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1 Department of Medical Microbiology, Center of Infectious Disease, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
2 Department of Molecular Microbiology, Washington University Medical School, St Louis, MO, USA
Correspondence
Peter Bredenbeek
p.j.bredenbeek{at}lumc.nl
Yellow fever virus (YF) is the prototype member of the Flavivirus genus. Here, we report the successful construction of a full-length infectious cDNA clone of the vaccine strain YF-17D. YF cDNA was cloned into a low-copy-number plasmid backbone and stably maintained in several E. coli strains. Transcribed RNAs had a specific infectivity of 105106 p.f.u. (µg RNA)-1, and the resulting virus exhibited growth kinetics, plaque morphology and proteolytic processing similar to the parental virus in cell culture. This clone was used to analyse the importance of conserved flavivirus RNA sequences and the 3' stemloop structure in virus replication. The conserved sequences 5'CS and CS1, as well as the 3' stemloop structure, were found to be essential for virus replication in cell culture, whereas the conserved sequence CS2 and the region containing YF-specific repeated sequences were dispensable. This infectious clone will aid future studies on YF replication and pathogenesis, as well as facilitate the development of YF-17D-based recombinant vaccines.
Present address: Institute for Animal Science and Health (ID-DLO), 8200AB Lelystad, The Netherlands.
Present address: Center for the Study of Hepatitis C, Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, USA.
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