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Mutations in transcript isoforms of the neurofibromatosis 2 gene in multiple human tumour types
A B Bianchi1, T Hara, V Ramesh
1Department of Molecular Genetics and Cell Biology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey 08543-4000.
Abstract:
The neurofibromatosis 2 gene (NF2) has recently been isolated and predicted to encode a novel protein related to the moesin-ezrin-radixin family of cytoskeleton-associated proteins. Here we describe a novel isoform of the NF2 transcript that shows differential tissue expression and encodes a modified C terminus of the predicted protein. Mutations affecting both isoforms of the NF2 transcript were detected in multiple tumour types including melanoma and breast carcinoma. These findings provide evidence that alterations in the NF2 transcript occur not only in the hereditary brain neoplasms typically associated with NF2, but also as somatic mutations in their sporadic counterparts and in seemingly unrelated tumour types. The NF2 gene may thus constitute a tumour suppressor gene of more general importance in tumorigenesis.
Insights
The neurofibromatosis 2 (NF2) gene, linked to hereditary brain tumors, has a newly found isoform. This NF2 isoform and its mutations are implicated in various cancers, including melanoma and breast cancer.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- The neurofibromatosis 2 gene (NF2) encodes a protein related to cytoskeleton-associated proteins.
- NF2 is primarily associated with hereditary brain neoplasms.
Purpose of the Study:
- To identify and characterize novel isoforms of the NF2 transcript.
- To investigate the role of NF2 mutations in various tumor types beyond hereditary brain neoplasms.
Main Methods:
- Transcript analysis to identify novel isoforms.
- Mutation analysis in tumor samples.
Main Results:
- A novel isoform of the NF2 transcript with differential tissue expression and a modified C terminus was identified.
- Mutations affecting both NF2 isoforms were found in melanoma and breast carcinoma, in addition to hereditary brain neoplasms.
- Somatic mutations in NF2 were observed in sporadic tumors.
Conclusions:
- The NF2 gene, through its different isoforms, plays a broader role in tumorigenesis than previously recognized.
- NF2 acts as a tumor suppressor gene with implications for a wider range of cancers, including sporadic forms.