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Exon skipping due to a mutation in a donor splice site in the WT-1 gene is associated with Wilms' tumor and severe genital malformations

Abstract

A germline WT-1 point mutation is described in a patient with unilateral Wilms' tumor, nephritis and ambiguous external genitalia. The patient was diagnosed as a possible case of Denys Drash syndrome (DDS). Analysis of the WT-1 exons and intron borders revealed a G to C transversion in the +1 position of the splice donor consensus sequence in intron 6. Two transcripts of abnormal size were identified in tumor RNA. Sequencing of the altered WT-1 mRNA revealed that this point mutation leads to exon-skipping, resulting in transcripts either missing exon 6 or exons 5 and 6. The normally occurring alternative splicing of exon 5 in the WT-1 gene is not affected by this mutation. The reading frame is changed when either both exons 5 and 6 or exon 6 alone are missing and a stop codon follows immediately downstream in exon 7. Most mutations identified in DDS are missense mutations located in the zinc finger (ZF) region (exons 7, 8 and 9) but recently a patient with a germline mutation in exon 6 leading to premature chain termination was described. Therefore the site of the mutation in the WT-1 gene in this patient cannot exclude the possibility that he has DDS.

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Schneider, S., Wildhardt, G., Ludwig, R. et al. Exon skipping due to a mutation in a donor splice site in the WT-1 gene is associated with Wilms' tumor and severe genital malformations. Hum Genet 91, 599–604 (1993). https://doi.org/10.1007/BF00205087

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Keywords

  • Nephritis
  • Germline Mutation
  • Chain Termination
  • Donor Splice
  • External Genitalia