Intracellular coordination by the ultradian clock.
Article first published online: 2 JAN 2013
© The Author(s) Journal compilation © 1993 International Federation for Cell Biology
Cell Biology International
Volume 17, Issue 12, pages 1047–1052, December 1993
How to Cite
Lloyd, D. and Kippert, F. (1993), Intracellular coordination by the ultradian clock. Cell Biology International, 17: 1047–1052. doi: 10.1006/cbir.1993.1037
- Issue published online: 2 JAN 2013
- Article first published online: 2 JAN 2013
- Paper received 03.11.93. Paper accepted 17.11.93
- Cited By
The time structure of a biological system is at least as intricate as its spatial structure. Whereas we have detailed information about the latter, our understanding of the former is still rudimentary. As techniques for monitoring intracellular processes continuously in single cells become more refined, it becomes increasingly evident that periodic behaviour abounds in all time domains. Timekeeping is essential for synchronization and coordination of intracellular processes. The presence of a temperature-compensated oscillator provides such a timer. The coupled outputs (epigenetic oscillations) of this ultradian clock constitute a special class of ultradian rhythm. These are undamped and endogenously driven by a device which shows biochemical properties characteristic of transcriptional and translational elements. Energy-yielding processes, protein turnover, motility, and the timing of the cell division cycle processes, are all controlled by the ultradian clock. Different periods 30 min-4h characterize different species.