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Herpesvirus late genes require viral DNA replication for maximal expression. Although late gene expression appears to require DNA replication in cis in alphaherpesviruses, studies in Epstein-Barr virus (EBV) suggest that this cis-requirement might not pertain to the gammaherpesviruses. Based on these findings, a system was created to investigate the elements required for the regulation of Kaposi's sarcoma-associated herpesvirus (KSHV; human herpesvirus-8) late gene expression. The transcript of a classic late gene encoding the viral assembly protein was characterized and reporter genes driven by the assembly protein promoter region were constructed. Unlike the EBV case, expression of a reporter gene under the control of the assembly protein promoter did not display authentic regulation when removed from the context of the viral genome. Although reporter expression rose in cells displaying lytic replication, this expression was not diminished by specific inhibitors of viral DNA synthesis. Minimal core promoters were similarly unable to reproduce late gene regulation. These results suggest that proper KSHV late gene expression is likely to be dependent upon virus lytic replication in cis and indicate that the regulation of KSHV late genes more closely resembles that observed in herpes simplex virus than that described for EBV.

On the control of late gene expression in Kaposi’s sarcoma-associated herpesvirus (human herpesvirus-8)