Systematic name M9444
Brief description Genes up-regulated in splenocytes with viral infection: Baki-1 MuLV versus Sendai.
Full description or abstract The genome of vertebrates contains endogenous retroviruses (ERVs) that have resulted from ancestral infections by exogenous retroviruses. ERVs are germline encoded, transmitted in a Mendelian fashion and account for about 8% of the human and 9.9% of the murine genome, respectively1, 2. By spontaneous activation and reintegration ERVs may cause insertional mutagenesis and thus participate in the process of malignant transformation or progression of tumor growth3, 4. However, if the innate immune system is able to recognize and control ERVs has not yet been elucidated. Here we report that, in vitro, nucleic-acid sensing TLRs on dendritic cells are activated by retroviral RNA and DNA from infected cells in vitro. Infection of TLR competent wild type mice with murine leukemia virus (MuLV)-like ERV isolates results in non-canonical gene upregulation, independent of type I IFN. In vivo, TLR3, -7 and -9 triple deficient mice (TLR379-/-) and mice with non functional TLR3, 7 and 9 signaling due to a mutation in UNC93B develop spontaneous ERV-induced viremia. More importantly, in TLR379-/- mice ERV-induced viremia correlates with acute T cell lymphoblastic leukemia (T-ALL). Multiple independent TLR379-/- T cell leukemia lines produce infectious MuLV of endogenous origin. These cell lines display de novo retroviral integration into the Nup214 or Notch1 gene locus leading to gene dysregulation that is reminiscent of aberrant Nup214 and Notch1 expression in human T-ALLs5. Overall, our results demonstrate that in addition to their role in innate immune defense against exogenous pathogens, TLR3,-7, and -9 may be essential for the control of endogenous retroviral mediated T-cell lymphomagenesis.
Collection C7: immunologic signature gene sets
      IMMUNESIGDB: ImmuneSigDB gene sets
Source publication Pubmed 23142781   Authors: Yu P,Lübben W,Slomka H,Gebler J,Konert M,Cai C,Neubrandt L,Costa da Prazeres O,Paul S,Dehnert S,Döhne K,Thanisch M,Storsberg S,Wiegand L,Kaufmann A,Nain M,Quintanilla-Martinez L,Bettio S,Schnierle B,Kolesnikova L,Becker S,Schnare M,Bauer S
Exact source GSE24671_2561_200_UP
Related gene sets (show 5 additional gene sets from the source publication)

(show 15 gene sets from the same authors)
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Organism Mus musculus
Contributed by Jernej Godec (Dana-Farber Cancer Institute)
Source platform HUMAN_GENE_SYMBOL
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Version history 7.3: Moved to ImmuneSigDB sub-collection.

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