RNA Virus Attenuation via Codon Replacement for Vaccine Stability
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Solution Overview
Problem
Current methods for attenuating RNA viruses for vaccine production are empirical and specific to certain virus types, relying on random gene mutations or unnatural conditions, leading to genetic instability and the risk of reversion to a pathogenic phenotype, and lack a universal approach.
Innovation Solution
The attenuation of RNA viruses is achieved by modifying their mutational robustness through codon replacement, placing them in a precarious region of their genetic sequence space where mutations become lethal, using synonymous or non-synonymous codon substitutions that differ by only one nucleotide from a STOP codon, without affecting protein sequence or replication capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random gene mutation or passages in unnatural conditions are used to attenuate RNA viruses, then the virus is attenuated, but genetic instability and risk of reversion to pathogenic phenotype increase
Solution Approach 1:
The patent changes the nucleotide sequence parameters at codon positions while preserving amino acid sequences through synonymous codon substitutions. This creates a stable attenuated state by altering the genetic code's robustness properties without changing the protein product, thereby preventing reversion while maintaining attenuation.
Solution Approach 2:
The patent segments the genome into individual codon positions and selectively modifies specific codons (particularly at positions 1, 2, and 3) to reduce mutational robustness. This segmented approach allows precise control over which genetic positions contribute to attenuation stability versus pathogenicity risk.
2Reliability
If conventional empirical methods are used for RNA virus attenuation, then attenuation is achieved, but the method lacks universality and is specific to certain virus types
Solution Approach 1:
The patent creates a universal attenuation method that can be applied to any RNA virus by modifying codon sequences. The approach uses general principles of codon position modification and mutational robustness reduction that are applicable across different virus families, eliminating the need for virus-specific empirical optimization.
Solution Approach 2:
The patent changes fundamental parameters of the genetic code (codon-nucleotide relationships) rather than relying on virus-specific characteristics. By targeting universal properties of RNA replication and codon structure, the method achieves broad applicability across all RNA viruses while maintaining reliable attenuation.
3Reliability
If codon replacement is used to reduce mutational robustness, then the virus becomes hyper-sensitive to mutation, but the risk of introducing harmful factors increases
Solution Approach 1:
The patent converts the naturally high mutation rate of RNA viruses, which normally benefits viral evolution and pathogenicity, into a beneficial force for attenuation. By reducing mutational robustness through codon modification, the high mutation rate now generates lethal mutations rather than beneficial ones, turning the virus's evolutionary strength into its weakness.
Solution Approach 2:
The patent changes the threshold parameter for mutation tolerance by modifying codon sequences. This shifts the system from a state where mutations are tolerated (robust) to a state where mutations are lethal (sensitive), thereby converting the harmful potential of mutations into a beneficial attenuation mechanism.
Data Source
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AI summary
The application generally relates to the attenuation of a RNA virus or of a clone thereof and involves the alteration of sequence space, more particularly the reduction, of mutational robustness of said RNA virus or clone. The means of the application are more particularly dedicated to the attenuation of an infectious RNA virus or clone, for the production of immunogenic composition or vaccine. More particularly, the means of the application involve the replacement of codon(s) by different codon(s), which is(are) selected to differ by only one nucleotide from a codon STOP, more particularly by different but synonymous codon(s), which is(are) selected to differ by only one nucleotide from a codon STOP.