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• W2091364992 abstract "Raccoon polyomavirus (RacPyV) is associated with 100% of neuroglial tumors in free-ranging raccoons. Other tumor-associated polyomaviruses (PyVs), including simian virus 40 (SV40), murine PyV, and Merkel cell PyV, are found integrated in the host genome in neoplastic cells, where they constitutively express splice variants of the tumor antigen (TAg) gene. We have previously reported that RacPyV exists only as an episome (nonintegrated) in neuroglial tumors. Here, we have investigated TAg transcription in primary tumor tissue by transcriptome analysis, and we identified the alternatively spliced TAg transcripts for RacPyV. We also determined that TAg was highly transcribed relative to host cellular genes. We further colocalized TAg DNA and mRNA by in situ hybridization and found that the majority of tumor cells showed positive staining. Lastly, we examined the stability of the viral genome and TAg transcription by quantitative reverse transcriptase PCR in cultured tumor cells in vitro and in a mouse xenograft model. When tumor cells were cultured in vitro, TAg transcription increased nearly 2 log-fold over that of parental tumor tissue by passage 17. Both episomal viral genome and TAg transcription were faithfully maintained in culture and in tumors arising from xenotransplantation of cultured cells in mice. This study represents a minimal criterion for RacPyV's association with neuroglial tumors and a novel mechanism of stability for a polyomavirus in cancer.The natural cycle of polyomaviruses in mammals is to persist in the host without causing disease, but they can cause cancer in humans or in other animals. Because this is an unpredictable and rare event, the oncogenic potential of polyomavirus is primarily evaluated in laboratory animal models. Recently, raccoon polyomavirus (RacPyV) was identified in neuroglial tumors of free-ranging raccoons. Viral copy number was consistently high in these tumors but was low or undetectable in nontumor tissue or in unaffected raccoons. Unlike other oncogenic polyomaviruses, RacPyV was episomal, not integrated, in these tumors. To determine the stability of the viral genome and sustained transcription of the oncogenic tumor antigen genes, we cultured primary raccoon tumor cells and passaged them in mice, confirming the nonintegrated state of the virus and the maintenance of viral gene transcription throughout. RacPyV provides a naturally occurring and tractable model for a novel mechanism of polyomavirus-mediated oncogenesis." @default.
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• W2091364992 date "2014-11-01" @default.
• W2091364992 modified "2023-10-01" @default.
• W2091364992 title "The Raccoon Polyomavirus Genome and Tumor Antigen Transcription Are Stable and Abundant in Neuroglial Tumors" @default.
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• W2091364992 doi "https://doi.org/10.1128/jvi.01912-14" @default.
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