The 5' noncoding region of the type 2 poliovirus vaccine strain contains determinants of attenuation and temperature sensitivity - PubMed (original) (raw)
The 5' noncoding region of the type 2 poliovirus vaccine strain contains determinants of attenuation and temperature sensitivity
A J Macadam et al. Virology. 1991 Apr.
Abstract
Intratypic recombinants of P2/Sabin and P2/117, a neurovirulent vaccine revertant, have been generated in vitro using infectious cDNA clones and used to demonstrate that strong determinants of the attenuation and temperature-sensitive phenotypes of P2/Sabin reside in the 5' 492 nucleotides. In this region of the genome the viruses differ only at nucleotides 437 and 481. The ts phenotype associated with the 5' noncoding region is expressed at different temperatures in different cell lines, suggesting an involvement of cellular factors which may be species specific. Suppression of both the ts and attenuation phenotypes correlates with an A-G mutation at nucleotide 481, although other changes are also involved.
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