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Research Article

Genetically engineered foot-and-mouth disease viruses with poly(C) tracts of two nucleotides are virulent in mice.

E Rieder, T Bunch, F Brown, P W Mason
E Rieder
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T Bunch
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F Brown
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P W Mason
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ABSTRACT

To determine the role of the poly(C) tract found at the 5' end of the genome of foot-and-mouth disease virus, synthetic RNAs (in vitro transcripts) with poly(C) tracts of different lengths have been produced and evaluated. RNAs with poly(C) tracts of 35, 25, 16, 6, or 2 residues displayed similar specific infectivities in baby hamster kidney (BHK) cells. Viruses recovered from cells transfected with in vitro transcripts containing 6 to 35 Cs had properties similar to those of the wild-type virus in cell culture, and poly(C) tracts present in the synthetic RNA-derived viruses ranged from 75 to 140 bases in length. Viruses recovered from transcripts containing only two Cs showed very different properties. Specifically, viruses grew to much lower levels in cell culture and maintained a poly(C) tract of only two residues. The pool of viruses harvested from cells transfected with the synthetic C2 RNA also contained a small amount of a virus with a 42-base deletion in the region of the poly(C) tract, which appeared to have arisen by recombination. Taken together, these data suggest that recombination provides the mechanism of poly(C) elongation and that viruses with poly(C) tracts over 75 bases in length have a selective advantage in cell culture. Interestingly, all of the in vitro transcript-derived viruses [including viruses with poly(C) tracts of only two residues] were equally virulent in mice, indicating that poly(C) tract length has no effect on virulence in this animal model.

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Genetically engineered foot-and-mouth disease viruses with poly(C) tracts of two nucleotides are virulent in mice.
E Rieder, T Bunch, F Brown, P W Mason
Journal of Virology Sep 1993, 67 (9) 5139-5145; DOI:

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Genetically engineered foot-and-mouth disease viruses with poly(C) tracts of two nucleotides are virulent in mice.
E Rieder, T Bunch, F Brown, P W Mason
Journal of Virology Sep 1993, 67 (9) 5139-5145; DOI:
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