Probing entrainment of Ostreococcus tauri circadian clock by green and blue light through a mathematical modeling approach

Frontiers in Genetics
Quentin ThommenMarc Lefranc

Abstract

Most organisms anticipate daily environmental variations and orchestrate cellular functions thanks to a circadian clock which entrains robustly to the day/night cycle, despite fluctuations in light intensity due to weather or seasonal variations. Marine organisms are also subjected to fluctuations in light spectral composition as their depth varies, due to differential absorption of different wavelengths by sea water. Studying how light input pathways contribute to circadian clock robustness is therefore important. Ostreococcus tauri, a unicellular picoplanktonic marine green alga with low genomic complexity and simple cellular organization, has become a promising model organism for systems biology. Functional and modeling approaches have shown that a core circadian oscillator based on orthologs of Arabidopsis TOC1 and CCA1 clock genes accounts for most experimental data acquired under a wide range of conditions. Some evidence points at putative light input pathway(s) consisting of a two-component signaling system (TCS) controlled by the only two histidine kinases (HK) of O. tauri. LOV-HK is a blue light photoreceptor under circadian control, that is required for circadian clock function. An involvement of Rhodopsin-HK (Rhod-HK...Continue Reading

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Citations

Feb 24, 2016·Frontiers in Plant Science·Joëlle De CaluwéDidier Gonze
Jun 2, 2015·Frontiers in Genetics·Thierry Tonon, Damien Eveillard
Mar 19, 2019·The Plant Journal : for Cell and Molecular Biology·Eric PolinerEva M Farré
Jul 29, 2017·Frontiers in Plant Science·Pedro de Los ReyesFederico Valverde
Feb 7, 2021·Proceedings of the National Academy of Sciences of the United States of America·Sacha N CoeselE Virginia Armbrust

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Methods Mentioned

BETA
phosphotransferase

Software Mentioned

LOV
Rhod
MINPACK
HK

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