Codon Optimization for Protein Homogeneity
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Solution Overview
Problem
Current methods in biopharmaceutical production face challenges in achieving high fidelity transcription and translation of polynucleotide sequences, leading to heterogeneity in protein products due to amino acid residue misincorporations, which affect therapeutic efficacy and immunogenicity, particularly in protein therapeutics and biosimilar development.
Innovation Solution
A method is developed to optimize coding sequences by identifying and altering codons susceptible to amino acid residue misincorporation, matching the degree or type of misincorporation found in a reference polypeptide, thereby reducing immunogenic potential and improving protein homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard coding sequences are used for protein expression, then production efficiency is maintained, but amino acid residue misincorporations occur leading to product heterogeneity
Solution Approach 1:
The patent applies parameter changes by systematically modifying codon parameters in the coding sequence. Specifically, it changes the third nucleotide position of codons (the wobble position) to create alternative coding sequences that encode the same amino acid sequence but reduce susceptibility to misincorporation. This parameter modification resolves the contradiction by improving amino acid sequence fidelity without affecting the overall protein production efficiency, as the modified sequences still encode the identical polypeptide.
2Stability of the object's composition
If coding sequences are optimized to reduce misincorporation, then product homogeneity improves, but sequence design complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the coding sequence into individual codons and analyzing each codon's susceptibility to misincorporation independently. The method segments the optimization process into systematic evaluation of each amino acid position, allowing identification of specific codons that are prone to errors. This segmented approach improves protein product homogeneity while managing design complexity through a methodical, position-by-position optimization strategy rather than attempting to redesign the entire sequence simultaneously.
Solution Approach 2:
The patent employs feedback mechanisms by using mass spectrometry to detect actual amino acid misincorporations in expressed proteins, then using this information to guide further codon optimization. The feedback loop involves: (1) expressing the protein, (2) analyzing misincorporation patterns via mass spectrometry, (3) identifying problematic codons, and (4) refining the coding sequence accordingly. This feedback-driven approach ensures high product homogeneity while keeping the design process manageable through iterative improvement based on empirical data.
3Object-affected harmful factors
If codons are changed to reduce misincorporation susceptibility, then immunogenicity decreases, but purification requirements increase
Solution Approach 1:
The patent converts the potential harm of sequence variants into a benefit by using the optimized coding sequence to produce a more homogeneous protein product with reduced immunogenicity. By systematically reducing misincorporation events through codon optimization, the method converts what would otherwise be harmful sequence variants into a benefit: a cleaner, more consistent product that requires less extensive purification and poses lower immunogenic risk. The approach transforms the challenge of sequence heterogeneity into an opportunity for improved product quality.
Data Source
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AI summary
Amino acid residue misincorporations are necessarily found in sequence variants at low concentrations in admixture with expressed polypeptides, resulting from one or more base mismatches within codons susceptible to amino acid residue misincorporation during transcription and/or translation. The invention provides a method of optimizing the coding sequences of a polynucleotide that encodes a polypeptide, wherein at least one codon is susceptible to amino acid residue misincorporation. The method of the invention can be used to reverse-engineer an unknown coding sequence, which encodes the same polypeptide, but differs in said at least one codon from the known coding sequence. The method can further be used to alter the immunogenic potential of an expressed polypeptide. Thus, the invention is useful inengineering optimized polynucleotides encoding polypeptides.