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Related Experiment Video

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Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System

Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System

Published on: December 16, 2022

Multiple light inputs to a simple clock circuit allow complex biological rhythms.

Carl Troein¹, Florence Corellou, Laura E Dixon

¹School of Biological Sciences, University of Edinburgh and Centre for Systems Biology at Edinburgh, Edinburgh EH93JD, UK.

The Plant Journal : for Cell and Molecular Biology

|January 12, 2011

Summary

This summary is machine-generated.

The study models the Ostreococcus tauri circadian clock, revealing how a simple feedback loop with TOC1 and CCA1 genes generates complex responses to light. This offers insights into plant circadian timing mechanisms.

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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters

Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters

Published on: September 27, 2012

Area of Science:

Chronobiology
Molecular Biology
Algal Biology

Background:

Circadian clocks regulate cellular activities in anticipation of environmental changes.
Studying plant circadian networks is complex due to gene redundancy.
Ostreococcus tauri, a picoeukaryotic alga, offers a simpler model with non-redundant clock genes.

Purpose of the Study:

To develop a model of the Ostreococcus tauri circadian clock.
To understand the feedback loop between TOC1 and CCA1 genes.
To investigate the clock's response to varying photoperiods and light conditions.

Main Methods:

Utilized extensive time-series data from in vivo reporter gene assays.
Developed a computational model of the Ostreococcus clock's feedback loop.
Systematically screened effects of altered day length on clock dynamics.

Main Results:

The model accurately reproduced transcriptional and translational reporter dynamics across different photoperiods.
The model successfully predicted transient clock behavior under altered light conditions.
A complex relationship between circadian phase and photoperiod was identified and modeled.

Conclusions:

The Ostreococcus clock, despite its simplicity, exhibits complex light responses.
Circadian gating of light-dependent mechanisms underlies this complexity.
Light-dependent reactions are crucial for flexible timing in this single-feedback-loop circadian clock.