Han JF, Cao RY, Tian X, Yu M, Qin ED, Qin CF. Producing infectious enterovirus type 71 in a rapid strategy.
Virol J 2010;
7:116. [PMID:
20525351 PMCID:
PMC2892457 DOI:
10.1186/1743-422x-7-116]
[Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Accepted: 06/04/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND
Enterovirus 71 (EV71) is an etiologic agent of hand-foot-and-mouth disease (HFMD), and recent HFMD epidemics worldwide have been associated with a severe form of brainstem encephalitis associated with pulmonary edema and high case-fatality rates. EV71 contains a positive-sense single-stranded genome RNA of approximately 7400 bp in length which encodes a polyprotein with a single open reading frame (ORF), which is flanked by untranslated regions at both the 5' and 3' ends.
RESULTS
A long distance RT-PCR assay was developed to amplify the full length genome cDNA of EV71 by using specific primes carrying a SP6 promoter. Then the in vitro synthesized RNA transcripts from the RT-PCR amplicons were then transfected into RD cells to produce the rescued virus. The rescued virus was further characterized by RT-PCR and indirect fluorescent-antibody (IFA) assay in comparison with the wild type virus. The rescued viruses were infectious on RD cells and neurovirulent when intracerebrally injected into suckling mice.
CONCLUSIONS
Thus, we established a rapid method to produce the infectious full length cDNA of EV71 directly from RNA preparations and specific mutations can be easily engineered into the rescued enterovirus genome by this method.
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