Expression of I mu-C gamma hybrid germline transcripts subsequent to immunoglobulin heavy chain class switching.

Abstract:

:Germline CH transcripts initiate from a non-coding I exon and terminate downstream of the associated CH exons. Ig heavy chain class switch recombination from the VDJ-C mu gene to particular downstream CH genes appears to be regulated by a process that involves mitogen and/or cytokine induction of germline CH transcripts from the downstream genes. We have examined the expression of germline C mu transcripts (I mu-C mu transcripts) in splenic B cells and pre-B cell lines after cytokine and mitogen stimulation. In contrast to the expression of the germline transcripts from downstream CH genes, expression of germline C mu transcripts was constitutive and unaffected by mitogen and cytokine treatment. After a primary switch recombination event, the germline I mu promoter, which is now associated with a downstream CH gene, continues to be active--leading to the generation of a novel germline transcript consisting of the I mu exon spliced to the CH exons of the switched CH gene. We discuss the potential role of the expression of hybrid I mu-containing transcripts in the class switch process. We also describe a novel and sensitive assay, based on the detection of the hybrid I mu-containing transcripts, that allows detection of class switch recombination events even in heterogeneous populations of cells.

journal_name

Int Immunol

journal_title

International immunology

authors

Li SC,Rothman PB,Zhang J,Chan C,Hirsh D,Alt FW

doi

10.1093/intimm/6.4.491

subject

Has Abstract

pub_date

1994-04-01 00:00:00

pages

491-7

issue

4

eissn

0953-8178

issn

1460-2377

journal_volume

6

pub_type

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