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J. Biol. Chem., Vol. 276, Issue 20, 16817-16823, May 18, 2001
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From the Department of Biochemistry and Molecular Biology, the
University of Texas M. D. Anderson Cancer Center,
Houston, Texas 77030
The product of the Wilms' tumor gene,
WT1, is essential for male sex determination and
differentiation in mammals. In addition to causing Wilms' tumor,
mutations in WT1 often cause two distinct but overlapping
urogenital defects in men, Denys-Drash syndrome and Frasier syndrome.
In this study we investigated the regulation of the sex determination
gene SRY by WT1. Our results showed that WT1 up-regulates
the SRY gene through the proximal early growth response
gene-1-like DNA-binding sequences in the core promoter. Mutant WT1
proteins in Denys-Drash syndrome patients were unable to activate this
promoter. These mutants did not act in a dominant negative manner, as
expected over the wild-type WT1 in this promoter. We also found that
WT1 could transactivate the endogenous SRY gene. These
observations, together with the overlapping expression patterns of WT1
and SRY in human gonads, led us to propose that WT1 regulates SRY in
the initial sex determination process in humans and activates a cascade
of genes ultimately leading to the complete organogenesis of the testis.
To whom correspondence should be addressed: Dept. of
Biochemistry and Molecular Biology, Box 117, the University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Tel.: 713-792-2690; Fax: 713-791-9478; E-mail:
gsaunders@odin.mdacc.tmc.edu.
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