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Buchner, Johannes

Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board Member: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred

SCImago Journal Rank (SJR) 2015: 1.607
Source Normalized Impact per Paper (SNIP) 2015: 0.751
Impact per Publication (IPP) 2015: 2.609

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A Clockwork Organ

David Whitmore / Nicolas Cermakian / Claudia Crosio / Nicholas S. Foulkes / Matthew P. Pando / Zdenka Travnickova / Paolo Sassone-Corsi

Citation Information: Biological Chemistry. Volume 381, Issue 9-10, Pages 793–800, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2000.102, July 2005

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The vertebrate circadian clock was thought to be highly localized to specific anatomical structures: the mammalian suprachiasmatic nucleus (SCN), and the retina and pineal gland in lower vertebrates. However, recent findings in the zebrafish, rat and in cultured cells have suggested that the vertebrate circadian timing system may in fact be highly distributed, with most if not all cells containing a clock.

Our understanding of the clock mechanism has progressed extensively through the use of mutant screening and forward genetic approaches. The first vertebrate clock gene was identified only a few years ago in the mouse by such an approach. More recently, using a syntenic comparative genetic approach, the molecular basis of the the tau mutation in the hamster was determined. The tau gene in the hamster appears to encode casein kinase 1 epsilon, a protein previously shown to be important for PER protein turnover in the Drosophila circadian system. A number of additional clock genes have now been described. These proteins appear to play central roles in the transcription-translation negative feedback loop responsible for clock function. Post-translational modification, protein dimerization and nuclear transport all appear to be essential features of how clocks are thought to tick.

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