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  • Title: [Comparative study of the RNA and proteins of antigenically similar human and animal influenza A viruses].
    Author: Vladimirtseva EA, Agafonova LV, Iamnikova SS, Pysina TV, Kovtun TV.
    Journal: Vopr Virusol; 1981; (1):28-35. PubMed ID: 7257321.
    Abstract:
    In 1976-1979 in various regions of the USSR influenza viruses were isolated from mammals and birds and found to be antigenically similar with human influenza viruses having hemagglutinin H0, H1, and neuraminidase N1. Comparative studies of electrophoretic mobility in polyacrylamide gel of RNAs and proteins of these viruses and human influenza viruses sharing common antigens with them were carried out. By the mobility in gel of genome fragments, the virus isolated from a squirrel, A/squirrel/Vladivostok/1004/79 (H0N1), was found to be similar to human A/PR/8/34 (H0N1) virus; both viruses had a similar polypeptide composition. In contrast, the virus isolated in 1978 from a turkey, A/turkey/Kiev/292/78 (H1N1), by the mobility in gel of genome fragments including those coding for hemagglutinin and neuraminidase differed significantly from antigenically similar epidemic viruses: A/FM/1/47/ (H1N1) and a virus isolated during an epidemic in the same year, A/USSR/90/77/ (H1N1) despite the similarity with the latter in the polypeptide spectrum. Hemagglutinin of a virus isolated in 1976 from blue whales, A/whale/TO/19/76, was serologically identified as HO, neuraminidase of this virus as Nav2. An analysis of genome fragments of the whale virus showed the gene 4 coding for hemagglutinin to be similar by mobility in gel with the corresponding fragment of human influenza virus A/PR/8/34 (H0N1), and the gene 6 coling for neuraminidase in most influenza A viruses to be similar by mobility in gel with the gene 6 of A/pintail/Primorie/695/76 (H2Nav2) virus. An analysis of proteins of this virus by mobility in gel showed all its proteins, with the exception of one with a molecular weight of about 70,000 daltons, to be similar with those of human A/PR/8/34 (H0N1) virus. The protein with the molecular weight of about 70,000 daltons is assumed to be neuraminidase of the second avian type (Nav2). A similar protein was found in avian viruses A/pintail/Primorie/18/76 (H2Nav2), and A/tern/Turkmenia/18/73 (Hav7 Nav2). The antigenic analysis of these strains using a panel of 6 monoclonal antibody to the A/Brazil/11/76 (H1N1) strain revealed a close similarity in the antigenic structure of hemagglutinin of human influenza virus A/USSR/90/77 (H1N1) which had caused an epidemic outbreak in the USSR in 1977-1978 and A/turkey/Kiev/292/78 (H1N1) virus. Human and animal influenza viruses with hemagglutinin of the HO type did not react with any of the 6 clones under study.
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