CHO Cell Knockout for Recombinant Protein Purity
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Solution Overview
Problem
Current methods for producing recombinant proteins in CHO cells face limitations due to the production of endogenous host cell proteins, which can contaminate recombinant protein preparations and hinder high-yield production, and there is a need for cells capable of higher cell density to enhance protein production.
Innovation Solution
Modifying CHO cells by disrupting the expression of specific endogenous proteins such as TIMP1, NID1-1, NID1-2, and LGALS3BP through knockout or knockdown techniques, allowing for increased recombinant protein production by reducing resource allocation to these proteins and improving cell density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CHO cells are used to produce recombinant proteins, then production capability is achieved, but endogenous host cell proteins contaminate the recombinant protein preparation
Solution Approach 1:
The patent applies the 'Taking out' principle by selectively removing specific endogenous host cell proteins (TIMP1, NID1-1, NID1-2, and LGALS3BP) through gene knockout or knockdown techniques. This extraction of harmful components directly reduces contamination in recombinant protein preparations while maintaining the productive capabilities of CHO cells.
Solution Approach 2:
The patent modifies the cellular parameters by altering the expression levels of specific endogenous proteins through genetic engineering. By changing the presence or abundance of these host cell proteins, the patent optimizes the balance between maintaining cell functionality and reducing contamination, thereby improving preparation purity.
2Productivity
If resources are allocated to produce endogenous proteins, then cellular functions are maintained, but recombinant protein production yield is limited
Solution Approach 1:
By removing the genetic capability to produce specific endogenous proteins through knockout techniques, the patent eliminates the waste of cellular resources on these non-essential proteins. This extraction redirects metabolic energy and resources toward recombinant protein synthesis, thereby increasing overall productivity.
Solution Approach 2:
The patent changes the resource allocation parameters within the cell by modulating the expression levels of endogenous proteins. This parameter modification optimizes the distribution of cellular resources, ensuring that more energy and materials are directed toward recombinant protein production rather than being consumed by endogenous protein synthesis.
3Productivity
If cell density is increased to enhance protein production, then total yield improves, but difficulty in completely removing endogenous proteins from media increases
Solution Approach 1:
The patent proactively extracts and eliminates the source of contamination (endogenous proteins) at the genetic level before purification is needed. By knocking out the genes encoding these proteins, the patent simplifies downstream purification processes while maintaining high cell density cultures, as there are fewer contaminants to remove.
Solution Approach 2:
The patent performs preliminary action by genetically modifying the cells to reduce endogenous protein production before the purification step. This preventive measure is taken in advance of the actual protein production and purification process, making the subsequent removal of contaminants easier and less complex.
Data Source
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AI summary
The present invention relates to mammalian cells modified to provide for improved expression of a recombinant protein of interest. In particular, the invention relates to CHO cells and other host cells in which the expression of one or more endogenous secreted proteins has been disrupted, as well as to the preparation, identification and use of such cells in the production of recombinant proteins.