Synthetic Microorganisms with Genomic Kill Switches
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Solution Overview
Problem
Current methods for developing synthetic microorganisms to combat microbial infections, such as MRSA, are laborious and lack efficient safety mechanisms to prevent accidental pathogenicity, with existing solutions requiring complex genetic modifications and lacking stability over time.
Innovation Solution
The development of synthetic microbial strains with genomically incorporated kill switch modifications that ensure safety by initiating programmed cell death upon exposure to systemic conditions, allowing them to durably occupy epithelial niches while preventing bacteremia and SSTI, with minimal genomic disruption and evolutionary stability over 500 generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex genetic modifications are used to create safety mechanisms in synthetic microorganisms, then safety is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent extracts the safety mechanism (kill switch) as a separate, modular genetic element that can be independently designed and inserted. This allows the safety function to be developed and tested separately from the main microorganism construction, reducing overall manufacturing complexity while maintaining high safety standards.
Solution Approach 2:
The genetic modification is divided into distinct functional segments: the kill switch gene, the inducible promoter, and the integration site. This segmentation allows each component to be optimized independently and assembled through standardized methods like Gibson assembly, reducing the complexity of creating the complete safety mechanism.
2Reliability
If multiple genetic modifications are introduced to ensure safety, then safety mechanisms are improved, but the genomic stability deteriorates
Solution Approach 1:
The kill switch is implemented as a discrete genetic element that can be precisely inserted at a specific genomic location without disrupting essential genes. This targeted approach minimizes genomic disruption while maintaining stability over 500 generations.
Solution Approach 2:
The patent performs preliminary validation of genomic stability by testing the modified microorganisms over 500 generations before deployment. This advance testing ensures that the safety mechanisms do not compromise long-term genomic stability.
3Manufacturing precision
If laborious methods are used to construct full operons with promoter regions, then functional precision is improved, but productivity decreases
Solution Approach 1:
The patent uses standardized promoter regions and genetic elements that can be copied and reused across different kill switch designs. This modular approach maintains functional precision while dramatically reducing construction time and effort compared to designing each operon from scratch.
Solution Approach 2:
The patent combines the kill switch gene with standardized regulatory elements (promoters, terminators) into pre-assembled modules. These merged modules can be directly integrated into the microorganism genome using Gibson assembly, improving both precision and productivity.
4Reliability
If synthetic microorganisms are designed to durably occupy epithelial niches, then therapeutic effectiveness is improved, but the risk of accidental pathogenicity increases
Solution Approach 1:
The kill switch is designed to preemptively counter any potential pathogenicity by inducing cell death under specific conditions (e.g., presence of blood, serum, or certain chemicals). This preliminary safety mechanism ensures that even if the microorganism successfully colonizes, it cannot become pathogenic.
Solution Approach 2:
The patent converts the potential harm of long-term colonization into a benefit by designing the kill switch to be activated by specific environmental cues. The same colonization capability that enables therapeutic effectiveness also triggers the safety mechanism when systemic conditions are detected, turning a potential risk into a protective feature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The synthetic microorganisms effectively decolonize undesirable pathogens, replace them safely, and maintain stability and functionality over extended generations, preventing infections and ensuring safety by self-destructing in systemic environments, thus addressing the limitations of existing technologies.
Implementation Method 1
an inducible promoter operably associated with a cell death gene... upon exposure to blood or serum
Implementation Method 2
Bacterial interference can be an effective therapeutic strategy in the management of the microbiome to prevent infectious disease
Data Source
AI summary
Improved methods are provided for preparing synthetic microorganisms, recombinant microorganisms, live biotherapeutic products (rLBPs), and compositions thereof The synthetic microorganisms exhibit functional stability over at least 500 generations and are useful for treatment, prevention, and/or prevention of recurrence of microbial infections.