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J Virol, March 1998, p. 2132-2140, Vol. 72, No. 3
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Spontaneous and Engineered Deletions in the 3'
Noncoding Region of Tick-Borne Encephalitis Virus: Construction of
Highly Attenuated Mutants of a Flavivirus
Christian W.
Mandl,1,*
Heidemarie
Holzmann,1
Tamara
Meixner,1
Susanne
Rauscher,2
Peter F.
Stadler,2
Steven L.
Allison,1 and
Franz X.
Heinz1
Institute of Virology1
and
Institute of Theoretical
Chemistry,2 University of Vienna, Vienna,
Austria
Received 25 August 1997/Accepted 24 November 1997
The flavivirus genome is a positive-strand RNA molecule containing
a single long open reading frame flanked by noncoding regions (NCR)
that mediate crucial processes of the viral life cycle. The 3' NCR of
tick-borne encephalitis (TBE) virus can be divided into a variable
region that is highly heterogeneous in length among strains of TBE
virus and in certain cases includes an internal poly(A) tract and a
3'-terminal conserved core element that is believed to fold as a whole
into a well-defined secondary structure. We have now investigated the
genetic stability of the TBE virus 3' NCR and its influence on viral
growth properties and virulence. We observed spontaneous deletions in
the variable region during growth of TBE virus in cell culture and in
mice. These deletions varied in size and location but always included
the internal poly(A) element of the TBE virus 3' NCR and never extended
into the conserved 3'-terminal core element. Subsequently, we
constructed specific deletion mutants by using infectious cDNA clones
with the entire variable region and increasing segments of the core
element removed. A virus mutant lacking the entire variable region was
indistinguishable from wild-type virus with respect to cell culture
growth properties and virulence in the mouse model. In contrast, even
small extensions of the deletion into the core element led to
significant biological effects. Deletions extending to nucleotides
10826, 10847, and 10870 caused distinct attenuation in mice without
measurable reduction of cell culture growth properties, which, however,
were significantly restricted when the deletion was extended to
nucleotide 10919. An even larger deletion (to nucleotide 10994)
abolished viral viability. In spite of their high degree of
attenuation, these mutants efficiently induced protective immune
responses even at low inoculation doses. Thus, 3'-NCR deletions
represent a useful technique for achieving stable attenuation of
flaviviruses that can be included in the rational design of novel
flavivirus live vaccines.
*
Corresponding author. Mailing address: Institute of
Virology, Kinderspitalgasse 15, A-1095 Vienna, Austria. Phone: 43-1-404 90, ext. 602. Fax: 43-1-406 21 61. E-mail:
christian.mandl{at}univie.ac.at.
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