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Role of Melanopsin in Circadian Responses to Light
Melanopsin’s role in how the body’s internal clock responds to light
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Abstract
Knockout mice exhibited a 40% lower behavioral response magnitude to light compared to wild-type mice.
- Melanopsin is proposed as a key molecule in the mammalian circadian system.
- Both wild-type and melanopsin knockout mice showed entrainment to a light/dark cycle.
- Mice of both types phase-shifted after exposure to a light pulse.
- Increased light intensity resulted in a longer circadian period in both groups.
- Induction of the immediate-early gene c-fos occurred in response to nighttime light pulses in both mouse types.
- Melanopsin is associated with enhancing the strength of photic responses, though not essential for basic light input to the circadian clock.
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