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Hybridoma fusion cell lines contain an aberrant kappa transcript
W L Carroll1, E Mendel, S Levy
1Department of Medicine, Stanford University School of Medicine, CA 94305.
Molecular Immunology
|October 1, 1988
Summary
Researchers identified a non-productive kappa transcript in myeloma fusion partners with an aberrant VJ recombination site. This aberrant transcript, leading to a translation stop, is variably expressed and can exceed productive light chain mRNA levels.
Area of Science:
- Immunogenetics
- Molecular Biology
- Myeloma Research
Background:
- Myeloma fusion partners are crucial for hybridoma production.
- Kappa light chain transcripts are essential for B-cell receptor function.
- Aberrant gene rearrangements can lead to non-functional proteins.
Purpose of the Study:
- To determine the V region sequence of a non-productive kappa transcript.
- To investigate the nature of the aberrant VJ recombination site.
- To assess the expression levels of this transcript in hybridomas.
Main Methods:
- Sequencing of the V region of the kappa transcript.
- Analysis of VJ recombination sites.
- Quantitative analysis of mRNA expression in hybridomas.
Main Results:
- The V region sequence of a non-productive kappa transcript was determined.
- An aberrant VJ recombination site was identified, creating a translation stop at position 105.
- Variable expression of this transcript was observed in hybridomas from MOPC-21 tumor fusion partners.
- The non-productive transcript levels can surpass those of the productive light chain mRNA.
Conclusions:
- Aberrant VJ recombination in kappa transcripts can lead to non-functional proteins.
- The identified non-productive transcript is consistently generated in specific myeloma fusion partners.
- The high expression of non-productive transcripts may have implications for B-cell development and function in myeloma.