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RNA recombination in hepatitis delta virus: implications regarding the abilities of mammalian RNA polymerases.

Abstract：

:Hepatitis delta virus (HDV) requires the surface antigens of hepatitis B virus (HBV) for packaging and transmission, but replicates its RNA in an HBV-independent fashion. HDV contains a 1.7-kb circular RNA genome that is folded into an unbranched rod-like structure via intramolecular base-pairing, and possesses ribozyme activity. The HDV genome does not encode an RNA-dependent RNA polymerase (RdRp), but is instead replicated by host RNA polymerase(s) via a rolling-circle mechanism. As such, HDV is similar to the viroid plant pathogens. Recent findings suggest that HDV can also undergo template-switching recombination, a well-documented process that has been found in a large number of RdRp-encoding RNA viruses and is thought to affect viral evolution and pathogenesis. This mini-review examines HDV RNA recombination and how it may improve our understanding of the capacities of host RNA polymerases beyond typical DNA-directed transcription, and speculates on the role of host RNA polymerase-directed RNA template-switching in the origin of HDV.

journal_name

Virus Res

journal_title

Virus research

authors

Chao M

doi

10.1016/j.virusres.2007.01.003

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

208-15

issue

2

eissn

0168-1702

issn

1872-7492

pii

S0168-1702(07)00004-4

journal_volume

127

pub_type

杂志文章,评审

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