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Mutation of the MXI1 gene in prostate cancer
L R Eagle1, X Yin, A R Brothman
1Department of Pediatrics, Children's Hospital of Pittsburgh, Pennsylvania 15213, USA.
Abstract:
The Mxi1 protein negatively regulates Myc oncoprotein activity and thus potentially serves a tumour suppressor function. MXI1 maps to chromosome 10q24-q25, a region that is deleted in some cases of prostate cancer. We have detected mutations in the retained MXI1 alleles in four primary prostate tumours with 10q24-q25 deletions. Two tumours contained inactivating mutations, whereas two others contained the identical missense mutation. Fluorescence in situ hybridization also demonstrated loss of one MXI1 allele in an additional tumour lacking chromosome 10 abnormalities. MXI1 thus displays allelic loss and mutation in some cases of prostate cancer that may contribute to the pathogenesis or neoplastic evolution of this common malignancy.
Insights
The MXI1 gene, a potential tumor suppressor, shows mutations and deletions in prostate cancer cases. These genetic alterations in MXI1 may play a role in prostate cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The MXI1 protein regulates Myc oncoprotein activity, suggesting a tumor suppressor role.
- The MXI1 gene is located on chromosome 10q24-q25, a region frequently deleted in prostate cancer.
Purpose of the Study:
- To investigate mutations and allelic loss of the MXI1 gene in prostate cancer.
- To determine the potential contribution of MXI1 alterations to prostate cancer pathogenesis.
Main Methods:
- Mutation analysis of retained MXI1 alleles in primary prostate tumors.
- Fluorescence in situ hybridization (FISH) to assess allele loss.
Main Results:
- Inactivating and missense mutations were found in MXI1 alleles from tumors with 10q24-q25 deletions.
- Allelic loss of MXI1 was observed in a tumor without apparent chromosomal abnormalities.
- Identical missense mutations were detected in two separate tumors.
Conclusions:
- MXI1 exhibits allelic loss and mutation in a subset of prostate cancers.
- These genetic alterations in MXI1 may contribute to prostate cancer development and progression.