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.


Sci. Signal., 7 August 2012
Vol. 5, Issue 236, p. ec209
[DOI: 10.1126/scisignal.2003467]


Molecular Biology The Inner Workings of a Clock

L. Bryan Ray

Science, Science Signaling, AAAS, Washington, DC 20005, USA

Eukaryotic circadian clocks are built at least in part on transcriptional feedback loops, but the mechanisms underlying circadian feedback are poorly understood. Padmanabhan et al. explored the transcriptional feedback mechanism at the heart of the mammalian circadian clock. The proteins PERIOD (PER) and CRYPTOCHROME suppress transcription of their own genes. PER complexes do so in part by recruiting a histone deacetylase to promoters of clock genes. But PER is also present on DNA in a complex with Senataxin, a helicase that functions in transcriptional termination. Senataxin appears to be inhibited in the PER complex, thus inhibiting termination and further reducing the rate of transcription.

K. Padmanabhan, M. S. Robles, T. Westerling, C. J. Weitz, Feedback regulation of transcriptional termination by the mammalian circadian clock PERIOD complex. Science 337, 599–602 (2012). [Abstract] [Full Text]

Citation: L. B. Ray, The Inner Workings of a Clock. Sci. Signal. 5, ec209 (2012).

To Advertise     Find Products

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