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Applications of retrovirus-mediated expression cloning
M Onishi1, S Kinoshita, Y Morikawa
1DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304, USA.
Experimental Hematology
|February 1, 1996
Summary
Researchers developed a new retroviral vector system for expression cloning. This method efficiently transduces cDNAs into diverse cell types, enabling functional screening and mutation discovery.
Area of Science:
- Molecular Biology
- Genetics
- Virology
Background:
- Traditional expression cloning systems often require specific cell types like COS cells for transient transfection.
- Limitations exist in the efficiency and versatility of existing cDNA library transduction methods.
Purpose of the Study:
- To establish a novel and efficient expression cloning system utilizing retroviral vectors.
- To enable cDNA transduction into a broader range of cell types for functional analysis.
Main Methods:
- Development of a high-efficiency packaging cell line (BOSC23) and a simplified retroviral vector (pBabeX).
- Construction of cDNA libraries in the pBabeX vector and transient transfection into BOSC23 cells.
- Retroviral transduction of various cell lines, including NIH3T3 and hematopoietic cells, with high infection efficiency.
Main Results:
- The system generates retrovirus stocks with high titers (>3X10^6/mL), accommodating complex cDNA libraries.
- Achieved 100% infection efficiency in NIH3T3 cells and 5-40% in various hematopoietic cell lines.
- Demonstrated successful transduction of cDNAs into diverse cell types, overcoming limitations of conventional methods.
Conclusions:
- Retrovirus-mediated expression cloning offers a versatile platform for selecting cells expressing cDNAs of interest via functional assays.
- The system is applicable to diverse cell types, expanding the scope of expression cloning.
- Integration with PCR-driven random mutagenesis facilitates the search for functional mutations.