BRCA1 Regulates IFI16 Mediated Nuclear Innate Sensing of Herpes Viral DNA and Subsequent Induction of the Innate Inflammasome and Interferon-β Responses

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Invasion of a host cell by pathogens, including viruses, is sensed by pattern-recognition receptors resulting in the elicitation of the host innate defenses such as the formation of multi-protein inflammasome complexes, inflammatory IL-1β and IL-18 cytokine production and interferon-β production via the cytoplasmic STING molecule. We have shown that nuclear episomal viral DNA genomes of herpes viruses (KSHV, EBV and HSV-1) are sensed by the nuclear resident IFI16 protein, resulting in the formation of the IFI16-ASC-procaspase-1 inflammasome complex. Here, we show that BRCA1 promotes viral DNA sensing by IFI16 in the nucleus and is a constituent of the triggered IFI16-ASC-procaspase-1 inflammasome. IFI16 and BRCA1 are in complex in the nucleus and their association increases in the presence of KSHV, EBV or HSV-1 genomes, but not by the DNA damage response or vaccinia virus cytoplasmic dsDNA. The absence of BRCA1 results in abrogated IFI16-genome association, IFI16 cytoplasmic translocation, IL-1β production, IFI16 interaction with STING, IRF3 phosphorylation, pIRF3 nuclear translocation, and IFN-β induction. Taken together, these results demonstrate a crucial and novel role of BRCA1 in the innate sensing of viral DNA and subsequent induction of the inflammasome and interferon-β responses.

Vyšlo v časopise: BRCA1 Regulates IFI16 Mediated Nuclear Innate Sensing of Herpes Viral DNA and Subsequent Induction of the Innate Inflammasome and Interferon-β Responses. PLoS Pathog 11(6): e32767. doi:10.1371/journal.ppat.1005030
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1005030

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