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B-cell and plasma-cell splicing differences: a potential role in regulated immunoglobulin RNA processing.
Shirley R Bruce1, R W Cameron Dingle, Martha L Peterson
1Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky College of Medicine, Lexington, Kentucky 40536, USA.
RNA (New York, N.Y.)
|September 18, 2003
Summary
B-lymphocyte development involves alternative processing of immunoglobulin micro pre-mRNA. RNA splicing activity differs between B cells and plasma cells, impacting IgM protein production.
Area of Science:
- Molecular Biology
- Immunology
- Gene Regulation
Background:
- Immunoglobulin micro pre-mRNA undergoes alternative 3' end processing via competing splice and cleavage-polyadenylation reactions.
- This processing generates distinct messenger RNA (mRNA) variants encoding membrane-associated or secreted IgM protein.
- Differential processing efficiency is observed during B-lymphocyte development, with higher cleavage-polyadenylation activity in antibody-secreting plasma cells compared to B cells.
Purpose of the Study:
- To investigate whether variations in RNA splicing activity contribute to the regulation of micro pre-mRNA processing during B-lymphocyte development.
- To elucidate the differences in the cellular splicing environments between B cells and plasma cells.
Main Methods:
- Demonstrated that micro pre-mRNA processing is sensitive to alterations in the splicing environment by coexpressing SR proteins.
- Analyzed splicing patterns of chimeric non-immunoglobulin genes in B-cell and plasma-cell lines to assess splicing differences independent of cleavage-polyadenylation.
- Evaluated splicing of genes dependent on exonic splice enhancers in B-cell versus plasma-cell lines.
Main Results:
- Micro pre-mRNA processing can be modulated by changes in the cellular splicing environment.
- Distinct splicing patterns were observed between B-cell and plasma-cell lines using chimeric genes, indicating differences in their splicing machinery.
- Genes relying on exonic splice enhancers showed higher splicing efficiency in B-cell lines compared to plasma-cell lines.
Conclusions:
- Significant differences exist in the splicing environments of B cells and plasma cells.
- Both cleavage-polyadenylation and splicing activities are likely modulated during B-lymphocyte development.
- These modulations are crucial for the proper regulation of alternative micro pre-mRNA processing pathways, ensuring correct IgM production.