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3' untranslated regions (UTRs) are known to play an important role in posttranscriptional regulation of gene expression. Here we map the 3' UTRs of Kaposi's sarcoma-associated herpesvirus (KSHV) using next-generation RNA sequencing, 3' rapid amplification of cDNA ends (RACE), and tiled microarray analyses. Chimeric reporters containing the KSHV 3' UTRs show a general trend toward reduced gene expression under conditions of latent infection. Those 3' UTRs with a higher GC content are more likely to be associated with reduced gene expression. KSHV transcripts display an extensive use of shared polyadenylation sites allowing for partially overlapping 3' UTRs and regulatory activities. In addition, a subset of KSHV 3' UTRs is sufficient to convey increased gene expression under conditions of lytic infection. These results suggest a role for viral 3' UTRs in contributing to differential gene expression during latent versus lytic infection.

journal of virology

Comprehensive Mapping and Analysis of Kaposi's Sarcoma-Associated Herpesvirus 3′ UTRs Identify Differential Posttranscriptional Control of Gene Expression in Lytic versus Latent Infection