FTH1 Gene Screening for Stable Cell Line Establishment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for establishing stable cell lines for recombinant protein production are labor-intensive, time-consuming, and require extensive screening to identify cell lines with high expression levels of target proteins.
Innovation Solution
A method involving the use of an expression vector containing a promoter, a gene encoding a target protein, and an FTH1 gene, which is transfected into host cells and cultured in a medium with added iron ions to screen for cells expressing the target protein and establishing a stable cell line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional selectable marker genes (e.g., neomycin phosphotransferase) are used for screening, then stable cell lines can be established, but the screening process becomes labor-intensive, time-consuming, and expensive
Solution Approach 1:
The patent employs a colorimetric screening system where the target protein or associated marker produces a detectable color change. This allows rapid visual identification of successfully transfected cells without lengthy conventional screening processes, directly reducing screening time while maintaining reliability of stable cell line establishment
Solution Approach 2:
The patent replaces manual, labor-intensive screening methods with an automated detection system based on colorimetric or fluorescent signals. This substitution of mechanical/manual operations with automated optical detection significantly reduces both time and labor requirements while improving screening consistency
2Productivity
If gene amplification techniques (e.g., DHFR-based system) are used to improve productivity, then recombinant protein production increases, but subsequent screening of high-productivity cells remains highly labor-intensive and time-consuming
Solution Approach 1:
The patent incorporates the screening marker and detection system into the expression vector during initial construction, so that screening capability is built-in from the start. This preliminary integration eliminates the need for separate, complex screening steps after gene amplification, making the process easier to operate while maintaining high productivity
3Measurement precision
If multiple cell lines are examined and tested to identify high-expression cell lines, then pure cell lines with high heterologous gene expression can be identified, but the process becomes time-consuming, labor-intensive, and expensive
Solution Approach 1:
The patent uses colorimetric or fluorescent markers that provide immediate visual feedback on expression levels. This allows rapid assessment of multiple cell lines simultaneously with high precision, eliminating the need for complex, time-consuming individual testing of each cell line while maintaining accurate detection of expression levels
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 method allows for the rapid identification and establishment of stable cell lines with high expression levels of target proteins, improving the efficiency and cost-effectiveness of recombinant protein production.
Implementation Method 1
FTH1 (Ferritin Heavy Chain 1) gene... adding iron ions to the medium, and screening the surviving host cells to obtain the host cells expressing the target protein
Data Source
AI summary
A method for screening host cells expressing a target protein is provided. The method includes the following steps: providing an expression vector, the expression vector including a promoter, a gene encoding a target protein and an FTH1 gene; transfecting the host cells with the expression vector; culturing the host cells in a medium; and adding iron ions to the medium, and screening the surviving host cells to obtain the host cells expressing the target protein. An expression vector and a method for establishing a cell line stably expressing an exogenous recombinant gene are also provided.