Transcriptional origin of Kaposi's sarcoma-associated herpesvirus microRNAs.

Journal Article (Journal Article)

Kaposi's sarcoma-associated herpesvirus (KSHV) encodes 11 distinct microRNAs, all of which are found clustered within the major latency-associated region of the KSHV genome in the same transcriptional orientation. Because the KSHV microRNAs are all expressed in latently infected cells and are largely unaffected by induction of lytic replication, it appeared probable that they would be processed out of KSHV transcripts that are derived from a latent promoter(s) present in this region. Here, we define three latent transcripts, derived from two distinct KSHV latent promoters, that function as both KSHV primary microRNA precursors and as kaposin pre-mRNAs. These activities require the readthrough of a leaky viral polyadenylation signal located at nucleotide 122070 in the KSHV genome. In contrast, recognition of this polyadenylation signal gives rise to previously identified mRNAs that encode the KSHV open reading frames (ORFs) 71, 72 and 73 proteins as well as a novel unspliced KSHV mRNA that encodes only ORF72 and ORF71. Thus, transcripts initiating at the two latent promoters present in the KSHV latency-associated region can undergo two entirely distinct fates, i.e., processing to give a kaposin mRNA and viral microRNAs on the one hand or expression as KSHV ORF71, ORF72, or ORF73 mRNAs on the other, depending on whether the viral polyadenylation site located at position 122070 is ignored or recognized, respectively.

Full Text

Duke Authors

Cited Authors

  • Cai, X; Cullen, BR

Published Date

  • March 2006

Published In

Volume / Issue

  • 80 / 5

Start / End Page

  • 2234 - 2242

PubMed ID

  • 16474131

Pubmed Central ID

  • PMC1395403

International Standard Serial Number (ISSN)

  • 0022-538X

Digital Object Identifier (DOI)

  • 10.1128/JVI.80.5.2234-2242.2006


  • eng

Conference Location

  • United States