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ICP27 is an essential herpes simplex virus 1 (HSV-1) regulatory protein that enhances viral gene expression. Although it is predominantly nuclear, it shuttles to the cytoplasm during infection using an N-terminal nuclear export signal (NES). We previously engineered an NES-negative ICP27 mutant, dLeu, that replicates poorly in cultured cells. In this study, we isolated dLeuR, a growth-competent revertant of dLeu. We show that dLeuR possesses one or more extragenic mutations that enhance ICP27 transcription, leading to overexpression of the mutant protein and restoration of viral growth. This work provides evidence of a novel pathway regulating transcription of the ICP27 gene.

Phenotypic Suppression of a Herpes Simplex Virus 1 ICP27 Mutation by Enhanced Transcription of the Mutant Gene