Photorefractoriness in mammals: dissociating a seasonal timer from the circadian-based photoperiod response.

@article{Lincoln2005PhotorefractorinessIM,
  title={Photorefractoriness in mammals: dissociating a seasonal timer from the circadian-based photoperiod response.},
  author={Gerald A. Lincoln and Jonathan D Johnston and H{\aa}kan Andersson and Gabriela C. Wagner and David Hazlerigg},
  journal={Endocrinology},
  year={2005},
  volume={146 9},
  pages={3782-90}
}
In seasonal animals, prolonged exposure to constant photoperiod induces photorefractoriness, causing spontaneous reversion in physiology to that of the previous photoperiodic state. This study tested the hypothesis that the onset of photorefractoriness is correlated with a change in circadian expression of clock genes in the suprachiasmatic nucleus (circadian pacemaker) and the pars tuberalis (PT, a melatonin target tissue). Soay sheep were exposed to summer photoperiod (16-h light) for either… CONTINUE READING

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Photorefractoriness in Mammals Endocrinology

  • P Klosen, C Bienvenu, +4 authors Lincoln
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Evidence for an endogenous Per 1 and ICER - independent seasonal timer in the hamster pituitary gland

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