Herpes simplex virus 1 (HSV-1) and Influenza A viruses (IAV) induce Z-form nucleic acid Binding Protein 1 (ZBP1)-initiated cell death1-8. ZBP1 is activated by Z-RNA1,7,9, and the Z-RNAs which trigger ZBP1 during HSV-1 and IAV infections were assumed to be of viral origin1. However, we show here that host cell-encoded Z-RNAs are major and sufficient ZBP1 activating ligands following infection by these two human pathogens. The majority of cellular Z-RNAs mapped to intergenic endogenous retroelements (EREs) embedded within abnormally long 3' extensions of host cell mRNAs. These aberrant host cell transcripts arose as a consequence of Disruption of Transcription Termination (DoTT), a virus-driven phenomenon which disables Cleavage and Polyadenylation Specificity Factor (CPSF)-mediated 3' processing of nascent pre-mRNAs10-15. Mutant viruses lacking ICP27 or NS1, the virus-encoded proteins responsible for inhibiting CPSF and triggering DoTT13,15, failed to induce host cell Z-RNA accrual and were attenuated in their ability to stimulate ZBP1. Ectopic expression of HSV-1 ICP27 or IAV NS1, or pharmacological blockade of CPSF activity, induced accumulation of host cell Z-RNAs and activated ZBP1. These results demonstrate that DoTT-generated cellular Z-RNAs are bona fide ZBP1 ligands, and position ZBP1-activated cell death as a host response to counter viral disruption of the cellular transcriptional machinery.
FörderungenNIH Cancer Center Support Grant UKRI Medical Research Council The 1.3.5 project for disciplines of excellence from West China Hospital of Sichuan University National Science and Technology Major Project of China National Natural Science Foundation of China Association of Lebanese and Syrian American Charities at St Jude Children's Hospital St Jude Center of Excellence for Influenza Research and Surveillance (SJCEIRS) NIAID Slovenian Research and Innovation Agency European Research Council Bohringer Ingelheim Funds Radcliffe Department of Medicine and Keble and St Cross Oxford Colleges Clarendon Fund Basic Research Program of the National Research University Higher School of Economics Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) German Research Foundation (DFG) Danish National Research Foundation (DNRF) State of Bavaria German Research Foundation NIH grants