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Molecular mechanisms possibly affecting WT1 function in human ovarian tumors
A Viel1, F Giannini, E Capozzi
1Division of Experimental Oncology 1, Centro di Riferimento Oncologico, Aviano (PN), Italy.
International Journal of Cancer
|May 15, 1994
Summary
The Wilms tumor 1 (WT1) gene is not a classical tumor suppressor in ovarian cancer, as no mutations were found. Allelic deletions may expose other oncogenes, with WT1 mRNA levels varying in tumors.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Frequent allelic deletions on chromosome 11p in ovarian tumors suggest a role for the WT1 gene.
- WT1 is a proposed tumor-suppressor gene located at 11p13, expressed in the fetal genitourinary system.
Purpose of the Study:
- To investigate the role of the WT1 gene in ovarian tumorigenesis.
- To determine if WT1 mutations or alterations contribute to ovarian cancer development.
Main Methods:
- Structural and sequence analysis of the WT1 gene's coding regions in ovarian tumor specimens and cell lines.
- Analysis of WT1 gene expression (mRNA levels) in ovarian tumors.
- Evaluation of WT1 expression data alongside p53 immunohistochemical data.
Main Results:
- No structural or sequence abnormalities in the WT1 gene were found in 20 ovarian tumors and 5 cell lines.
- WT1 was transcriptionally active in all tumors, but with significant variations in mRNA levels.
- WT1 allelic deletions did not correlate with WT1 gene mutations, suggesting other mechanisms in ovarian tumorigenesis.
Conclusions:
- The WT1 gene does not function as a classical tumor-suppressor gene in ovarian cancer.
- 11p13 allelic deletions may unmask other recessive oncogenes.
- Altered WT1 mRNA expression warrants further investigation for its functional effects in ovarian tumors, possibly involving p53 interactions.