Novel WT1 mutation, 11p LOH, and t(7;12) (p22;q22) chromosomal translocation identified in a Wilms' tumor case.
About 5-10% of sporadic Wilms' tumors (WT) are associated with mutations in the Wilms' tumor 1 gene (WT1). More than 90% of patients with Denys-Drash syndrome (DDS; characterized by renal nephropathy, gonadal anomaly, and predisposition to WT) show constitutional intragenic WT1 mutations. We describe a novel WT1 stop-mutation in exon 2. This heterozygous germline mutation was detected in a one-year-old girl who was bilaterally affected with Wilms' tumor but without any other clinical manifestations of DDS. The C-to-A transversion is predicted to result in a polypeptide comprising only the first 165 amino acids of the WT1 protein. Loss of heterozygosity (LOH) studies comparing tumor DNA with lymphocyte DNA revealed LOH for the entire short arm of chromosome 11 in tumor tissue. In addition to the chromosome 11 lesions, the tumor showed a seemingly balanced chromosomal translocation t(7;12) (p22;q22) as the only visible cytogenetic aberration.
Löbbert
R W
RW
Children's Hospital, University of Mainz, Germany. loebbert@wserv.kinder.klinik.uni-mainz.de
Klemm
G
G
Grüttner
H P
HP
Harms
D
D
Winterpacht
A
A
Zabel
B U
BU
D002880:Chromosomes, Human, Pair 11 / Q000235:genetics*; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics*; D002897:Chromosomes, Human, Pair 7 / Q000235:genetics*; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D018095:Germ-Line Mutation / Q000235:genetics*; D006801:Humans; D007223:Infant; D019656:Loss of Heterozygosity / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*; D014178:Translocation, Genetic / Q000235:genetics*; D025721:WT1 Proteins; D009396:Wilms Tumor / Q000235:genetics*
D004268:DNA-Binding Proteins; D014157:Transcription Factors; D025721:WT1 Proteins