Key Points
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WT1 and WTX seem to function as tumour suppressor genes (TSGs) in Wilms' tumours, but questions have arisen about these labels.
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The lack of an increased frequency of Wilms' tumours or other malignancies in patients with osteopathia striata congenita with cranial sclerosis (OSCS) with WTX germline mutations initially challenged its designation as a TSG, but a recent observation of Wilms' tumour precursor lesions in a patient with OSCS supports this label.
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In Wilms' tumours, WT1 conforms to a TSG label: patients heterozygous for WT1 germline mutations are predisposed to Wilms' tumour and WT1 is inactivated in tumours. These data link loss of WT1 function with enhanced cell viability and/or proliferation.
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By contrast, ablation of WT1 at the initial stages of kidney development results in apoptosis and renal agenesis, indicating that it has a crucial role in maintaining cell viability.
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In some leukaemias, the increased expression of WT1 compared with normal bone marrow cells, along with some reports of WT1 expression being a marker of poor prognosis, suggest that WT1 functions as an oncogene. By contrast, observations of WT1 inactivating mutations in leukaemias suggest it functions as a TSG.
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WT1 has important roles in regulating normal differentiation in various organs and cell types. During both nephrogenesis and haematopoiesis, loss of WT1 or overexpression of WT1 is associated with differing phenotypic consequences, depending on the differentiation status of the cell.
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The oncogenic or tumour suppressive effect of WT1 alteration is likely to be a result of how a cell at a particular stage of development responds to perturbations in normal differentiation. In short, either label may be misleading and/or inadequate when used to describe the function of WT1.
Abstract
Genes identified as being mutated in Wilms' tumour include TP53, a classic tumour suppressor gene (TSG); CTNNB1 (encoding β-catenin), a classic oncogene; WTX, which accumulating data indicate is a TSG; and WT1, which is inactivated in some Wilms' tumours, similar to a TSG. However, WT1 does not always conform to the TSG label, and some data indicate that WT1 enhances cell survival and proliferation, like an oncogene. Is WT1 a chameleon, functioning as either a TSG or an oncogene, depending on cellular context? Are these labels even appropriate for describing and understanding the function of WT1?
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Acknowledgements
The author would like to thank C. Ruteshouser for her assistance. The author's work is supported by US NIH grants CA34936 and DK069599, NCI CCSG grant CA16672 and CPRIT grants RP100329 and RP110234.
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Glossary
- Autosomal dominant trait
-
A trait that is the result of being heterozygous for an allele for a gene that is present on any non-sex (not the X or Y) chromosome.
- Aniridia
-
Lack of development of the iris of the eye.
- Rhabdomyosarcoma
-
A tumour of skeletal muscle.
- Intermediate mesoderm
-
Region of the embryonic mesoderm from which the kidneys and gonads arise.
- Metanephric blastema
-
A subpopulation of the intermediate mesoderm that induces the outgrowth of the ureteric bud and from which the nephrons and stroma of the mature kidney arise.
- Renal agenesis
-
Lack of development of the kidney.
- Kidney rudiment explant culture
-
Embryonic kidneys as early as the stage at which the ureteric bud begins to invade the metanephric mesenchyme can be grown in culture chambers on filters. The reciprocal inductive interactions between the ureteric bud and the metanephric mesenchyme occur in culture, resulting in a three-dimensional structure of nephrons and collecting ducts like a normal kidney but without capillary invasion.
- Ureteric bud
-
A developmental structure that buds off the mesonephric (Wolffian) duct, invades the metanephric mesenchyme and develops into the collecting duct system of the kidney.
- Glomerulosclerosis
-
A general term to describe scarring of the glomerulus, the primary filtration structure in the kidney predominantly composed of capillaries and podocytes.
- Denys–Drash syndrome
-
A phenotypic triad of Wilms' tumour, congenital genitourinary anomalies and early-onset renal failure.
- Gonadoblastoma
-
A tumour arising in the developing ovary or testes.
- TEL–PDGFBR and AML1–ETO
-
Two different fusion proteins resulting from chromosomal translocations and observed in some myeloid leukaemias. In TEL–PDGFBR the N-terminal region of TEL is fused with the domain of transmembrane and cytoplasmic domains of the receptor kinase protein, PDGFBR. In AML1–ETO the DNA binding domain of AML1 is fused with the ETO co-repressor protein.
- Comma-shaped and S-shaped bodies
-
Two morphological stages observed as induced metanephric mesenchyme differentiates and epithelializes to form mature nephrons.
- Osteopathia striata congenita with cranial sclerosis
-
(OSCS). X-linked dominant condition in which increased bone density and aberrant development of the skull is commonly observed. Fetal or perinatal lethality is often observed in males.
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Huff, V. Wilms' tumours: about tumour suppressor genes, an oncogene and a chameleon gene. Nat Rev Cancer 11, 111–121 (2011). https://doi.org/10.1038/nrc3002
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DOI: https://doi.org/10.1038/nrc3002
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