Synonymous Codon Mutation for Ribosome Traffic Management
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Solution Overview
Problem
Current methods for improving heterologous protein production in host cells often disrupt cellular balance and can lead to decreased host fitness due to competition for finite resources like ribosomes, resulting in reduced protein synthesis and potential cell growth halt.
Innovation Solution
Introducing synonymous mutations that modify codon translation rates, where slower translating codons increase replicative fitness and faster translating codons decrease it, thereby optimizing ribosome allocation and reducing ribosome backups, thus enhancing protein production without significant loss in translation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synonymous mutations are introduced to optimize heterologous gene expression, then protein production increases, but host fitness decreases due to resource competition
Solution Approach 1:
The patent applies local quality by making specific synonymous mutations at particular codon positions in the heterologous gene rather than uniformly optimizing all codons. This localized approach modifies translation rates at specific sites to reduce ribosome backups and improve host fitness while maintaining overall protein production capacity.
Solution Approach 2:
The patent changes the translation rate parameter by introducing synonymous mutations that alter codon usage. This parameter change optimizes the balance between heterologous protein production and host cell function by adjusting how quickly ribosomes translate specific regions of the gene, thereby managing resource competition.
2Productivity
If faster translating codons are used to increase protein production rate, then translation efficiency improves, but ribosome backups increase and host fitness decreases
Solution Approach 1:
The patent applies inversion by using slower translating codons in certain positions rather than faster ones. This counterintuitive approach prevents ribosome backups and traffic jams on the mRNA, ensuring smooth ribosome flow and maintaining host fitness while still achieving adequate protein production.
Solution Approach 2:
The patent introduces dynamic variation in translation rates through synonymous mutations at different codon positions. By creating a non-uniform translation profile with alternating fast and slow regions, the system optimizes ribosome flow dynamics to prevent backups while maintaining overall production efficiency.
3Productivity
If synonymous mutations modify codon translation rates, then ribosome allocation is optimized, but the complexity of gene design increases
Solution Approach 1:
The patent uses parameter changes by systematically varying codon usage at specific positions based on translation rate considerations. This approach optimizes ribosome allocation through controlled changes in codon selection rules, balancing design complexity with functional improvement.
Data Source
AI summary
Genetically modified cells with at least one codon substituted to a synonymous codon, and with modified replicative fitness as compared to the unmodified cell, wherein a slower translating synonymous codon increases replicative fitness and a faster translating codon decreased replicative fitness are provided. Further, vaccine composition comprising those cells as well as methods for modifying replicative fitness of a cell are provided.