Baculovirus Homologous Recombination for Stable Multi-Gene Expression
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Solution Overview
Problem
Existing baculovirus expression systems face challenges in producing homogeneous and stable recombinant proteins comprising several distinct subunits, such as antibodies or pairs of viral proteins, due to complex and inefficient processes that hinder industrial scalability.
Innovation Solution
A process involving a replication-deficient baculovirus genome and transfer vectors that restore essential viral replication functions through homologous recombination, allowing simultaneous integration of multiple exogenous genes in a single step, resulting in homogeneous and stable recombinant baculoviruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional processes are used for producing recombinant baculoviruses with multiple exogenous genes, then the production of recombinant proteins comprising several distinct subunits is achieved, but the process complexity increases and homogeneity and stability of the recombinant baculovirus genomes deteriorate
Solution Approach 1:
The patent divides the complex process of producing recombinant baculoviruses with multiple exogenous genes into distinct functional modules: (1) a replication-deficient baculovirus genome containing multiple essential gene loci, and (2) multiple transfer vectors each carrying one exogenous gene and flanking sequences homologous to the viral genome. This segmentation allows each component to be independently designed and optimized, reducing overall process complexity while enabling production of multi-subunit proteins.
Solution Approach 2:
The patent performs preliminary actions by pre-designing the replication-deficient baculovirus genome with multiple essential gene loci that have flanking sequences suitable for recombination, and by preparing transfer vectors with homologous flanking sequences before the actual recombination event. This preliminary preparation enables direct homologous recombination in insect cells without requiring complex multi-step cloning procedures, thereby simplifying the overall process while maintaining the ability to produce recombinant proteins with several distinct subunits.
2Adaptability or versatility
If traditional processes are used for producing recombinant baculoviruses with multiple exogenous genes, then the production of recombinant proteins comprising several distinct subunits is achieved, but the homogeneity and stability of recombinant baculovirus genomes deteriorate
Solution Approach 1:
The patent ensures homogeneity of the recombinant baculovirus genomes by designing all transfer vectors with flanking sequences that are strictly homologous to the corresponding regions in the replication-deficient baculovirus genome. This homology ensures that recombination occurs at precise, predetermined locations, guaranteeing that all resulting recombinant viruses have identical genome structures and gene arrangements, thereby maintaining high homogeneity and stability essential for industrial production of multi-subunit proteins.
3Quantity of substance
If complex processes are used for producing recombinant baculoviruses, then multiple exogenous genes can be integrated, but the ease of implementation and industrial scalability worsen
Solution Approach 1:
The patent merges the functions of multiple separate cloning steps into a single homologous recombination event in insect cells. By combining the replication-deficient baculovirus genome and multiple transfer vectors containing different exogenous genes into the same insect cell culture, all recombination events occur simultaneously in one step, eliminating the need for sequential cloning operations. This merging dramatically simplifies the manufacturing process while maintaining the ability to integrate multiple exogenous genes, thereby improving ease of implementation and industrial scalability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient production of recombinant baculoviruses that express multiple exogenous polypeptides, including proteins with distinct subunits, by ensuring high homogeneity and stability, facilitating industrial-scale production.
Implementation Method 1
A process for the preparation of a recombinant baculovirus comprising n exogenous genes, by recombination between: a replication-deficient baculovirus genome in which n genes essential for viral replication are non-functional; and n transfer vectors each comprising: i) a nucleotide sequence that restores the function of one of the n non-functional genes essential for viral replication
Data Source
AI summary
The invention relates to a method for producing a recombinant baculovirus comprising n exogenous genes in an insect cell, by means of homologous recombination of a replication-deficient baculovirus genome and n transfer vectors, each comprising one of the n exogenous genes, n being an integer at least equal to 2.