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The complex life of WT1.

Kay-Dietrich Wagner1, Nicole Wagner, Andreas Schedl

  • 1Johannes-Müller-Institut für Physiologie, Medizinische Fakultät (Charité), Humboldt-Universität Berlin, Germany.

Journal of Cell Science
|April 1, 2003
PubMed
Summary

The Wilms' tumour gene (WT1) has diverse roles beyond cancer suppression, influencing embryonic development and organ function through various isoforms. Genetic studies in mice reveal specific WT1 splice variants are crucial for kidney, gonad, and podocyte development.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The Wilms' tumour gene (WT1) encodes a transcription factor critical for development.
  • WT1 plays roles beyond tumour suppression, with multiple isoforms generated through alternative splicing and other mechanisms.
  • Understanding WT1 isoform function is essential for comprehending embryonic development and organ homeostasis.

Purpose of the Study:

  • To investigate the distinct roles of WT1 splice variants, specifically WT1(-KTS) and WT1(+KTS), in mouse development.
  • To elucidate the functional consequences of altering WT1 expression levels in kidney and heart tissues.

Main Methods:

  • Analysis of mouse strains with targeted deletions of WT1 exon 9 splice variants (WT1(-KTS) and WT1(+KTS)).
  • Phenotypic characterization of mutant mice focusing on kidney, gonad, and podocyte development.
  • Examination of WT1 function in response to reduced kidney expression and cardiac upregulation.

Main Results:

  • Mice lacking WT1(-KTS) exhibited severe kidney and gonad defects.
  • Mice lacking WT1(+KTS) displayed impaired podocyte function and male-to-female sex reversal.
  • Reduced WT1 in kidneys led to glomerulosclerosis, while cardiac WT1 upregulation potentially aids neovascularization.

Conclusions:

  • WT1 splice variants have distinct and critical functions in organ development and maintenance.
  • Specific WT1 isoforms are essential for normal kidney, gonad, and podocyte development.
  • WT1 dysregulation contributes to kidney disease and may play a role in cardiac repair mechanisms.

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