Codon Frequency Matching for Higher Polypeptide Expression
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Solution Overview
Problem
Existing methods for expressing polypeptides in cells face inefficiencies due to variations in codon usage frequencies, leading to suboptimal protein production levels.
Innovation Solution
A method involving the use of polypeptide encoding nucleic acids where each amino acid is encoded by a group of codons with specific usage frequencies matching those in the host cell genome, ensuring the overall usage frequency of each codon in the nucleic acid aligns with its group frequency, thereby optimizing codon usage for enhanced expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard nucleic acid sequences are used for polypeptide expression, then the expression system is simple and easy to implement, but the polypeptide expression levels are suboptimal due to codon usage variations
Solution Approach 1:
The patent applies parameter changes by optimizing codon usage frequencies in the nucleic acid sequence to match host cell preferences. Specifically, it adjusts the frequency of different codons encoding the same amino acid to align with the host organism's natural codon usage patterns, thereby improving translation efficiency and polypeptide expression levels without changing the amino acid sequence itself.
Solution Approach 2:
The patent implements local quality by applying different codon selection strategies to different regions or contexts within the nucleic acid sequence. It considers local factors such as adjacent codons, RNA secondary structure potential, and regional codon usage biases to optimize expression, rather than applying a uniform codon optimization approach throughout the entire sequence.
2Productivity
If codon usage is optimized to match host cell preferences, then polypeptide production efficiency is enhanced, but the design and implementation of the nucleic acid sequence becomes more complex
Solution Approach 1:
The patent systematically changes codon parameters by selecting specific codons based on quantitative usage frequency data from the host organism's genome. It transforms the nucleic acid sequence to use codons that appear more frequently in the host's natural genes, thereby optimizing the translation process and enhancing polypeptide production efficiency through data-driven parameter adjustment.
Solution Approach 2:
The patent employs self-service by utilizing the host cell's own codon usage statistics and translation machinery to optimize foreign gene expression. Instead of imposing an external optimization scheme, it allows the host's natural codon preferences to guide the selection of codons in the recombinant nucleic acid sequence, making the expression system self-adapting to host conditions.
3Device complexity
If uniform codon selection is used throughout the nucleic acid sequence, then the design process is simplified, but translation dynamics and expression optimization are compromised
Solution Approach 1:
The patent applies local quality by implementing context-dependent codon selection where different codons are chosen based on their local environment within the sequence. It considers factors such as the identity of adjacent codons, local RNA structure requirements, and position-specific expression needs, thereby creating a non-uniform but optimized codon distribution that enhances translation efficiency throughout the gene.
Solution Approach 2:
The patent introduces dynamics into the codon selection strategy by allowing flexible codon choice that can adapt to different regions of the gene and different expression conditions. Rather than fixing a single codon for each amino acid throughout the sequence, it enables dynamic selection from multiple codon options based on local optimization criteria, improving overall translation efficiency.
Data Source
AI summary
Herein is reported a method for recombinantly producing a polypeptide in a cell comprising the step of cultivating a cell which comprises a nucleic acid encoding the polypeptide, and recovering the polypeptide from the cell or the cultivation medium, wherein each of the amino acid residues of the polypeptide is encoded by at least one codon, whereby the different codons encoding the same amino acid residue are combined in one group and each of the codons in a group is defined by a specific usage frequency within the group, whereby the sum of the specific usage frequencies of all codons in one group is 100%, and wherein the usage frequency of a codon in the polypeptide encoding nucleic acid is about the same as its specific usage frequency within its group.