Coupling spatial segregation with synthetic circuits to control bacterial survival

Area of Science:

• Synthetic biology
• Microbial engineering
• Biomaterials

Background:

• Engineered bacteria offer significant potential for medicine and environmental remediation.
• Controllability and scalability are critical challenges for realizing this potential.
• Current methods lack precise spatial control over engineered microbial populations.

Purpose of the Study:

• To introduce a novel platform technology, microbial swarmbots, for precise control of engineered bacterial growth dynamics.
• To demonstrate a safeguard strategy preventing unintended bacterial proliferation using synthetic gene circuits.
• To establish a foundation for programmable hybrid biological-material systems.

Main Methods:

• Development of microbial swarmbot capsules utilizing permeable membranes for bacterial encapsulation.
• Engineering synthetic gene circuits in Escherichia coli to link survival to high population density.
• Implementing a density-dependent survival mechanism within the swarmbot system.

Main Results:

• Demonstrated successful spatial arrangement to control engineered bacterial growth dynamics.
• Showcased a safeguard strategy where bacteria survive within capsules but are killed upon escape due to low density.
• Confirmed the modularity and generalizability of the microbial swarmbot design.

Conclusions:

• Microbial swarmbots provide a scalable and controllable platform for engineered bacteria.
• The density-dependent survival mechanism effectively prevents unintended proliferation.
• This technology enables programmable control of hybrid biological-material systems for diverse applications.