A Nonimmunoglobulin Transgene and the Endogenous Immunoglobulin Mu Gene Are Coordinately Regulated by Alternative RNA Processing During B-cell Maturation

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 1998 Feb 3

PMID 9448001

Citations 12

Authors

R L Seipelt

B T Spear

E C Snow

M L Peterson

Affiliations

Soon will be listed here.

Abstract

The immunoglobulin (Ig) genes have been extensively studied as model systems for developmentally regulated alternative RNA processing. Transcripts from these genes are alternatively processed at their 3' ends to yield a transcript that is either cleaved and polyadenylated at a site within an intron or spliced to remove the poly(A) site and subsequently cleaved and polyadenylated at a downstream site. Results obtained from expressing modified genes in established tissue culture cell lines that represent different stages of B-lymphocyte maturation have suggested that the only requirement for regulation is that a pre-mRNA contain competing cleavage-polyadenylation and splice reactions whose efficiencies are balanced. Since several non-Ig genes modified to have an Ig gene-like structure are regulated in cell lines, Ig-specific sequences are not essential for this control. This strongly implies that changes in the amounts or activities of general RNA processing components mediate the processing regulation. Despite numerous studies in cell lines, this model of Ig gene regulation has never been tested in vivo during normal lymphocyte maturation. We have now introduced a non-Ig gene with an Ig gene-like structure into the mouse germ line and demonstrate that RNA from the transgene is alternatively processed and regulated in murine splenic B cells. This establishes that the balance and arrangement of competing cleavage-polyadenylation reactions are sufficient for RNA processing regulation during normal B-lymphocyte development. These experiments also validate the use of tissue culture cell lines for studies of Ig processing regulation. This is the first transgenic mouse produced to test a specific model for regulated mRNA processing.

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