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The microscopic green alga Ostreococcus tauri is rapidly emerging as apromising model organism in the green lineage. In particular, recent results byCorellou et al. [Plant Cell, 21, 3436 (2009)] and Thommen et al. [PLoS Comput.Biol. 6, e1000990 (2010)] strongly suggest that its circadian clock is asimplified version of Arabidopsis thaliana clock, and that it is architecturedso as to be robust to natural daylight fluctuations. In this work, we analyzetime series data from luminescent reporters for the two central clock genesTOC1 and CCA1 and correlate them with microarray data previously analyzed. Ourmathematical analysis strongly supports both the existence of a simple two-geneoscillator at the core of Ostreococcus tauri clock and the fact that itsdynamics is not affected by light in normal entrainment conditions, a signatureof its robustness.

A robust two-gene oscillator at the core of Ostreococcus tauri circadian clock