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High-level expression of chimeric antibodies using adapted cDNA variable region cassettes.
S D Gillies1, K M Lo, J Wesolowski
1Damon Biotech, Inc., Needham Heights, MA 02194.
Journal of Immunological Methods
|December 20, 1989
Summary
Researchers developed a method to express antibody variable regions with different constant regions. This technique enables the creation of chimeric antibodies but identified a specific sequence that blocked RNA expression.
Area of Science:
- Immunology
- Molecular Biology
- Biotechnology
Background:
- Antibody engineering is crucial for developing targeted therapies.
- Expressing functional antibody variable regions with diverse constant regions presents challenges.
Purpose of the Study:
- To develop a versatile method for modifying immunoglobulin cDNAs.
- To enable the expression of antibody variable (V) regions as cassettes with various constant regions.
Main Methods:
- Isolated and sequenced murine immunoglobulin cDNAs.
- Joined V regions to oligonucleotides with splice donor and restriction sites.
- Inserted modified cDNAs into an expression vector for chimeric antibody production.
Main Results:
- Successfully expressed chimeric antibodies using murine V regions and a human gamma 1 constant region.
- Identified a specific murine light-chain cDNA sequence that prevented expression in hybridoma cells.
- Determined that the fusion of murine leader and V regions blocked expression at the RNA accumulation level.
Conclusions:
- The developed method provides a generally applicable strategy for antibody V region cassette expression.
- Potential expression blockages due to specific cDNA sequences should be considered in antibody engineering.
- The findings are relevant for both traditional cDNA fragments and in vitro amplified sequences.