Analysis of the host-specific haemagglutination of influenza A(H1N1) viruses isolated in the 1995/6 season.
Identifieur interne : 001B88 ( Main/Merge ); précédent : 001B87; suivant : 001B89Analysis of the host-specific haemagglutination of influenza A(H1N1) viruses isolated in the 1995/6 season.
Auteurs : T. Morishita ; E. Nobusawa ; S. Luo ; K. Sato ; S. Nakajima ; K. NakajimaSource :
- Epidemiology and Infection [ 0950-2688 ] ; 1997.
Abstract
Two phenotypes of human influenza A(H1N1) virus are currently circulating in Japan. One (group 1) agglutinates both chicken and goose red blood cells (CRBC and GRBC), the other (group 2) agglutinates GRBC but not CRBC. In the 1995/6 season, group 2 viruses accounted for 70% of the H1N1 viruses isolated in MDCK cells. The 1995/6 viruses were located on two branches of the genetic tree. One branch contained both group 1 and group 2 viruses and the other branch contained only group 2 viruses. Group 2 viruses had aspartic acid at residue 225 in the haemagglutinin (HA) protein, the key amino acid residue for group 2 phenotype. The HA protein of group 1 viruses had a change from aspartic acid to asparagine at residue 225 and the expressed HA protein of these viruses adsorbed CRBC. Serial passage of group 2 viruses in MDCK cells or embryonated chicken eggs caused these viruses to gain the ability to agglutinate CRBC. MDCK-adapted viruses had the same amino acid sequences of HA polypeptide as the original ones, but egg-adapted viruses had changed amino acid sequences. The expressed HA protein from one egg-adapted virus that originally belonged to group 2 adsorbed CRBC.
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PubMed: 9440436
PubMed Central: 2809005
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