Robustness of Clocks to Input Noise

Physical Review Letters
Michele MontiPieter Rein ten Wolde

Abstract

To estimate the time, many organisms, ranging from cyanobacteria to animals, employ a circadian clock which is based on a limit-cycle oscillator that can tick autonomously with a nearly 24 h period. Yet, a limit-cycle oscillator is not essential for knowing the time, as exemplified by bacteria that possess an "hourglass": a system that when forced by an oscillatory light input exhibits robust oscillations from which the organism can infer the time, but that in the absence of driving relaxes to a stable fixed point. Here, using models of the Kai system of cyanobacteria, we compare a limit-cycle oscillator with two hourglass models, one that without driving relaxes exponentially and one that does so in an oscillatory fashion. In the limit of low input noise, all three systems are equally informative on time, yet in the regime of high input-noise the limit-cycle oscillator is far superior. The same behavior is found in the Stuart-Landau model, indicating that our result is universal.

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Citations

May 2, 2019·Journal of the Royal Society, Interface·Robert MarslandJordan M Horowitz
Feb 18, 2021·ELife·Giulia Malaguti, Pieter Rein Ten Wolde
Jan 22, 2021·Physical Biology·Arvind MuruganNigel Goldenfeld
Aug 11, 2021·Scientific Reports·Tim BreitenbachThomas Dandekar

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