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Robust network topologies for generating oscillations with temperature-independent periods
Lili Wu1, Qi Ouyang1,2,3, Hongli Wang1,2
1The State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing, China.
Plos One
|February 3, 2017
Summary
Circadian clocks maintain a stable oscillation period despite temperature changes, a property crucial for life. This study identifies network designs, like hybrid motifs, that enhance this temperature-independent biological timing.
Area of Science:
- Systems Biology
- Molecular Biology
- Genetics
Background:
- Circadian clocks exhibit temperature-independent oscillation periods across living systems.
- This robustness is a system-level property linked to the clock's network architecture.
Purpose of the Study:
- To investigate the mechanism behind temperature-independent circadian clock oscillations.
- To provide guidance for designing robust genetic oscillators with temperature-compensated periods.
Main Methods:
- Theoretical exploration of genetic regulatory circuit topologies.
- Enumeration of all three-gene network motifs.
- Analysis of oscillation capacity and temperature sensitivity of network motifs.
Main Results:
- Identified four core network motifs: delayed negative feedback, repressilator, activator-inhibitor, and substrate-depletion oscillators.
- Delayed negative feedback and repressilator motifs enhance oscillation robustness.
- Activator-inhibitor and substrate-depletion motifs excel at maintaining temperature-independent periods.
Conclusions:
- Hybridizing robust oscillation motifs with temperature-independent motifs can create thermally robust oscillations.
- Mechanisms like antagonistic balance and temperature insulation contribute to temperature compensation.
- Temperature insulation ensures oscillation periods are minimally affected by temperature, yielding robust circadian rhythms.
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