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. 1985 Nov;22(5):719–725. doi: 10.1128/jcm.22.5.719-725.1985

Attenuation of wild-type human influenza A virus by acquisition of the PA polymerase and matrix protein genes of influenza A/Ann Arbor/6/60 cold-adapted donor virus.

M H Snyder, M L Clements, D De Borde, H F Maassab, B R Murphy
PMCID: PMC268513  PMID: 4056002

Abstract

Wild-type influenza A viruses can be attenuated for humans by the acquisition of genes from the A/Ann Arbor/6/60 cold-adapted (ca) donor virus. Six-gene reassortants, that is, viruses containing the hemagglutinin and neuraminidase surface glycoprotein genes of the wild-type virus and the six remaining RNA segments of the ca donor virus, are consistently attenuated for humans. During the production of a six-gene reassortant virus containing the surface glycoproteins of the A/Washington/897/80 (H3N2) wild-type virus, a reassortant virus was isolated that contained RNA segments 3 (coding for the polymerase PA protein) and 7 (coding for matrix [M] proteins) from the ca parent and all other genes from the wild-type virus. This reassortant virus is referred to as a two-gene reassortant. Because the gene or set of genes responsible for the attenuation of ca reassortant viruses has not been defined, we evaluated the two-gene reassortant for level of replication and level of virulence in ferrets and in humans, and we compared its characteristics to those of a six-gene reassortant virus derived from the same two parents. The two-gene reassortant virus infected each of 14 adult seronegative (serum hemagglutination inhibition titer of less than or equal to 1:8) volunteers when administered intranasally at a dose of 10(7) 50% tissue culture infectious doses, yet it did not produce illness. The level of replication of the two-gene reassortant virus in the upper respiratory tract was equivalent to that of the six-gene reassortant virus. This demonstrates that transfer of the A/Ann Arbor/6/60 ca PA polymerase and M genes is sufficient to confer the attenuation phenotype on wild-type influenza A viruses. In the context of previous observations, these results suggest that the A/Ann Arbor/6/60 ca donor virus PA polymerase gene plays a major role in the attenuation of ca reassortant viruses.

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Selected References

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