In SYNC: the ins and outs of circadian oscillations in calcium

Sci STKE. 2007 Jun 12;2007(390):pe32. doi: 10.1126/stke.3902007pe32.


Many stimuli induce short-term increases in the cytosolic concentration of free calcium ions ([Ca(2+)](i)) that encode signaling information about diverse physiological and developmental events. Slow cytosolic Ca(2+) oscillations that span an entire day have also been discovered in both plants and animals; it is thought that these daily Ca(2+) oscillations may encode circadian clock signaling information. A recent study focusing on the characterization of the extracellular Ca(2+)-sensing receptor (CAS) has provided insight into the molecular mechanisms by which the daily Ca(2+) oscillation in plants is generated. We summarize the major findings regarding daily oscillations of cytosolic Ca(2+) concentrations in plants and animals, and discuss hypothetical biological roles for the circadian clock-regulated physiology in plants.

Publication types

  • Review

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Calcium / physiology
  • Circadian Rhythm / physiology*
  • Flowers / metabolism
  • Mammals / physiology*
  • Models, Biological*
  • Photoperiod
  • Plant Physiological Phenomena*
  • Receptors, Calcium-Sensing / metabolism
  • Second Messenger Systems / physiology*
  • Suprachiasmatic Nucleus / metabolism


  • Receptors, Calcium-Sensing
  • Calcium