Transcriptional repression of human insulin-like growth factor-II P4 promoter by Wilms' tumor suppressor WT1

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Title
Transcriptional repression of human insulin-like growth factor-II P4 promoter by Wilms' tumor suppressor WT1
Author(s)
Young Ik Lee; Seong-Jin Kim
Bibliographic Citation
Dna and Cell Biology, vol. 15, no. 2, pp. 99-104
Publication Year
1996
Abstract
The Wilms' tumor suppressor gene wt1 encodes a zinc finger-containing protein that binds to the same DNA sequence as Egr-1, a mitogen-inducible immediate-early gene product that activates transcription. In this study, we investigated whether the human insulin-like growth factor-II (IGF-II) P4 promoter might be a target for transcriptional repression mediated by WT1. Using constructs of the IGF-II P4 promoter linked to the chloramphenicol acetyltransferase gene, we have demonstrated that the WT1 protein represses expression of the IGF-II gene through a GCGGGGGAG response element spanning nucleotides -87 to -65 of the IGF-II P4 promoter. Conversely, we have shown that the Egr-1 activates transcription of the IGF-II gene through the same response element. WT1 and Egr-1 proteins interact directly with the WT1/Egr- 1 response element of the IGF-II promoter 4 in gel mobility-shift assays. These findings demonstrate the importance of the WT1/Egr-1 consensus element for the expression of the IGF-II gene in response to positive or negative transcription signals.
ISSN
1044-5498
Publisher
Mary Ann Liebert, Inc
DOI
http://dx.doi.org/10.1089/dna.1996.15.99
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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