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Circular RNAs (circRNAs) represent a class of widespread and diverse covalently closed circular endogenous RNAs that exert crucial functions in regulating gene expression in mammals. However, the function and regulation mechanism of circRNAs in lower vertebrates are still unknown. Here, we discovered a novel circRNA derived from Deltex E3 ubiquitin ligase 1 (Dtx1) gene, namely, circDtx1, which was related to the antiviral responses in teleost fish. Results indicated that circDtx1 playeddoi:10.1371/journal.ppat.1009438 pmid:33735323 fatcat:pox457xivnhibpiihp3uwna6om