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J. Virol., 12 1996, 8606-8613, Vol 70, No. 12
G Meyers, N Tautz, P Becher, HJ Thiel and BM Kummerer
After cDNA cloning of the genome of bovine viral diarrhea virus (BVDV)
isolate CP7, a full-length cDNA clone was constructed. RNA transcribed in
vitro from this construct was shown to direct the generation of infectious
BVDV upon transfection into bovine cells. To confirm the de novo generation
of infectious BVDV from cloned cDNA a genetically tagged virus was
constructed. In comparison with parental BVDV, the recombinant virus was
slightly retarded in growth. The NS2 coding region of the CP7 genome
contains a duplication of 27 nucleotides which is not present in the genome
of its noncytopathogenic counterpart, NCP7. Exchange of a small fragment
harboring this insertion against the corresponding part of the NCP7
sequence led to recovery of noncytopathogenic BVDV. Alteration of the
construct by introduction of a fragment derived from a cytopathogenic BVDV
defective interfering particle resulted in a chimeric defective interfering
particle which exhibits a cytopathogenic phenotype. These findings confirm
the hypothesis that the recombination-induced alterations in the genomes of
cytopathogenic BVDV are responsible for the induction of cell lysis.
Copyright © 1996, American Society for Microbiology
Recovery of cytopathogenic and noncytopathogenic bovine viral diarrhea viruses from cDNA constructs [published erratum appears in J Virol 1997 Feb;71(2):1735]
Department of Clinical Virology, Federal Research Centre for Virus Diseases of Animals, Tubingen, Germany. gregor.meyers@tue.bfav.de
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