Abstract
The extent of genetic and antigenic variation found in a population of human parainfluenza virus type 1 (HPIV-1) during a single local epidemic was investigated. Fifteen HPIV-1 strains isolated from children in 1991 were analyzed. Nucleotide sequence variation in the hemagglutinin-neuraminidase protein (HN) gene demonstrated two distinct genotypes (genotypes C and D). Unique patterns were identified involving 62 nucleotide and 10 amino acid positions. These patterns represented 40% of all mutations within the HN gene. The remaining mutations were randomly distributed, and 74% involved only one (55%) or two isolates. Genotypes were statistically different from each other at both the nucleotide (P = 0.001) and amino acid (P = 0.001) levels and demonstrated unique potential N-linked glycosylation patterns. Thirty-eight monoclonal antibodies (MAbs) made to four different viral proteins (22 HN, 2 fusion [F], 1 phosphoprotein, and 13 nucleoprotein) (originating from two different genotypes [genotypes A and D]) were compared for their ability to bind to the clinical isolates in enzyme-linked immunosorbent assays (ELISAs) and hemagglutinin-inhibition (HI) assays. Twenty-one MAbs bound well to all clinical isolates in ELISAs and HI assays. The remaining 17 MAbs showed variation in all four structural proteins. Three HN MAbs demonstrated genotype C- and D-specific antigenic and neutralization differences. Evolutionary analysis using parsimony methods confirmed the differences between the two genotypes. No differences in either clinical presentation or disease severity between the two genotypes were found. Geographically localized HPIV-1 epidemics can be caused by at least two distinct genotypes with minor but specific antigenic changes. The clinical and immunologic roles of HPIV-1 genotypes have not been determined.
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