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. 1987 Apr;84(7):2019–2023. doi: 10.1073/pnas.84.7.2019

Comparison of the virulent Asibi strain of yellow fever virus with the 17D vaccine strain derived from it.

C S Hahn, J M Dalrymple, J H Strauss, C M Rice
PMCID: PMC304575  PMID: 3470774

Abstract

We have sequenced the virulent Asibi strain of yellow fever virus and compared this sequence to that of the 17D vaccine strain, which was derived from it. These two strains of viruses differ by more than 240 passages. We found that the two RNAs, 10,862 nucleotides long, differ at 68 nucleotide positions; these changes result in 32 amino acid differences. Overall, this corresponds to 0.63% nucleotide sequence divergence, and the changes are scattered throughout the genome. The overall divergence at the level of amino acid substitution is 0.94%, but these changes are not randomly distributed among the virus protein. The capsid protein is unchanged, while proteins NS1, NS3, and NS5 contain 0.5% amino acid substitutions, and proteins ns4a and ns4b average 0.8% substitutions. In contrast, proteins ns2a and ns2b have 3.0 and 2.3% amino acid divergence, respectively. The envelope protein also has a relatively high rate of amino acid change of 2.4% (a total of 12 amino acid substitutions). The large number of changes in ns2a and ns2b, which are largely conservative in nature, may result from lowered selective pressure against alteration in this region; among flaviviruses, these polypeptides are much less highly conserved than NS1, NS3, and NS5. However, many of the amino acid substitutions in the E protein are not conservative. It seems likely that at least some of the difference in virulence between the two strains of yellow fever virus results from changes in the envelope protein that affect virus binding to host receptors. Such differences in receptor binding could result in the reduced neurotropism and vicerotropism exhibited by the vaccine strain.

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Selected References

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