Summary auto-generated
This study investigated the antigenic composition of recombinant influenza A viruses created by co-infecting cells with avian and human influenza viruses. Researchers analyzed two recombinant strains using haemagglutination-inhibition, neuraminidase-inhibition, immunoprecipitation, and electrophoresis tests. The recombinant FPV-A2(R4), derived from fowl plague virus and human A2/Singapore/1/57, contained haemagglutinin identical to fowl plague virus but neuraminidase identical to the human A2 virus parent. Similarly, FPV-T/M/65(R4), created from fowl plague virus and turkey influenza virus, showed haemagglutinin from fowl plague and neuraminidase from the turkey virus. Electrophoretic analysis confirmed that recombinant proteins derived from both parents. These findings demonstrate genetic exchange between different influenza A virus strains and suggest that antigenic hybrid viruses can be created through controlled laboratory procedures, with implications for understanding how new virus subtypes may arise naturally in human populations.
Key findings
- Recombinant virus FPV-A2(R4) contained fowl plague virus haemagglutinin combined with human A2 neuraminidase, demonstrating genetic exchange between parent viruses
- Similar antigenic segregation occurred in FPV-T/M/65(R4), containing fowl plague haemagglutinin with turkey influenza neuraminidase
- Electrophoretic analysis confirmed recombinant viruses contained structural proteins derived from both parent viruses
- Isolated neuraminidase from recombinants was antigenically identical to human A2 neuraminidase, ruling out steric hindrance explanations
- Laboratory creation of influenza virus hybrids with predetermined antigenic combinations is feasible and may model natural genetic interactions between human and avian influenza viruses
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Abstract
The antigenic structure of a recombinant virus, FPV-A2 (R4), obtained by the interaction of an avian and a human influenza A virus was investigated by means of haemagglutination-inhibition, neuraminidase-inhibition and immunoprecipitation tests. The neuraminidase of the recombinant was found to be antigenically identical to that of its A2/SINGAPORE/1/57 parent whilst its haemagglutinin was identical to that of fowl plague virus, the other parent. Similar studies on a recombinant obtained by the interaction of two avian influenza A virus strains, fowl plague virus and A/turkey/MASSACHUSETTS/65 virus, indicated that it contained neuraminidase of the antigenic type found in the turkey virus and haemagglutinin like that of fowl plague virus. A/turkey/MASSACHUSETTS/65 was selected for study since its neuraminidase is antigenically closely related to that of human A2 virus strains.
Studies on the electrophoretic mobilities of the structural proteins of FPV-A2 (R4) indicated that it contained structural components derived from each parent and thus supported the immunological findings.
The significance of these findings in relation to possible genetic interactions between human and avian influenza viruses in nature is discussed.
* Present address: Department of Veterinary Science, University of Wisconsin, Madison, Wisconsin, U.S.A.
† On leave of absence from Department of Microbiology, John Curtin School of Medical Research, Australian National University, Canberra, Australia.