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The human polyomavirus JC virus is the etiologic agent of progressive multifocal leukoencephalopathy (PML). The JC virus early promoter directs cell-specific expression of the viral replication factor large T antigen, thus transcriptional regulation constitutes a major mechanism of glial tropism in PML. Here we found that pentanucleotide sequence immediately upstream of the TATA sequence functions as a cell-specific silencer in the JC virus transcription. In vitro binding studies showed that synthetic oligonucleotides spanning a pentanucleotide sequence, designated "oligo 2", interacts with nuclear proteins from non-glial cells in a cell-specific manner. Furthermore, the sequence preferentially repressed the heterologous thymidine kinase promoter activity in non-glial cells. We also tested whether JC virus transcription is controlled by DNA methylation. Transient transfection of in vitro methylated JC virus promoter abolished transcription in both the glial and non-glial cells. The repression fold was much larger in glial cells than in non-glial cells. Taken together, this finding suggests that glial cell-specific expression of the JC virus is controlled by DNA methylation as well as cell-specific silencers.
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