Natural and directed antigenic drift of the H1 influenza virus hemagglutinin stalk domain

Scientific Reports
Christopher S AndersonMarta L DeDiego

Abstract

The induction of antibodies specific for the influenza HA protein stalk domain is being pursued as a universal strategy against influenza virus infections. However, little work has been done looking at natural or induced antigenic variability in this domain and the effects on viral fitness. We analyzed human H1 HA head and stalk domain sequences and found substantial variability in both, although variability was highest in the head region. Furthermore, using human immune sera from pandemic A/California/04/2009 immune subjects and mAbs specific for the stalk domain, viruses were selected in vitro containing mutations in both domains that partially contributed to immune evasion. Recombinant viruses encoding amino acid changes in the HA stalk domain replicated well in vitro, and viruses incorporating two of the stalk mutations retained pathogenicity in vivo. These findings demonstrate that the HA protein stalk domain can undergo limited drift under immune pressure and the viruses can retain fitness and virulence in vivo, findings which are important to consider in the context of vaccination targeting this domain.

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Aug 28, 2018·Expert Review of Vaccines·Federica SiccaAnke Huckriede
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Datasets Mentioned

BETA
FJ966082.1

Methods Mentioned

BETA
PCA
ELISA
ELISAs
X-ray
PCR
PCRs
affinity purification

Software Mentioned

BioPhysConnectoR
R
HyPhy MPI
FactoMineR package

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