Adenoviral pIX Polypeptide Boosts Adenovirus Yield
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Solution Overview
Problem
The production of adenoviruses, particularly those with partial deletions in the E1 region, is hindered by low recombination efficiency and transfection efficiency in producer cells, leading to inefficient reconstitution and contamination issues, as well as biased libraries due to DNA rearrangements and selection of virus mutants.
Innovation Solution
Expressing the adenoviral pIX polypeptide using a combination of minimal endogenous and heterologous promoters in production cells to enhance the yield of replication-incompetent adenoviruses, thereby improving the production and assembly of adenoviruses with partial E1 deletions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adenoviruses with partial E1 deletions are produced using conventional methods, then replication-incompetent adenoviruses are generated, but the yield is low due to low recombination efficiency and transfection efficiency
Solution Approach 1:
The patent introduces an adenoviral pIX polypeptide as an intermediary factor to enhance virus assembly and production. The pIX polypeptide acts as a mediator that facilitates the assembly of viral particles from recombinant genomes, thereby improving both the recombination efficiency and the overall yield of replication-incompetent adenoviruses without requiring wild-type virus contamination
Solution Approach 2:
The patent modifies the production parameters by co-expressing the pIX polypeptide alongside the adenoviral elements. This parameter change (adding pIX expression) significantly increases the yield of adenoviruses by enhancing the assembly efficiency of viral particles from the recombinant genomes produced in the production cell
2Productivity
If conventional adenovirus production methods are used, then adenoviruses are generated, but contamination with wild-type virus occurs
Solution Approach 1:
The patent extracts and eliminates the harmful element (wild-type virus contamination) by using a production system that relies on co-expression of pIX polypeptide with recombinant adenoviral elements. This approach generates replication-incompetent adenoviruses without requiring the introduction of wild-type virus, thereby taking out the source of contamination from the production process
3Adaptability or versatility
If adenovirus libraries are constructed using traditional methods, then virus libraries are generated, but bias occurs due to DNA rearrangements and selection of virus mutants
Solution Approach 1:
The pIX polypeptide serves as an intermediary that enhances the assembly of diverse recombinant adenoviral genomes into functional viral particles. This mediation process reduces bias by ensuring that different recombinant genomes are assembled with equal efficiency, preventing the selection of specific virus mutants and maintaining the representativeness of the original library composition
Data Source
AI summary
The invention relates to a method for increasing the yield of replication-incompetent adenoviruses having at least a partial deletion in the E1-region, wherein the adenoviruses are generated in a production cell by: (a) expressing an adenoviral pIX polypeptide from a nucleic acid sequence encoding adenoviral pIX polypeptide under the control of at least a minimal endogenous pIX promoter and a heterologous promoter; and (b) expressing the elements necessary for the production and assembly of the adenoviruses, thereby increasing the yield of adenoviruses generated in the production cell in comparison to the yield in the absence of nucleic acid sequence encoding the adenoviral pIX polypeptide. Further, the invention relates to a method for constructing an adenovirus library, a production cell, and the use of an adenoviral pIX polypeptide for increasing the yield of replication-incompetent adenoviruses having at least a partial deletion in the E1-region.