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Although PIV5-infected cells are resistant to IFN due to the ability of the V protein to target STAT1 for degradation, PIV5 shows residual IFN sensitivity when infecting cells that have already been exposed to IFN. We have previously reported that the human IFN-stimulated gene with the greatest inhibitory effect on PIV5 is IFIT1. IFIT1 inhibits the translation of incompletely methylated mRNAs (Cap0) but not those 2\u2032-O-methylated at the first transcribed nucleotide (Cap1). All <jats:italic>Mononegavirales<\/jats:italic> are thought to generate Cap1 mRNA, so the sensitivity of PIV5 to IFIT1 is surprising. Here, we show that PIV5 generates Cap0 mRNA but not Cap1 mRNA, thus explaining its sensitivity to IFIT1. Furthermore, the sensitivity of different PIV5 genes to IFIT1-mediated translation inhibition varies. In the absence of complete Cap methylation, we show that the presence or absence of 5\u2032-terminal RNA hairpin structures in the 5\u2032UTRs of PIV5 genes determines the extent to which they are sensitive to IFIT1. Notably, the genes involved in RNA synthesis are relatively resistant to IFIT1 inhibition. This presents a potential mechanism by which IFIT1 can regulate the outcome of PIV5 infection in response to IFN and may be important in allowing the virus to establish prolonged\/persistent infections.<\/jats:p>","DOI":"10.1099\/jgv.0.002093","type":"journal-article","created":{"date-parts":[[2025,3,27]],"date-time":"2025-03-27T17:17:16Z","timestamp":1743095836000},"source":"Crossref","is-referenced-by-count":5,"title":["The Cap-proximal secondary structures of the 5\u2032UTRs of parainfluenza virus 5 mRNAs specify differential sensitivity to type I interferon and IFIT1"],"prefix":"10.1099","volume":"106","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3107-1501","authenticated-orcid":false,"given":"Jacqueline","family":"Hankinson","sequence":"first","affiliation":[{"name":"Present address: Department of Pathology, Addenbrooke\u2019s Hospital, University of Cambridge, Cambridge, UK"},{"name":"Section for Pathogen Research, Institute for Infection and Immunity, St. George\u2019s 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