Adapted Enterovirus D68 Propagation in Vero Cells
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Solution Overview
Problem
Conventional methods fail to adapt and propagate Enterovirus D68 in Vero cells, a recommended cell substrate for vaccine production, and lack effective compositions for vaccine or diagnostic tools against this emerging virus.
Innovation Solution
The method involves adapting Enterovirus D68 to propagate in Vero cells by infecting the virus at specific temperatures and dilutions, and using mutated nucleic acid sequences to create a strain suitable for vaccine production and diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Enterovirus D68 is propagated using conventional methods, then the virus can be maintained in its original form, but it fails to propagate in Vero cells which are recommended for vaccine production
Solution Approach 1:
The patent applies parameter changes by modifying the viral genome sequence to enable propagation in Vero cells. Specific nucleotide substitutions are introduced into the Enterovirus D68 genome, particularly in the 3Dpol region, to adapt the virus to replicate efficiently in Vero cells while maintaining its immunogenic properties for vaccine production.
2Productivity
If Enterovirus D68 is adapted to propagate in Vero cells through genetic modification, then high-titer production is achieved, but the viral sequence is altered from the original strain
Solution Approach 1:
Controlled genetic modifications are made to the viral genome to achieve high-titer production in Vero cells. The modifications include specific nucleotide substitutions that enhance replication efficiency without fundamentally altering the viral antigenic properties, thus balancing productivity with compositional stability.
Solution Approach 2:
Instead of complete viral adaptation which might compromise sequence integrity, the patent applies partial adaptation through targeted mutations in specific genomic regions. This allows sufficient propagation in Vero cells to achieve high titers while preserving the essential viral characteristics needed for vaccine efficacy.
3Ease of manufacture
If conventional detection methods are used for Enterovirus D68, then existing diagnostic protocols can be maintained, but effective vaccine compositions and diagnostic tools are not available
Solution Approach 1:
The patent performs preliminary adaptation of the virus to Vero cells before vaccine production, establishing a reliable production system in advance. This preliminary action includes characterizing the adapted virus, validating its propagation characteristics, and ensuring its suitability for both vaccine manufacturing and diagnostic applications.
Solution Approach 2:
The adapted Enterovirus D68 strain serves multiple functions: it can be propagated efficiently in Vero cells for vaccine production, used as an antigen for vaccine formulation, and applied as a diagnostic tool. This multi-functionality simplifies the overall process by using a single adapted strain for multiple purposes.
Data Source
AI summary
Provided is an Enterovirus D68 adapted to propagate to high titers in Vero cells and method of adaptation thereof. Also provided is a suitable vaccine composition including inactivated Enterovirus D68 antigen.