Summary
NPAS2 is a heme-binding, gas-responsive transcription factor that forms part of the core circadian feedback loop by heterodimerizing with ARNTL and functionally substituting for CLOCK in both central (SCN) and peripheral oscillators. Understanding NPAS2's role in the molecular clockwork informs how circadian disruption—such as from irregular light exposure—can affect gene expression in multiple tissues including liver and kidney.
Key Findings
- NPAS2 can functionally substitute for CLOCK in the transcriptional/translational feedback loop governing circadian rhythms in the SCN and peripheral tissues (liver, kidney).
- NPAS2 acts as a pyridine nucleotide-dependent and CO-dependent transcription factor, linking metabolic and gaseous signaling to circadian clock regulation.
- NPAS2 heterodimerizes with ARNTL (BMAL1) in the activating limb of the circadian feedback loop, placing it as a core element of molecular timekeeping.
Categories
Sleep & Circadian Health: NPAS2 is a core component of the molecular circadian clock, substituting for CLOCK in SCN and peripheral oscillators.
The Science of Light: The paper examines circadian transcription factor biology relevant to understanding how light-dark cycles regulate molecular clockwork.
Author(s)
E Murgo, T Colangelo, MM Bellet, F Malatesta
Publication Year
2023
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The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice