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Mol Cell Biol. 1994 June; 14(6): 3800-3809

DNA recognition by splicing variants of the Wilms' tumor suppressor, WT1.

I A Drummond, H D Rupprecht, P Rohwer-Nutter, J M Lopez-Guisa, S L Madden, F J Rauscher 3rd and V P Sukhatme

Harvard Medical School, Department of Medicine, Beth Israel Hospital, Boston, Massachusetts 02215.

ABSTRACT

The Wilms' tumor suppressor, WT1, is a zinc finger transcriptional regulator which exists as multiple forms owing to alternative mRNA splicing. The most abundant splicing variants contain a nine-nucleotide insertion encoding lysine, threonine, and serine (KTS) in the H-C link region between the third and fourth WT1 zinc fingers which disrupts binding to a previously defined WT1-EGR1 binding site. We have identified WT1[+KTS] binding sites in the insulin-like growth factor II gene and show that WT1[+KTS] represses transcription from the insulin-like growth factor II P3 promoter. The highest affinity WT1[+KTS] DNA binding sites included nucleotide contacts involving all four WT1 zinc fingers. We also found that different subsets of three WT1 zinc fingers could bind to distinct DNA recognition elements. A tumor-associated, WT1 finger 3 deletion mutant was shown to bind to juxtaposed nucleotide triplets for the remaining zinc fingers 1, 2, and 4. The characterization of novel WT1 DNA recognition elements adds a new level of complexity to the potential gene regulatory activity of WT1. The results also present the possibility that altered DNA recognition by the dominant WT1 zinc finger 3 deletion mutant may contribute to tumorigenesis.

Mol Cell Biol. 1994 June; 14(6): 3800-3809




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