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Published on May 25, 2007; 10.1104/pp.107.096149

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Received January 22, 2007
Accepted May 13, 2007

Light-dependent Regulation of Cell Division in Ostreococcus: Evidence for a Major Transcriptional Input

Mickael Moulager , Annabelle Monnier , Béline Jesson , Régis Bouvet , Jean Mosser , Christian Schwartz , Lionel Garnier , Florence Corellou , and Francois-Yves Bouget *

UMR 7628 CNRS, Université Paris VI, Laboratoire Arago, Avenue de Fontaulé, 66650 Banyuls sur Mer, France; OUEST-genopole® transcriptome platform, IFR 140 GFAS, Faculté de Médecine,2 avenue du Pr Léon Bernard, CS 34317 35043 Rennes Cedex, France; Medical Genomics Unit, Molecular Genetics and Biochemistry Department, Hospital Center, Rennes, France; CNRS UMR 6061 "Génétique et Développement", Régulation transcriptionnelle et Oncogenèse, Université de Rennes 1, IFR140 GFAS, Faculté de médecine, 2 avenue du Pr Léon Bernard, CS 34317, 35043 Rennes Cedex, France

* Corresponding author; email: fy.bouget{at}obs-banyuls.fr.

Cell division often occurs at specific times of the day in animal and photosynthetic organisms. Studies in unicellular photosynthetic algae, such as Chlamydomonas or Euglena, have shown that the photoperiodic control of cell division is mediated through the circadian clock. However, the underlying mechanisms remain unknown. We have studied the molecular basis of light-dependent control of cell division in the unicellular green alga Ostreococcus. We found that cell division obeys a circadian oscillator in Ostreococcus. We provide evidences suggesting that the clock may, at least in part, regulate directly cell division independently of the metabolism. Combined microarray and quantitative real time RT-PCR analysis of the main core cell cycle genes expression revealed an extensive transcriptional regulation of cell division by the photoperiod in Ostreococcus. Finally transcription of the main core cell cycle genes, including cyclins and cyclin-dependent kinases, was shown to be under circadian control in Ostreococcus, suggesting that these genes are potential targets of the circadian clock in the control of cell division.






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