Many viruses that infect eukaryotic cells express genes that alterthe regulation of host gene expression to promote viral replication.For example, herpes simplex virus-1 (HSV-1) expresses aprotein called ICP0, which is necessary for successful viral infectionand replication within the host. Lutz et al. (2017. Viruses9: 210) showed that ICP0 can act as a ubiquitin ligase and targetthe redundant transcriptional repressors ZEB1 and ZEB2,which leads to upregulation of the miR-183 cluster (a set of threemiRNAs transcribed from the same locus). Speculate on how miR-183 cluster upregulation may benefitthe virus.

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.