TY - JOUR
T1 - Genotype/phenotype correlations in Wilms' tumor
AU - Huff, Vicki
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1996/11
Y1 - 1996/11
N2 - Study of genotype/phenotype relationships involving the Wilms' tumor (WT) gene, WT1, in WT patients has provided insights into the function of the WT1 protein, a transcriptional regulator, and has suggested possible mutational mechanisms important in the etiology of WT. For example, the identification of deletion/insertion mutations in the first exon implicates a deletion hotspot consensus sequence in the etiology of these mutations. The disproportionate number of WT/aniridia patients with such mutations further suggest that this genetic mechanism may be enhanced by the hemizygous state. WT1 mutations are observed throughout the gene and, as predicted by the two- hit mutational model, germline mutations predominantly occur in patients with congenital genitourinary (GU) anomalies and/or bilateral disease. The presence of hemizygous mutations in tumors from individuals with germline 11 p13 deletions encompassing WTI supports the hypothesis that inactivation of both WT1 alleles is important in tumorigenesis. Analyses of WTI mutations in individuals with WT-associated Drash syndrome and WT patients with GU anomalies in the absence of Drash syndrome indicate that Drash patients almost invariably carry germline missense mutations in the zinc finger domains whereas WT1 GU patients carry germline mutations that delete the WT1 gene or encode truncated proteins. These data suggest a functional difference between mutant WT1 protein carrying a single amino acid substitution versus mutant WT1 protein that is grossly truncated or WT1 haploinsufficiency. These and other genotype/phenotype correlations in WT patients will be discussed in more detail.
AB - Study of genotype/phenotype relationships involving the Wilms' tumor (WT) gene, WT1, in WT patients has provided insights into the function of the WT1 protein, a transcriptional regulator, and has suggested possible mutational mechanisms important in the etiology of WT. For example, the identification of deletion/insertion mutations in the first exon implicates a deletion hotspot consensus sequence in the etiology of these mutations. The disproportionate number of WT/aniridia patients with such mutations further suggest that this genetic mechanism may be enhanced by the hemizygous state. WT1 mutations are observed throughout the gene and, as predicted by the two- hit mutational model, germline mutations predominantly occur in patients with congenital genitourinary (GU) anomalies and/or bilateral disease. The presence of hemizygous mutations in tumors from individuals with germline 11 p13 deletions encompassing WTI supports the hypothesis that inactivation of both WT1 alleles is important in tumorigenesis. Analyses of WTI mutations in individuals with WT-associated Drash syndrome and WT patients with GU anomalies in the absence of Drash syndrome indicate that Drash patients almost invariably carry germline missense mutations in the zinc finger domains whereas WT1 GU patients carry germline mutations that delete the WT1 gene or encode truncated proteins. These data suggest a functional difference between mutant WT1 protein carrying a single amino acid substitution versus mutant WT1 protein that is grossly truncated or WT1 haploinsufficiency. These and other genotype/phenotype correlations in WT patients will be discussed in more detail.
KW - WAGR syndrome
KW - Wilms' tumor
KW - genetic variants
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U2 - 10.1002/(SICI)1096-911X(199611)27:5<408::AID-MPO4>3.0.CO;2-Q
DO - 10.1002/(SICI)1096-911X(199611)27:5<408::AID-MPO4>3.0.CO;2-Q
M3 - Article
C2 - 8827067
AN - SCOPUS:0029797218
SN - 0098-1532
VL - 27
SP - 408
EP - 414
JO - Medical and Pediatric Oncology
JF - Medical and Pediatric Oncology
IS - 5
ER -