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• W2023778304 abstract "ABSTRACT Like other DNA viruses that replicate in the nucleus, herpes simplex virus 1 (HSV-1) regulates the association of histones with its genome to promote viral replication and gene expression. We previously demonstrated that SNF2H, a member of the ISWI family of chromatin-remodeling factors, is concentrated in HSV-1 replication compartments in the nuclei of infected cells, suggesting that this cellular enzyme plays a role in viral replication. We show here that small interfering RNA (siRNA)-mediated knockdown of SNF2H in HEp-2 cells resulted in an approximately 20-fold decrease in HSV-1 replication, arguing that SNF2H promotes efficient HSV-1 replication. Decreases in HSV-1 replication were observed with multiple SNF2H-specific siRNAs, and the extent of the replication decrease correlated with the amount of SNF2H knockdown, indicating that the phenotype resulted from decreased SNF2H levels rather than off-target effects of the siRNAs. We also observed a decrease in the accumulation of immediate-early (IE) gene products in HSV-1-infected cells in which SNF2H was knocked down. Histone H3 occupancy on viral promoters was increased in HSV-1-infected cells that were transfected with SNF2H-specific siRNAs, suggesting that SNF2H promotes removal of histones from viral promoters during infection. Furthermore, chromatin immunoprecipitation (ChIP) studies showed that SNF2H associated with the HSV-1 genome during infection, which suggests that SNF2H may directly remodel viral chromatin. We hypothesize that SNF2H is recruited to viral promoters during HSV-1 infection, where it can remodel the chromatin state of the viral genome, facilitate the transcription of immediate-early genes, and enhance viral replication. IMPORTANCE It is becoming increasingly appreciated that regulation of the state of chromatin is a major determinant in control of gene expression. It has also become clear that the state of chromatin of the herpes simplex virus 1 (HSV-1) genome is dynamically regulated during both productive and latent stages of infection. In addition, multiple viral gene products have been reported to play roles in regulating the viral chromatin state. However, the cellular chromatin-remodeling factors involved in altering nucleosome occupancy at viral genes remain largely unknown. The results in this report represent the first evidence that cellular chromatin-remodeling proteins, and SNF2H in particular, can play important roles in regulating the chromatin state of the HSV-1 genome during infection. This work also further establishes HSV-1 infection as a useful model to study chromatin control of gene expression and suggests that disrupting the regulation of viral chromatin states can possibly be exploited as a novel antiviral therapeutic target." @default.
• W2023778304 created "2016-06-24" @default.
• W2023778304 creator A5039611599 @default.
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• W2023778304 date "2011-03-01" @default.
• W2023778304 modified "2023-10-01" @default.
• W2023778304 title "Cellular SNF2H Chromatin-Remodeling Factor Promotes Herpes Simplex Virus 1 Immediate-Early Gene Expression and Replication" @default.
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• W2023778304 doi "https://doi.org/10.1128/mbio.00330-10" @default.
• W2023778304 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3023163" @default.
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