Stable Avian Oviduct Cell Lines for Heterologous Protein Production
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Solution Overview
Problem
Current methods for producing heterologous proteins in avian oviduct cells are limited by the short lifespan of primary cultures, which makes them unsuitable for large-scale in vitro production, as cells typically die or differentiate within three days, leading to inadequate production of egg white proteins.
Innovation Solution
The development of stable avian cell lines by fusing immortal cells with avian oviduct cells, using oviduct-specific promoters to facilitate transcription and sustain protein production for extended passages, allowing for the production of pharmaceutical and therapeutic proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If primary cultures of avian oviduct cells are used for heterologous protein production, then the cells can initially produce egg white proteins, but the cells die or differentiate within three days making them unsuitable for large-scale production
Solution Approach 1:
The patent combines primary avian oviduct cells with immortalized cell lines to create hybrid cell lines that inherit both the protein production capability of oviduct cells and the extended lifespan of immortalized cells. This merging resolves the contradiction by integrating the beneficial properties of both cell types into a single functional system that can produce heterologous proteins continuously.
Solution Approach 2:
The patent performs preliminary immortalization of oviduct cells through fusion with immortalized cell lines before attempting large-scale protein production. This preliminary action extends the cell lifespan in advance, ensuring that cells remain viable and productive throughout the extended culture period required for commercial protein production.
2Productivity
If transgenic hens are used to express heterologous proteins in oviduct cells, then large amounts of proteins can be produced, but the method is complex and requires generation of transgenic animals
Solution Approach 1:
The patent extracts the protein production function from the complex transgenic animal system and concentrates it in isolated oviduct cell lines. By taking out the essential protein synthesis capability and separating it from the animal organism, the method achieves high protein yields without requiring the complex processes of transgenic animal generation, breeding, and egg collection.
Solution Approach 2:
The patent creates in vitro copies of the protein production system using cell lines that replicate the oviduct's natural protein synthesis machinery. These cell line copies can be expanded and maintained in culture without requiring living animals, providing a simplified alternative that maintains high productivity while eliminating animal-related complexity.
3Ease of manufacture
If primary oviduct cells are cultured to produce heterologous proteins, then the cells can be obtained from mature hens, but the cells typically die or differentiate within three days
Solution Approach 1:
The patent merges primary oviduct cells with immortalized cell lines to create hybrid cells that maintain the ease of isolation from mature hens while gaining enhanced viability. The immortalized cells provide survival signals and metabolic support that prevent differentiation and death, allowing the easily isolated primary cells to remain viable indefinitely in culture.
Data Source
AI summary
The present invention relates to cells that can be passaged in culture and can be used for, among other things, promoter assays and the production of heterologous proteins.