Summary
This conference report summarizes advances in non-visual opsin biology, covering the discovery and diversity of opsins such as melanopsin (OPN4) and neuropsin (OPN5) that mediate light-dependent physiological functions beyond visual transduction. For lighting designers and researchers, understanding these non-visual photoreceptors is foundational to designing light environments that effectively regulate circadian rhythms and other light-dependent health outcomes.
Key Findings
- Pinopsin was the first animal opsin identified in extra-ocular tissue (chick pineal cells, 1994), establishing that opsins serve non-visual functions beyond retinal rod and cone visual transduction.
- Vertebrate melanopsin (OPN4) clusters phylogenetically with invertebrate visual opsins (mollusc and arthropod), suggesting an ancient lineage for non-visual photoreception.
- Non-visual opsins including OPN3, OPN4, and OPN5 are expressed in extra-retinal photosensitive tissues as well as in a subset of retinal neurons distinct from rods and cones, implicating them in photic regulation of biological rhythms.
Categories
The Science of Light: Reviews opsin biology, melanopsin (OPN4), and non-visual photoreception mechanisms underlying circadian and non-image-forming light responses.
Sleep & Circadian Health: Discusses photic regulation of biological rhythms through non-visual opsins including pinopsin and melanopsin in extra-retinal tissues.
Author(s)
Y Fukada
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 twoāprocess 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