Cited by 278Circadian rhythm and melatoninPhotoreceptor and optogenetics researchLight effects on plants

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A “Melanopic” Spectral Efficiency Function Predicts the Sensitivity of Melanopsin Photoreceptors to Polychromatic Lights

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Enezi, Jazi al, Revell, Victoria, Brown, Timothy, Wynne, Jonathan, Schlangen, Luc, Lucas, Robert·2011·Journal of Biological Rhythms

DOI 10.1177/0748730411409719

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Abstract

Photoreception in the mammalian retina is not restricted to rods and cones but extends to a small number of intrinsically photosensitive retinal ganglion cells expressing the photopigment melanopsin. These mRGCs are especially important contributors to circadian entrainment, the pupil light reflex, and other so-called nonimage-forming (NIF) responses. The spectral sensitivity of melanopsin phototransduction has been addressed in several species by comparing responses to a range of monochromatic stimuli. The resultant action spectra match the predicted profile of an opsin:vitamin A–based photopigment (nomogram) with a peak sensitivity (λ max ) around 480 nm. It would be most useful to be able to use this spectral sensitivity function to predict melanopsin’s sensitivity to broad-spectrum, including “white,” lights. However, evidence that melanopsin is a bistable pigment with an intrinsic light-dependent bleach recovery mechanism raises the possibility of a more complex relationship between spectral quality and photoreceptor response. Here, we set out to empirically determine whether simply weighting optical power at each wavelength according to the 480-nm nomogram and integrating across the spectrum could predict melanopsin sensitivity to a variety of polychromatic stimuli. We show that pupillomotor and circadian responses of mice relying solely on melanopsin for their photosensitivity ( rd/rd cl) can indeed be accurately predicted using this methodology. Our data therefore suggest that the 480-nm nomogram may be employed as the basis for a new photometric measure of light intensity (which we term “melanopic”) relevant for melanopsin photoreception. They further show that measuring light in these terms predicts the melanopsin response to light of divergent spectral composition much more reliably than other methods for quantifying irradiance or illuminance currently in widespread use.

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Authors: Enezi, J. A., Revell, V., Brown, T., Wynne, J., Schlangen, L., & Lucas, R.
Affiliations: Faculty of Life Sciences, University of Manchester, Manchester, UK
University of Surrey (GB)
University of Manchester (GB)
Signify (Netherlands) (NL)
Corresponding author: Lucas, Robert
ORCID: Revell, Victoria
Brown, Timothy
Schlangen, Luc
Lucas, Robert
Venue: Journal of Biological Rhythms
Publisher: SAGE Publications
Published: 2011-07-19
Volume: 26
Issue: 4
Pages: 314-323
ISSN: 0748-7304 (ISSN-L)
1552-4531
DOI: 10.1177/0748730411409719
OpenAlex: W2164918415
Cited by: 278
References: 37
Citations by year: 2026: 12 · 2025: 21 · 2024: 16 · 2023: 32 · 2022: 29 · 2021: 30 · 2020: 24 · 2019: 23 · 2018: 17 · 2017: 15 · 2016: 11 · 2015: 9 · 2014: 13 · 2013: 12 · 2012: 13
FWCI: 5.77
Type: journal article
Language: en
Open access: bronze
doi.org
Licence: journals.sagepub.com/page/policies/text-and-data-mining-license (tdm)
Locations: Journal of Biological Rhythms (publishedVersion)
PubMed (publishedVersion)
Research Explorer (The University of Manchester) (publishedVersion)
TU/e Research Portal (submittedVersion)
Surrey Research Insight Open Access (The University of Surrey) (submittedVersion)
Funders: Wellcome Trust
Topics: Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Photoreceptor and optogenetics research
Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
Keywords: melanopsin, intrinsically photosensitive retinal ganglion cells, pupillary light reflex, circadian entrainment, polychromatic light, white light, photometry, photopigment bleaching
MeSH terms: Melanopsin, Animals, Light, Mice, Inbred C3H, Rod Opsins, Photoreceptor Cells, Vertebrate, Mice

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A “Melanopic” Spectral Efficiency Function Predicts the Sensitivity of Melanopsin Photoreceptors to Polychromatic Lights

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