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Synovial sarcoma: from genetics to genetic-based animal modeling
Malay Haldar1, R Lor Randall, Mario R Capecchi
1Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112-5331, USA.
Abstract:
Synovial sarcomas are highly aggressive mesenchymal cancers that show modest response to conventional cytotoxic chemotherapy, suggesting a definite need for improved biotargeted agents. Progress has been hampered by the lack of insight into pathogenesis of this deadly disease. The presence of a specific diagnostic t(X;18) translocation leading to expression of the unique SYT-SSX fusion protein in effectively all cases of synovial sarcoma suggests a role in the etiology. Other nonspecific anomalies such as overexpression of Bcl-2, HER-2/neu, and EGFR have been reported, but their role in the pathogenesis remains unclear. Using gene targeting, we recently generated mice conditionally expressing the human SYT-SSX2 fusion gene from mouse endogenous ROSA26 promoter in chosen tissue types in the presence of Cre recombinase. These mice develop synovial sarcoma when SYT-SSX2 is expressed within myoblasts, thereby identifying a source of this enigmatic tumor and establishing a mouse model of this disease that recapitulates the clinical, histologic, immunohistochemical, and transcriptional profile of human synovial sarcomas. We review the genetics of synovial sarcoma and discuss the usefulness of genetics-based mouse models as a valuable research tool in the hunt for key molecular determinants of this lethal disease as well as a preclinical platform for designing and evaluating novel treatment strategies.
Insights
Researchers created a new mouse model for synovial sarcoma by targeting the SYT-SSX2 gene. This model accurately mimics human disease, aiding research into targeted therapies for this aggressive cancer.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Synovial sarcoma is an aggressive cancer with limited treatment options.
- The SYT-SSX fusion protein, resulting from a specific translocation, is implicated in synovial sarcoma development.
- Understanding the tumor's pathogenesis is crucial for developing effective therapies.
Purpose of the Study:
- To establish a genetically engineered mouse model for synovial sarcoma.
- To investigate the role of the SYT-SSX2 fusion gene in tumor development.
- To provide a preclinical platform for evaluating novel treatment strategies.
Main Methods:
- Conditional gene targeting in mice using Cre-lox system.
- Expression of human SYT-SSX2 fusion gene in mouse myoblasts.
- Characterization of the resulting tumors for clinical, histologic, and molecular profiles.
Main Results:
- Conditional expression of SYT-SSX2 in myoblasts induced synovial sarcoma in mice.
- The generated mouse model recapitulated key features of human synovial sarcoma.
- The model demonstrated high fidelity in clinical, histologic, immunohistochemical, and transcriptional profiles.
Conclusions:
- The SYT-SSX2 fusion gene is sufficient to induce synovial sarcoma in vivo.
- Genetics-based mouse models are valuable tools for studying synovial sarcoma pathogenesis.
- This novel mouse model serves as a preclinical platform for developing targeted therapies.
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