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- W2073455865 abstract "Background Enterovirus 71 (EV71) has emerged as a neuroinvasive virus responsible for several large outbreaks in the Asia-Pacific region while virulence determinant remains unexplored. Principal Findings In this report, we investigated increased virulence of unadapted EV71 clinical isolate 237 as compared with isolate 4643 in mice. A fragment 12 nucleotides in length in stem loop (SL) II of 237 5′-untranslated region (UTR) visibly reduced survival time and rate in mice was identified by constructing a series of infectious clones harboring chimeric 5′-UTR. In cells transfected with bicistronic plasmids, and replicon RNAs, the 12-nt fragment of isolate 237 enhanced translational activities and accelerated replication of subgenomic EV71. Finally, single nucleotide change from cytosine to uridine at base 158 in this short fragment of 5′-UTR was proven to reduce viral translation and EV71 virulence in mice. Results collectively indicated a pivotal role of novel virulence determinant C158 on virus translation in vitro and EV71 virulence in vivo. Conclusions These results presented the first reported virulence determinant in EV71 5′-UTR and first position discovered from unadapted isolates." @default.
- W2073455865 created "2016-06-24" @default.
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- W2073455865 date "2011-11-01" @default.
- W2073455865 modified "2023-10-16" @default.
- W2073455865 title "A Single Nucleotide in Stem Loop II of 5′-Untranslated Region Contributes to Virulence of Enterovirus 71 in Mice" @default.
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- W2073455865 doi "https://doi.org/10.1371/journal.pone.0027082" @default.
- W2073455865 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3206083" @default.
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