Circadian clocks' interactions with oxygen sensing and signalling.

Area of Science:

• Physiology
• Molecular Biology
• Chronobiology

Background:

• Mammalian physiology and metabolism adapt to environmental changes via molecular mechanisms.
• Acute responses to environmental stimuli involve signaling pathways, while anticipatory responses are governed by the circadian clock.
• Oxygen sensing via the Hypoxia-Inducible Factor 1 (HIF-1) pathway is critical for acute responses to oxygen level changes.

Purpose of the Study:

• To review the literature on the crosstalk between the circadian clockwork and oxygen-signaling pathways in mammals.
• To explore molecular and physiological interactions between these two systems.
• To discuss implications under normal and pathological conditions.

Main Methods:

• Literature review of existing research.
• Analysis of molecular and physiological data.
• Synthesis of findings on circadian clock and oxygen-signaling pathway interactions.

Main Results:

• Circadian clocks regulate daily oxygen level oscillations, which can reset the clock via HIF-1.
• The circadian clock modulates the hypoxic response.
• Interactions occur at multiple molecular and functional levels.

Conclusions:

• There are pervasive molecular and functional interactions between the circadian clock and oxygen-signaling pathways in mammals.
• Understanding this crosstalk is crucial for both normal physiology and disease pathogenesis.
• Further research into these interactions can reveal novel therapeutic targets.