C. Acnes Phage-Derived DNA Delivery for In Situ Strain Modification
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Solution Overview
Problem
Current methods for genetic modification of Cutibacterium acnes strains are inefficient and limited to specific strains due to the lack of robust replicative DNA vectors and the need for in vitro delivery, making it difficult to target diverse skin microbiomes effectively.
Innovation Solution
Development of Cutibacterium acnes phagemids and phage-derived particles that include a phage packaging signal and a gene of interest, allowing for in situ delivery and replication of DNA vectors, enabling targeted genetic modification of C. acnes strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If in vitro delivery methods are used for genetic modification of C. acnes, then delivery can be performed outside the body, but the efficiency is low and it is limited to specific strains
Solution Approach 1:
The patent uses phage-derived particles as an intermediary vector to deliver DNA payloads into C. acnes bacteria. These particles act as mediators between the external DNA source and the bacterial cells, enabling efficient in situ transduction without requiring complex in vitro manipulation. The phage particles naturally infect C. acnes and deliver the genetic material directly within the skin environment.
Solution Approach 2:
The phage-derived particles utilize their natural infectivity mechanisms to deliver DNA payloads autonomously. The particles self-assemble and self-propagate within the bacterial population, using the bacteria's own cellular machinery to express the delivered genes. This eliminates the need for external intervention and enables sustained genetic modification in situ.
2Reliability
If robust replicative DNA vectors are developed, then stable genetic modification is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the DNA vector system into modular components: phage packaging signals for particle assembly, origins of replication for autonomous replication, and selectable markers for identification. This modular design allows each component to perform its specific function independently while contributing to overall system stability and reliability.
Solution Approach 2:
The phage-derived particle system serves multiple functions simultaneously: it acts as a delivery vehicle, a replicative vector, and a selection system. The same particle structure that enables infection also contains the replication origin and packaging signals, reducing the need for separate complex systems and maintaining reliability without proportionally increasing complexity.
3Adaptability or versatility
If in situ delivery is implemented, then diverse skin microbiomes can be targeted, but the delivery system becomes more complex
Solution Approach 1:
The patent employs phage packaging signals with specific sequence parameters that can be adjusted to target different C. acnes strains. By modifying the packaging signal sequences or the phage host range, the system can adapt to diverse skin microbiome compositions without requiring a completely different delivery mechanism for each strain type.
Solution Approach 2:
The delivery system is designed to be dynamic and adaptive within the skin environment. The phage particles can infect different C. acnes strains encountered in situ, and the system naturally adjusts to the microbial population composition. This dynamic capability allows broad applicability across diverse microbiomes while maintaining a relatively simple core delivery mechanism.
Data Source
AI summary
The invention relates to C. acnes carrying DNA vectors with a C. acnes phage packaging signal and a gene of interest. The invention encompasses a C. acnes producer cell carrying DNA vectors, with a C. acnes phage packaging signal and a gene of interest, for the production of phage-derived particles that can robustly transduce C. acnes receiver cell allowing transgene expression. The invention encompasses C. acnes phage-derived particles carrying these vectors, C. acnes containing these vectors or modified by transduction of these phage-derived particles, and methods of using these phage-derived particles.