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Recent advances in the molecular analysis of human malignant mesothelioma
1Human Genetics Program, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
Purpose:
To evaluate the role of asbestos, somatic genetic alterations, and simian virus 40 (SV40) in the formation of malignant mesothelioma (MM).
Design:
To review recent cytogenetic and molecular genetic advances in MM.
Results:
Exposure to asbestos is a major factor contributing to the development of most MMs. The accumulation of recurrent cytogenetic deletions in most MMs suggests a multistep process in this malignancy characterized by the loss and/or inactivation of multiple tumor suppressor genes (TSGs). Karyotypic, comparative genomic hybridization (CGH), and loss of heterozygosity (LOH) analyses of MMs have demonstrated frequent deletions of specific chromosomal regions within 1p, 3p, 6q, 9p, 13q, 15q, and 22q. Positional candidate gene approaches have identified TSGs within two of these regions, i.e., CDKN2A at 9p21 and NF2 at 22q12, which are frequently altered in MMs. In addition, recent studies have demonstrated the presence and expression of SV40 in many MMs. Proposed mechanisms by which asbestos and SV40 contribute to the development of MM are reviewed.
Conclusions:
The identification of new TSGs involved in MM and understanding the role of these genes and of SV40 in the pathogenesis of this malignancy may lead to design of more effective therapeutic strategies.
Insights
Asbestos exposure is a key cause of malignant mesothelioma (MM). Genetic alterations and simian virus 40 (SV40) also play roles in MM development, suggesting new therapeutic targets.
Area of Science:
- Oncology
- Genetics
- Environmental Health
Background:
- Malignant mesothelioma (MM) is a serious cancer with limited treatment options.
- The etiology of MM involves complex interactions between environmental factors and genetic changes.
Purpose of the Study:
- To investigate the roles of asbestos, somatic genetic alterations, and simian virus 40 (SV40) in the pathogenesis of malignant mesothelioma (MM).
- To review current understanding of genetic and molecular mechanisms underlying MM development.
Main Methods:
- Review of recent advances in cytogenetic and molecular genetics of MM.
- Analysis of karyotypic, comparative genomic hybridization (CGH), and loss of heterozygosity (LOH) data.
Main Results:
- Asbestos exposure is a primary risk factor for most MM cases.
- Frequent deletions and inactivation of tumor suppressor genes (TSGs) at chromosomal regions 1p, 3p, 6q, 9p, 13q, 15q, and 22q are observed in MM.
- The tumor suppressor genes CDKN2A (9p21) and NF2 (22q12) are frequently altered in MM.
- Simian virus 40 (SV40) presence and expression are detected in numerous MM cases.
Conclusions:
- Identifying novel TSGs and understanding the roles of these genes and SV40 in MM pathogenesis are crucial.
- This knowledge may facilitate the development of more effective therapeutic strategies for malignant mesothelioma.