Title :

Robust and flexible response of the Ostreococcus tauri circadian clock to light/dark cycles of varying photoperiod

Author(s) :

Thommen, Quentin [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Pfeuty, Benjamin [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Corellou, Florence [Auteur]
Laboratoire d'Océanographie Microbienne [LOMIC]
Bouget, François-Yves [Auteur]
Laboratoire d'Océanographie Microbienne [LOMIC]
Lefranc, Marc [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Journal title :

Febs Journal

Pages :

3432-3448

Publisher :

Wiley

Publication date :

2012

ISSN :

1742-464X

HAL domain(s) :

Physique [physics]/Physique [physics]/Biophysique [physics.bio-ph]

English abstract : [en]

The green microscopic alga Ostreococcus tauri has recently emerged as a promising model for understanding how circadian clocks, which drive the daily biological rhythms of many organisms, synchronize to the day/night cycle ...
Show more >The green microscopic alga Ostreococcus tauri has recently emerged as a promising model for understanding how circadian clocks, which drive the daily biological rhythms of many organisms, synchronize to the day/night cycle in changing weather and seasons. Here, we analyze translational reporter time series data for the central clock genes CCA1 and TOC1 for a wide range of daylight durations (photoperiods). The variation of temporal expression profiles with day duration is complex, with the two protein peaks tracking different times of the day. Nevertheless, all profiles are accurately reproduced by a simple two-gene transcriptional loop model whose parameters depend on light only through the photoperiod value. We show that this non-intuitive behavior allows the circadian clock to combine flexibility and robustness with respect to daylight fluctuations.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL