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Sleep deprivation reduces the response of neuronal activity in the suprachiasmatic nucleus (SCN) and the phase shift in circadian behaviour to phase shifting light pulses, and thus seems to impair the adaptation of the circadian clock to the external light-dark cycle. The question remains where in the pathway of light input to the SCN the response is reduced. We therefore investigated whether the electroretinogram (ERG) changes after sleep deprivation in wild-type mice and in Opn4 −/− Gnat1 −/−  mutant male mice. We found that the ERG is clearly affected by the Opn4 −/− Gnat1 −/−  mutations, but that the ERG after sleep deprivation does not differ from the baseline response. The difference between wild-type and mutant is in accordance with the lack of functional rod and melanopsin in the retina of the mutant mice. We conclude that the decrease in light responsiveness of the SCN after sleep deprivation is probably not caused by changes at the retinal level, but rather at the postsynaptic site within the SCN, reflecting affected neurotransmitter signalling.

Sleep Deprivation Does not Change the Flash Electroretinogram in Wild-type and Opn4−/−Gnat1−/− Mice

Sleep Deprivation Does not Change the Flash Electroretinogram in Wild-type and Opn4^−/−Gnat1^−/− Mice