Abstract
The sequence of the HA1 subunit region of the haemagglutinin gene of influenza A/USSR/90/77, and A/Brazil/11/78, A/Lackland/3/78, A/England/333/80 and A/India/6263/80 was determined by dideoxy-sequencing methods using total virion RNA and specific oligonucleotide primers for reverse transcriptase. These 1977-1980 strains share a minimum of 85% amino acid sequence homology with influenza A/PR/8/34. Most of the surface amino acid substitutions which occurred during the evolution of A/PR/8/34 to A/USSR/90/77 and subsequently in the 1978-1980 strains are located in the 4 antigenic sites previously defined by an analysis of laboratory-selected mutants of A/PR/8/34. We deduce an evolutionary pathway for the 1977-80 strains and suggest their different epidemic properties may be a consequence of only a few amino acid changes.
MeSH Terms
Antigens, Viral/genetics
Base Sequence
Biological Evolution
Hemagglutination, Viral
Hemagglutinins, Viral/genetics
Influenza A Virus, H1N1 Subtype
Influenza A virus/genetics,immunology
RNA, Viral/genetics
Species Specificity
Virion/genetics
Chemicals
Antigens, Viral
Hemagglutinins, Viral
RNA, Viral
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Raymond F L
Caton A J
Cox N J
Kendal A P
Brownlee G G
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