Differential regulation of mouse germline Ig gamma 1 and epsilon promoters by IL-4 and CD40
UMass Chan AffiliationsDepartment of Molecular Genetics and Microbiology
Document TypeJournal Article
KeywordsActivating Transcription Factor 2
Activating Transcription Factors
Basic-Leucine Zipper Transcription Factors
Cyclic AMP Response Element-Binding
G-Box Binding Factors
Gene Expression Regulation
Mice, Inbred BALB C
Mice, Inbred C57BL
Molecular Sequence Data
Promoter Regions (Genetics)
STAT6 Transcription Factor
Tumor Cells, Cultured
Medicine and Health Sciences
MetadataShow full item record
AbstractBefore Ig class switching, RNA transcription through the specific S regions undergoing recombination is induced by cytokines and other activators that induce and direct switching. The resulting germline (GL) transcripts are essential for switch recombination. To understand the differential regulation of mouse IgG1 and IgE, we compared the promoters for GL gamma1 and epsilon transcripts. We addressed the question of why the promoter that regulates GL epsilon transcription is more responsive to IL-4 than the gamma1 promoter and also why GL epsilon transcription is more dependent on IL-4 than is gamma1 transcription. We found that the IL-4-responsive region of the GL epsilon promoter is more inducible than that of the gamma1 promoter, although each promoter contains a binding site for the IL-4-inducible transcription factor Stat6, located immediately adjacent to a binding site for a basic region leucine zipper (bZip) family protein. However, the arrangement and sequences of the sites differ between the epsilon and gamma1 promoters. The GL epsilon promoter binds Stat6 with a 10-fold higher affinity than does the gamma1 promoter. Furthermore, the bZip elements of the two promoters bind different transcription factors, as the GL epsilon promoter binds and is activated by AP-1, whereas the gamma1 promoter binds and is activated by activating transcription factor 2. C/EBPbeta and C/EBPgamma also bind the gamma1 bZip element, although they inhibit rather than activate transcription. However, inhibition of promoter activity by C/EBPbeta does not require the bZip element and may instead occur via inhibiting the activity of NF-kappaB.
J Immunol. 2001 Aug 1;167(3):1522-34.
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/50660
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