한빛사논문
Jung Hun Park 1,2, Gábor Holló 1,2,* & Yolanda Schaerli 1,*
1Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland.
2These authors contributed equally: Jung Hun Park, Gábor Holló.
*Corresponding authors: correspondence to Gábor Holló or Yolanda Schaerli
Abstract
Oscillations are a recurrent phenomenon in biological systems across scales, but deciphering their fundamental principles is very challenging. Here, we tackle this challenge by redesigning the wellcharacterised synthetic oscillator known as “repressilator” in Escherichia coli and controlling it using optogenetics, creating the “optoscillator”. Bacterial colonies manifest oscillations as spatial ring patterns. When we apply periodic light pulses, the optoscillator behaves as a forced oscillator and we systematically investigate the properties of the rings under various light conditions. Combining experiments with mathematical modeling, we demonstrate that this simple oscillatory circuit can generate complex dynamics that are transformed into distinct spatial patterns. We report the observation of synchronisation, resonance, subharmonic resonance and period doubling. Furthermore, we present evidence of a chaotic regime. This work highlights the intricate spatiotemporal patterns accessible by synthetic oscillators and underscores the potential of our approach in revealing fundamental principles of biological oscillations.
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