Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Subscribe

Sci. Signal., 22 March 2011
Vol. 4, Issue 165, p. ec87
[DOI: 10.1126/scisignal.4165ec87]

EDITORS' CHOICE

Neuroscience The Brain’s Alarm Clock

Pamela J. Hines

Science Signaling, AAAS, Washington, DC 20005, USA

Circadian rhythms are linked to the external light-dark cycle through inputs from photoreceptors that signal into networks that regulate neural and physiological function. One of the key photoreceptors is CRYPTOCHROME, which is sensitive to blue-light wavelengths. Fogle et al. (see the Perspective by Im and Taghert) now find that CRYPTOCHROME has an unexpectedly direct effect on circadian physiology in fruit flies. A small group of neurons that are part of the circadian circuit and that are usually more active in the morning express CRYPTOCHROME. These neurons normally receive plenty of input from the circadian circuit that perceives cycles and drives responses. However, when those inputs are blocked, it seems that these neurons are able to respond directly to blue light.

K. J. Fogle, K. G. Parson, N. A. Dahm, T. C. Holmes, CRYPTOCHROME is a blue-light sensor that regulates neuronal firing rate. Science 331, 1409–1413 (2011). [Abstract] [Full Text]

S. H. Im, P. H. Taghert, A CRY to rise. Science 331, 1394–1395 (2011). [Abstract] [Full Text]

Citation: P. J. Hines, The Brain’s Alarm Clock. Sci. Signal. 4, ec87 (2011).



To Advertise     Find Products


Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882