Melanopsin cells are the principal conduits for rod–cone input to non-image-forming vision (original) (raw)

Nature volume 453, pages 102–105 (2008)Cite this article

Abstract

Rod and cone photoreceptors detect light and relay this information through a multisynaptic pathway to the brain by means of retinal ganglion cells (RGCs)1. These retinal outputs support not only pattern vision but also non-image-forming (NIF) functions, which include circadian photoentrainment and pupillary light reflex (PLR). In mammals, NIF functions are mediated by rods, cones and the melanopsin-containing intrinsically photosensitive retinal ganglion cells (ipRGCs)2,3. Rod–cone photoreceptors and ipRGCs are complementary in signalling light intensity for NIF functions4,5,6,7,8,9,10,11,12. The ipRGCs, in addition to being directly photosensitive, also receive synaptic input from rod–cone networks13,14. To determine how the ipRGCs relay rod–cone light information for both image-forming and non-image-forming functions, we genetically ablated ipRGCs in mice. Here we show that animals lacking ipRGCs retain pattern vision but have deficits in both PLR and circadian photoentrainment that are more extensive than those observed in melanopsin knockouts8,10,11. The defects in PLR and photoentrainment resemble those observed in animals that lack phototransduction in all three photoreceptor classes6. These results indicate that light signals for irradiance detection are dissociated from pattern vision at the retinal ganglion cell level, and animals that cannot detect light for NIF functions are still capable of image formation.

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Acknowledgements

We thank J. Mackes and G. Harrison for help in genotyping the animals; R. Kuruvilla, M. Van Doren, B. Wendland, M. Halpern, M. Caterina, C.-Y. Su, J. Bradley and laboratory members in the Biology Department at the Johns Hopkins University for scientific discussions and comments on the manuscript. This work was supported by grants from the National Institutes of Health (to S. Hattar and K.-W.Y.), the Biotechnology and Biological Sciences Research Council (to R.J.L.) and the David and Lucile Packard and Alfred P. Sloan Foundations (to S. Hattar).

Author Contributions A.D.G. and S. Hattar wrote the paper. J.L.E., R.J.L., D.M.B. and T.C.B. gave helpful comments on the manuscript. A.D.G., J.L.E. and C.M.A. in S. Hattar’s laboratory performed all the behavioural studies on the aDTA homozygous animals, as well as the X-gal staining of the Opn4 aDTA/tau-LacZ and Opn4 tau-LacZ/+ animals, the morphology of the retina, the cholera toxin injections, the water maze and the optomotor studies. D.M.B. helped in analysing the brains of the Opn4 aDTA/tau-lacZ and the cholera-toxin-injected animals. G.S.L. and A.R.B. in R.J.L.’s laboratory conducted all the behavioural studies on the aDTA heterozygous animals, and the electroretinogram studies. T.C.B. provided the construct and suggestions for the aDTA targeting strategy. H.C. made the optokinetic nystagmus recordings. H.-W.L. in K.-W.Y.’s laboratory performed the melanopsin immunostaining on aDTA heterozygous mice. Animals were first conceived in K.-W.Y.’s laboratory and produced by S. Hattar and S. Haq to the chimeric stage. Germline transmission was obtained independently in the laboratories of S. Hattar (with help from H.Z.) and K.-W.Y. All other authors helped in the planning, technical support and discussions of experiments.

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Author notes

  1. Ali D. Güler, Jennifer L. Ecker and Gurprit S. Lall: These authors contributed equally to this work.

Authors and Affiliations

  1. Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, USA,
    Ali D. Güler, Jennifer L. Ecker, Cara M. Altimus, Haiqing Zhao & Samer Hattar
  2. Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
    Gurprit S. Lall, Alun R. Barnard & Robert J. Lucas
  3. Department of Neuroscience, and,
    Shafiqul Haq, Hsi-Wen Liao, Hugh Cahill & King-Wai Yau
  4. Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA ,
    Tudor C. Badea
  5. Visual Neuroscience, University of Oxford, Oxford OX3 7BN, UK
    Mark W. Hankins
  6. Department of Neuroscience, Brown University, Providence, Rhode Island 02912, USA,
    David M. Berson

Authors

  1. Ali D. Güler
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  2. Jennifer L. Ecker
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  3. Gurprit S. Lall
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  4. Shafiqul Haq
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  5. Cara M. Altimus
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  6. Hsi-Wen Liao
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  7. Alun R. Barnard
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  8. Hugh Cahill
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  9. Tudor C. Badea
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  10. Haiqing Zhao
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  11. Mark W. Hankins
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  12. David M. Berson
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  13. Robert J. Lucas
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  14. King-Wai Yau
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  15. Samer Hattar
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Corresponding authors

Correspondence toRobert J. Lucas or Samer Hattar.

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Supplementary information

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Güler, A., Ecker, J., Lall, G. et al. Melanopsin cells are the principal conduits for rod–cone input to non-image-forming vision.Nature 453, 102–105 (2008). https://doi.org/10.1038/nature06829

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Editorial Summary

Clock watching

The mammalian retina has three types of light-sensing cells: rods, cones and melanopsin-containing cells. Rods and cones are involved in vision but have also been shown to contribute to light entrainment of the circadian clock. Now Güler et al. show that the non-image forming (circadian) role of rods and cones involves signalling via melanopsin-containing cells. This finding implies that people with troubled sleep or seasonal depression could benefit from light detection and melatonin suppression tests even if they are normally sighted.