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Macrophages (M phi) are activated by IFN gamma and are important cellular targets for infection by human and murine cytomegalovirus (MCMV), making it advantageous for CMVs to block IFN gamma-induced M phi differentiation. We found that MCMV infection inhibited IFN gamma regulation of many genes in M phi. MCMV infection blocked IFN gamma responses at the level of transcription without blocking Janus kinase/signal transducer and activator of transcription pathway activation and targeted IFN response factor 1- and class II transactivator-dependent and independent promoters. MCMV did not alter basal transcription from IFN gamma-responsive promoters and left the majority of cellular transcripts unchanged even after 48 h of infection. The effects of MCMV infection were specific to chromosomal rather than transiently transfected promoters. Characterization of the IFN gamma-responsive chromosomal class II transactivator promoter revealed that MCMV infection blocked IFN gamma-induced promoter assembly, allowing the virus to transcriptionally paralyze infected M phi responses while allowing basal transcription to proceed.

Murine cytomegalovirus paralyzes macrophages by blocking IFNγ-induced promoter assembly