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. 1992 Aug 1;89(15):7149–7153. doi: 10.1073/pnas.89.15.7149

Structural requirements for RNA editing in hepatitis delta virus: evidence for a uridine-to-cytidine editing mechanism.

J L Casey 1, K F Bergmann 1, T L Brown 1, J L Gerin 1
PMCID: PMC49663  PMID: 1496009

Abstract

Hepatitis delta virus (HDV) nucleotide 1012 is edited from uridine to cytidine in 10-40% of the RNA genomes during replication. This editing event is an important control point in the HDV life cycle because it results in both the packaging of viral RNA and the inhibition of HDV replication. We find that the editing event is highly specific for both the sequences neighboring nucleotide 1012 and the base-paired context of position 1012 within the unbranched rod structure of HDV RNA. Prior studies identified the base transition at nucleotide 1012 but were unable to distinguish between editing of the genomic versus the antigenomic strands [Luo, G. X., Chao, M., Hsieh, S. Y., Sureau, C., Nishikura, K. & Taylor, J. (1990) J. Virol. 64, 1021-1027]. In this study, comparisons of mutations that differentiate between base pairing in genomic and antigenomic RNAs indicate that the genomic strand of HDV is the actual editing substrate. We conclude that the virus uses a uridine to cytidine editing mechanism, which is provided by the host cell.

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Selected References

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