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J. Virol., Dec 1995, 7593-7600, Vol 69, No. 12
JL Casey and JL Gerin
RNA editing plays a central role in the life cycle of hepatitis D virus
(HDV), a subviral human pathogen. Previous studies (J.L. Casey, K.F.
Bergmann, T.L. Brown, and J.L. Gerin, Proc. Natl. Acad. Sci USA 89:7149-
7153, 1992; H. Zheng, T.-B. Fu, D. Lazinski, and J. Taylor, J. Virol.
66:4693-4697, 1992) had concluded that the genomic RNA of HDV was the
target for RNA editing and that the editing reaction was a conversion of U
to C. However, we show here that the antigenomic RNA of HDV is in fact the
target for HDV RNA editing, which is therefore a conversion of A to G. This
result is verified by using an assay specific for editing on the
antigenomic RNA and by analyzing the editing of site-directed mutant RNAs
in transfected cells and in cell extracts. Because editing occurs in the
absence of viral antigens and the specificity for the HDV editing target
site is present even in extracts from Drosophila cells, it is likely that
HDV RNA is edited by one or more cellular factors that are conserved among
higher eukaryotes. These results raise the likelihood that double-stranded
RNA adenosine deaminase specifically edits HDV antigenomic RNA.
Copyright © 1995, American Society for Microbiology
Hepatitis D virus RNA editing: specific modification of adenosine in the antigenomic RNA
Division of Molecular Virology and Immunology, Georgetown University Medical Center, Rockville, Maryland 20852, USA.
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