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      RNA editing of hepatitis delta virus antigenome by dsRNA-adenosine deaminase.

      1 , ,
      Nature
      Springer Science and Business Media LLC

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          Abstract

          Hepatitis delta virus (HDV) is a subviral human pathogen that requires hepatitis B virus (HBV) for packaging. Concurrent infection by HBV and HDV increases the risk of severe liver disease compared to infection with HBV alone. The HDV genome is a closed circular RNA of about 1,700 bases which is replicated through an RNA intermediate, the antigenome. Both RNAs can be folded into highly base-paired, rod-shaped structures, similar to the plant viroid RNAs. Two forms of the sole HDV protein, hepatitis delta antigen, are derived from a single open reading frame by RNA editing; the enzymes responsible for the editing have not been characterized. Here we report that the purified enzyme dsRAD (for double-stranded-RNA-adenosine deaminase) can edit HDV antigenomic RNA in vitro. Most important, we observe that mutations in critical sequences of the antigenome have identical effects on in vitro and in vivo editing, suggesting that dsRAD, or a closely related enzyme, is responsible for editing HDV RNA in vivo.

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          Author and article information

          Journal
          Nature
          Nature
          Springer Science and Business Media LLC
          0028-0836
          0028-0836
          Apr 04 1996
          : 380
          : 6573
          Affiliations
          [1 ] Department of Biochemistry and Howard Hughes Medical Institute, University of Utah, Salt Lake City, 84112, USA.
          Article
          10.1038/380454a0
          8602246
          25f234f9-ce30-459f-9a83-30f8488a9170
          History

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