Robustness in spatially driven bistability in signaling systems

Area of Science:

• Systems biology
• Biophysics
• Cellular dynamics

Background:

• Biological systems exhibit spatial organization, leading to emergent complex behaviors like bistability.
• Understanding the link between spatiality and dynamic response is crucial for biological output.
• The robustness and extent of spatial influence on biological dynamics require further exploration.

Purpose of the Study:

• To quantify the frequency of bistability in a spatially organized system across parameter space.
• To identify critical parameters and their ranges influencing bistability emergence and properties.
• To simplify a compartmentalized system while retaining compartment-induced bistability.

Main Methods:

• Analysis of a previously described system with two monostable modules in different cellular compartments.
• Quantification of bistability occurrence through parameter space exploration.
• Model simplification to identify a minimal system preserving bistability.

Main Results:

• A very small fraction of the sampled parameter space yielded a bistable response.
• Shuttling parameters were identified as highly influential in controlling bistability.
• A simplified model was developed that retains compartment-induced bistability.

Conclusions:

• Compartmentalization plays a key role in generating bistability within biological systems.
• Shuttling dynamics are critical for the emergence and control of bistability.
• The proposed minimal system offers insights into how complex behaviors arise from compartmentalization.