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. 1990 Oct;10(10):5340–5348. doi: 10.1128/mcb.10.10.5340

Parameters that govern the regulation of immunoglobulin delta heavy-chain gene expression.

R Tisch 1, N Kondo 1, N Hozumi 1
PMCID: PMC361229  PMID: 2118995

Abstract

The mu and delta immunoglobulin heavy-chain genes comprise a complex transcriptional unit in which a single mRNA precursor gives rise to mu- and delta-specific transcripts. During the immature B-cell stage, posttranscriptional processing events involving alternate splicing and cleavage-polyadenylation site selection give rise to mu- but not delta-encoding transcripts. In terminally differentiated B cells, delta mRNA is not synthesized because of a transcription termination event occurring upstream of the delta-gene locus. In an attempt to gain insight into the respective contributions of alternate splicing and cleavage-polyadenylation in the control of delta mRNA synthesis, we have constructed a set of plasmids in which membrane mu (mu m)-delta intergenic sequences containing the mu m poly(A) site but differing in splicing capacity were inserted in between a VH and delta gene. The mu m-delta insertion vectors were transfected into a B lymphoma line representative of an immature stage, and proximal mu m poly(A) site usage and delta mRNA synthesis were assessed. To determine unequivocally whether the mu m-delta intergenic region can regulate termination, the insertion vectors were also transfected into a B myeloma line, and transcription through the region was measured. In immature B-cell transfectants, splicing site selection was found to have a key role in determining poly(A) site utilization and concomitant delta mRNA expression. Mature delta mRNA synthesis was blocked by an upstream cleavage-polyadenylation event only when the proximal poly(A) site was associated with appropriate splicing signals. Furthermore, in vitro transcription assays revealed that the mu m-delta intergenic region is sufficient to regulate transcription termination within a 1,2430-base-pair region containing the mu m poly(A) site in myeloma transfectants. The mu m-delta insertion vectors provide an excellent model system for studying the regulatory aspects of this transcription termination event.

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Selected References

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