Systematic name M18201
Brief description Genes down-regulated in BJAB cell line (B lymphocyte) after expression of the viral microRNA miR-K12-11 which functions as an ortholog of cellular MIR155 [GeneID=406947].
Full description or abstract All metazoan eukaryotes express microRNAs (miRNAs), roughly 22-nucleotide regulatory RNAs that can repress the expression of messenger RNAs bearing complementary sequences. Several DNA viruses also express miRNAs in infected cells, suggesting a role in viral replication and pathogenesis. Although specific viral miRNAs have been shown to autoregulate viral mRNAs or downregulate cellular mRNAs, the function of most viral miRNAs remains unknown. Here we report that the miR-K12-11 miRNA encoded by Kaposi's-sarcoma-associated herpes virus (KSHV) shows significant homology to cellular miR-155, including the entire miRNA 'seed' region. Using a range of assays, we show that expression of physiological levels of miR-K12-11 or miR-155 results in the downregulation of an extensive set of common mRNA targets, including genes with known roles in cell growth regulation. Our findings indicate that viral miR-K12-11 functions as an orthologue of cellular miR-155 and probably evolved to exploit a pre-existing gene regulatory pathway in B cells. Moreover, the known aetiological role of miR-155 in B-cell transformation suggests that miR-K12-11 may contribute to the induction of KSHV-positive B-cell tumours in infected patients.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 18075594   Authors: Gottwein E,Mukherjee N,Sachse C,Frenzel C,Majoros WH,Chi JT,Braich R,Manoharan M,Soutschek J,Ohler U,Cullen BR
Exact source Table 1S
Related gene sets (show 9 gene sets from the same authors)
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Organism Homo sapiens
Contributed by Jessica Robertson (Broad Institute)
Source platform EntrezGeneIds
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Compendia expression profiles Human tissue compendium (Novartis)
NCI-60 cell lines (National Cancer Institute)
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Version history 3.0: First introduced

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