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The mechanism by which calcium affects the circadian clock

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If you have a question about this talk, please contact Stephanie Swarbreck.

Circadian clock allows organisms to anticipate daily light and temperature cycles. In plants, circadian rhythms control many biological processes like gene expression and the circadian oscillations of cytosolic-free Ca2+ ([Ca2+]cyt). Since the first model of the oscillator was proposed, the plant clock has been expanded into a complex network of interconnected feedback loops including the cytosolic molecule, cyclic adenosine diphosphate ribose which was proposed to be required to drive circadian [Ca2+]cyt oscillations and modulate the nuclear transcriptional feedback loop of the Arabidopsis circadian oscillator. These findings and the scarce information about the function of circadian [Ca2+]cyt oscillations in both plants and animals, raised the question about whether [Ca2+]cyt regulates the clock.

I will present the different approaches undertaken in the lab to demonstrate that Ca2+cyt is a switch in the Arabidopsis circadian clock that regulates circadian clock gene expression. I will also show that calcium-binding Calmodulin Like Protein 23 (CML23) and CML24 act as Ca2+-signalling components that regulate the circadian network through genetic interaction with CCA1 HIKING EXPEDITION (CHE).

This talk is part of the Plant Sciences Departmental Seminars series.

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