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Novel cancer gene discovery using a forward genetic screen in RCAS-PDGFB-driven gliomas
Holger Weishaupt1, Matko Čančer1, Gabriela Rosén1
1Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
Background:
Malignant gliomas, the most common malignant brain tumors in adults, represent a heterogeneous group of diseases with poor prognosis. Retroviruses can cause permanent genetic alterations that modify genes close to the viral integration site.
Methods:
Here we describe the use of a high-throughput pipeline coupled to the commonly used tissue-specific retroviral RCAS-TVA mouse tumor model system. Utilizing next-generation sequencing, we show that retroviral integration sites can be reproducibly detected in malignant stem cell lines generated from RCAS-PDGFB-driven glioma biopsies.
Results:
A large fraction of common integration sites contained genes that have been dysregulated or misexpressed in glioma. Others overlapped with loci identified in previous glioma-related forward genetic screens, but several novel putative cancer-causing genes were also found. Integrating retroviral tagging and clinical data, Ppfibp1 was highlighted as a frequently tagged novel glioma-causing gene. Retroviral integrations into the locus resulted in Ppfibp1 upregulation, and Ppfibp1-tagged cells generated tumors with shorter latency on orthotopic transplantation. In human gliomas, increased PPFIBP1 expression was significantly linked to poor prognosis and PDGF treatment resistance.
Conclusions:
Altogether, the current study has demonstrated a novel approach to tagging glioma genes via forward genetics, validating previous results, and identifying PPFIBP1 as a putative oncogene in gliomagenesis.
Insights
Researchers identified a novel oncogene, PPFIBP1, in malignant gliomas using a retroviral tagging method. This discovery offers new insights into brain tumor development and potential therapeutic targets.
Area of Science:
- Neuro-oncology
- Genetics
- Cancer Biology
Background:
- Malignant gliomas are aggressive brain tumors with poor outcomes.
- Retroviruses can induce genetic changes near their integration sites, potentially driving cancer.
Purpose of the Study:
- To develop and utilize a high-throughput retroviral tagging system for identifying genes involved in glioma development.
- To discover novel oncogenes and validate known cancer-related genes in malignant gliomas.
Main Methods:
- Employed a RCAS-TVA mouse model and next-generation sequencing for retroviral integration site analysis.
- Generated malignant stem cell lines from RCAS-PDGFB-driven glioma biopsies.
- Integrated retroviral tagging data with clinical information.
Main Results:
- Identified numerous common retroviral integration sites, many overlapping with known dysregulated or previously screened glioma genes.
- Discovered novel putative cancer-causing genes, notably highlighting Ppfibp1.
- Demonstrated that retroviral integration into the Ppfibp1 locus increases its expression, leading to shorter tumor latency.
- Found that elevated PPFIBP1 expression in human gliomas correlates with poor prognosis and resistance to PDGF treatment.
Conclusions:
- Established a novel forward genetics approach for identifying glioma-associated genes.
- Validated previous findings in glioma genetics.
- Identified PPFIBP1 as a putative oncogene in gliomagenesis with clinical relevance.
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