour molecular oscillations conserved across species from insects to mammals.

Purpose of the Study:

• To elucidate the fundamental mechanisms of circadian clock function.
• To explore the role of clock genes in regulating physiological processes and their implications in human health.

Main Methods:

• Investigating the transcriptional feedback loop involving activators and repressors that drives circadian oscillations.
• Analyzing the post-translational modifications that regulate the period of molecular oscillations.
• Examining the impact of mutations in clock genes on circadian rhythms and associated physiological functions.

Main Results:

• Circadian oscillations are generated by a core transcriptional feedback loop involving clock genes.
• The period of these oscillations is modulated by post-translational regulation of repressor proteins.
• Mutations in clock genes disrupt sleep-wake rhythms and the temporal organization of physiological processes, leading to human syndromes.

Conclusions:

• Clock genes form the basis of the conserved circadian oscillator, essential for temporal organization of biological functions.
• Post-translational modifications play a critical role in fine-tuning the circadian clock's period.
• Disruptions in clock gene function due to mutations can lead to significant health issues, including sleep disorders and metabolic dysfunction.