Modeling circadian clocks: Roles,advantages, and limitations |
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Authors: | Didier Gonze |
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Institution: | 1.Unité de Chronobiologie Théorique, Service de Chimie Physique,Université Libre de Bruxelles,Brussels,Belgium;2.Laboratoire de Bioinformatique des Génomes et des Réseaux, Faculté des Sciences,Université Libre de Bruxelles Campus Plaine,Brussels,Belgium |
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Abstract: | Circadian rhythms are endogenous oscillations characterized by a period of about 24h. They constitute the biological rhythms
with the longest period known to be generated at the molecular level. The abundance of genetic information and the complexity
of the molecular circuitry make circadian clocks a system of choice for theoretical studies. Many mathematical models have
been proposed to understand the molecular regulatory mechanisms that underly these circadian oscillations and to account for
their dynamic properties (temperature compensation, entrainment by light dark cycles, phase shifts by light pulses, rhythm
splitting, robustness to molecular noise, intercellular synchronization). The roles and advantages of modeling are discussed
and illustrated using a variety of selected examples. This survey will lead to the proposal of an integrated view of the circadian
system in which various aspects (interlocked feedback loops, inter-cellular coupling, and stochasticity) should be considered
together to understand the design and the dynamics of circadian clocks. Some limitations of these models are commented and
challenges for the future identified. |
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Keywords: | |
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