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Role of Melanopsin in Circadian Responses to Light
Norman F. Ruby,1*Thomas J. Brennan,2Xinmin Xie,2Vinh Cao,1Paul Franken,1H. Craig Heller,1Bruce F. O'Hara1*
Melanopsin has been proposed as an important
photoreceptive molecule for the mammalian circadian system. Its
importance inthis role was tested in melanopsin knockout mice. These
mice entrainedto a light/dark cycle, phase-shifted after a light
pulse, andincreased circadian period when light intensity increased.
Inductionof the immediate-early gene c-fos was observed
after a nighttimelight pulse in both wild-type and knockout mice.
However, themagnitude of these behavioral responses in knockout mice
was 40%lower than in wild-type mice. Although melanopsin is not
essentialfor the circadian clock to receive photic input, it
contributessignificantly to the magnitude of photic responses.
1 Department of Biological Sciences, Stanford
University, Stanford, CA 94305, USA.
2 Deltagen,
Inc., Redwood City, CA 94063, USA.
*
To whom correspondence should be addressed. E-mail:
ruby{at}stanford.edu, bfo{at}stanford.edu.
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