Altered Host Cells for Enhanced Genetic Transformation
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Solution Overview
Problem
Microbial hosts vary in their ability to transfer genetic molecules, with genes not always being expressed and enzymes functioning differently across hosts, leading to compatibility issues in production processes, and the need for platform strains that can enhance metabolic engineering strategies.
Innovation Solution
Nonnaturally occurring hosts are altered by deleting endogenous target loci, such as endonuclease loci, to increase transformation and electroporation efficiency, allowing for genomic integration of exogenous DNA sequences, and identifying inhibitory loci to enhance transformation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If endogenous target loci are deleted to increase transformation efficiency, then genetic molecule transfer ability is improved, but host genome complexity is reduced
Solution Approach 1:
The patent applies the 'Taking out' principle by removing specific endogenous target loci (such as endonuclease genes like h16_a0006-9) from the host genome that interfere with transformation efficiency. This extraction of harmful genetic elements enables significantly improved genetic molecule transfer capability while maintaining the essential functional complexity of the host organism for biochemical production.
2Productivity
If multiple endogenous loci are modified to enhance transformation efficiency, then genetic molecule transfer ability is improved, but host functionality may be compromised
Solution Approach 1:
The patent applies the 'Local quality' principle by making targeted, localized modifications to specific endogenous loci rather than global genome alterations. By focusing modifications on particular interference sites (such as specific endonuclease genes) while preserving the rest of the host genome, the invention achieves improved transformation efficiency while maintaining host functionality and reliability for biochemical production.
3Adaptability or versatility
If host engineering is performed to increase transformation efficiency, then metabolic engineering capability is improved, but process complexity increases
Solution Approach 1:
The patent applies the 'Preliminary action' principle by pre-modifying host strains to have enhanced transformation efficiency before metabolic engineering applications. By performing the host engineering step upfront (creating strains like the modified C. necator H16), subsequent metabolic engineering experiments can proceed more efficiently without requiring repeated complex transformation protocols, thereby reducing overall process complexity while maintaining versatility.
Data Source
AI summary
Nonnaturally occurring host cells altered to increase their ability to transfer genetic molecules into the host cells as compared to an unaltered host cell are provided. Also provided are methods for identifying endogenous loci of a host cell which inhibit transformation efficiency and/or electroporation of genetic molecules into the cell as well as methods for producing nonnaturally occurring host cells with enhanced transformation efficiency and/or the modified ability to allow for genomic integration of an exogenous DNA sequence via electroporation. Methods for producing biochemicals and products produced with the nonnaturally occurring host cells are also provided.