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  • Although susceptibility of neurons in the brain to microbial infection is a major determinant of clinical outcome, little is known about the molecular factors governing this. Here, we show that two types of neurons from distinct brain regions exhibited differential permissivity to replication of several positive-stranded RNA viruses. Granule cell neurons (GCN) of the cerebellum and cortical neurons (CN) from the cerebral cortex have unique innate immune programs that confer differential susceptibility to viral infection ex vivo and in vivo. By transducing CN with genes that were expressed more highly in GCN, we identified three interferon-stimulated genes (ISGs; Ifi27, Irg1, and Rsad2/Viperin) that mediated antiviral effects against different neurotropic viruses. Moreover, we found that the epigenetic state and microRNA-mediated regulation of ISGs correlates with enhanced antiviral response in GCN. Thus, neurons from evolutionarily distinct brain regions have unique innate immune signatures, which likely contribute to their relative permissiveness to infection.
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