Design of a bistable switch to control cellular uptake

Area of Science:

• Synthetic biology
• Metabolic engineering
• Systems biology

Background:

• Bistable switches are crucial in synthetic biology for triggering cellular functions.
• Existing switches primarily control gene expression, lacking control over metabolic processes.
• Metabolite uptake is a key cellular function that could benefit from precise control.

Purpose of the Study:

• To design and analyze a novel bistable switch for controlling metabolite uptake rates in cells.
• To explore the potential of an "uptake switch" as a building block for complex synthetic biology circuits.
• To identify robust circuit architectures and design parameters for achieving bistability in metabolite uptake.

Main Methods:

• Mathematical modeling and analysis of genetic circuits.
• Inspiration from natural metabolite uptake and utilization systems.
• Simulation of circuit behavior using realistic models.
• Analysis of parameter design spaces for bistability and phenotypic outcomes.

Main Results:

• An activation-repression architecture was identified as the most robust bistable switch for metabolite uptake.
• The study determined design spaces for achieving bistability with tuneable parameters.
• Conditions were established to maximize the design space and induce bimodal phenotypes through hysteresis and cell-to-cell variability.

Conclusions:

• The proposed uptake switch provides a new interface for controlling cellular metabolism from the extracellular environment.
• Mathematical analysis is a powerful tool for discovering novel synthetic biology circuits.
• The developed bistable switch is a promising design for controlling metabolic phenotypes in cell cultures and coordinating metabolic tasks.