Hydrogel-based biocontainment of bacteria for continuous sensing and computation

Area of Science:

• Synthetic biology
• Biotechnology
• Environmental engineering

Background:

• Genetically modified microorganisms (GMMs) offer significant potential for applications like environmental sensing and engineered living materials.
• Current containment methods for GMMs are insufficient, posing a bottleneck for their widespread environmental deployment.
• There is a critical need for robust, multi-layered physical containment strategies for GMMs.

Purpose of the Study:

• To develop and evaluate a novel hydrogel-based encapsulation system for the physical containment of GMMs.
• To demonstrate the efficacy of this system in preventing GMM escape and protecting them from environmental stressors.
• To showcase the functional capabilities of encapsulated GMMs in real-world scenarios.

Main Methods:

• Development of a hydrogel encapsulation system featuring a biocompatible multilayer tough shell and an alginate-based core.
• Testing the containment capabilities of the system against GMM escape under various conditions.
• Assessing the protection offered by the encapsulation against environmental insults such as antibiotics and low pH.
• Evaluating the lifespan control and retrieval ease of the encapsulated GMMs.
• Demonstrating functional applications of encapsulated GMMs, including cell-cell communication and heavy metal sensing.

Main Results:

• The developed deployable physical containment strategy (DEPCOS) demonstrated no detectable escape of GMMs.
• Encapsulated bacteria were protected from environmental insults, including antibiotics and low pH.
• The system allowed for controllable lifespan and easy retrieval of the encapsulated GMMs.
• Robustly encapsulated cells successfully performed functions such as cell-cell communication and heavy metal sensing in environmental water samples.

Conclusions:

• DEPCOS provides a robust and deployable physical containment solution for GMMs, addressing a key bottleneck for their application.
• This technology ensures GMM containment, protects them from environmental hazards, and preserves their functionality.
• DEPCOS facilitates the safe and effective use of GMMs in diverse environmental applications, including sensing and engineered materials.