Summary
This paper elucidates how melanopsin (OPN4) in M1-subtype intrinsically photosensitive retinal ganglion cells (ipRGCs) — which provide ~80% of SCN innervation — drives circadian entrainment in vertebrates. Understanding this pathway informs lighting design strategies that target melanopsin-sensitive wavelengths to effectively shift or stabilize circadian rhythms.
Key Findings
- Approximately 80% of SCN innervation comes from M1-subtype ipRGCs, establishing them as the primary conduit for photic entrainment signals.
- OPN4 (melanopsin) expression in M1-subtype ipRGCs significantly regulates rhythmic circadian outputs in vertebrates.
- Melanopsin-mediated optical entrainment is identified as the dominant mechanism by which light synchronizes the master circadian clock in the SCN.
Categories
The Science of Light: Details the role of melanopsin (OPN4) in M1-subtype ipRGCs and their innervation of the SCN for phototransduction and circadian entrainment.
Sleep & Circadian Health: Examines how melanopsin-mediated optical entrainment regulates circadian rhythms in vertebrates, with direct implications for light-dark cycle management.
Author(s)
D Pan, Z Wang, Y Chen, J Cao
Publication Year
2023
Related Publications
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
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors