Melanopsin (Opn4) requirement for normal light-induced circadian phase shifting.

@article{Panda2002MelanopsinR,
  title={Melanopsin (Opn4) requirement for normal light-induced circadian phase shifting.},
  author={Satchidananda Panda and Trey K Sato and Ana Maria de Lauro Castrucci and Mark D. Rollag and Willem J DeGrip and John B. Hogenesch and Ignacio Provencio and Steve A Kay},
  journal={Science},
  year={2002},
  volume={298 5601},
  pages={
          2213-6
        }
}
The master circadian oscillator in the hypothalamic suprachiasmatic nucleus is entrained to the day/night cycle by retinal photoreceptors. Melanopsin (Opn4), an opsin-based photopigment, is a primary candidate for photoreceptor-mediated entrainment. To investigate the functional role of melanopsin in light resetting of the oscillator, we generated melanopsin-null mice (Opn4-/-). These mice entrain to a light/dark cycle and do not exhibit any overt defect in circadian activity rhythms under… CONTINUE READING

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