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Molecular characterization of SV40 DNA in multiple samples from a human mesothelioma
A S Arrington1, J A Lednicky, J S Butel
1Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA.
Background:
Prolonged exposure to asbestos, a potent carcinogen, has been the generally accepted factor responsible for the development of human mesotheliomas. Recent reports documenting the detection of SV40 DNA in human mesotheliomas suggest the possibility that this known tumor virus may be an additional factor involved in the development of some tumors.
Methods:
A detailed analysis was performed by polymerase chain reaction and DNA sequencing of the genetic characteristics of SV40 viral DNA detected in samples taken from multiple sites of a human mesothelioma.
Results:
A single virus variant was detected within the tumor that encoded a novel variable region at the C-terminus of the large T-antigen oncoprotein. The viral regulatory region was predominantly archetypal in sequence (lacking duplications of the enhancer), typical of natural isolates.
Conclusions:
These data confirm previous reports from several laboratories showing an association of SV40 DNA with human mesotheliomas and provide the first evidence of a novel virus variant present in separated regions of a mesothelioma.
Insights
This study confirms Simian virus 40 (SV40) DNA in human mesotheliomas. A novel SV40 variant with a unique oncoprotein was identified, suggesting a potential role for this virus in mesothelioma development.
Area of Science:
- Oncology
- Virology
- Molecular Biology
Background:
- Asbestos exposure is a known cause of malignant mesothelioma.
- Recent findings suggest Simian virus 40 (SV40) may also contribute to mesothelioma development.
Observation:
- SV40 DNA was detected in human mesothelioma samples.
- A detailed genetic analysis of the viral DNA was performed using polymerase chain reaction and DNA sequencing.
Findings:
- A single, novel SV40 variant was identified within the tumor.
- This variant featured a unique variable region in its large T-antigen oncoprotein.
- The viral regulatory region was archetypal, lacking enhancer duplications.
Implications:
- These findings support the association between SV40 DNA and human mesotheliomas.
- This study provides the first evidence of a novel SV40 variant in mesothelioma.
- Further research is warranted to understand the role of this SV40 variant in oncogenesis.
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