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Title: West nile virus T-cell ligand sequences shared with other flaviviruses: A multitude of variant sequences as potential altered peptide ligands
Authors: Keun Ok Jung
Asif M. Khan
Benjamin Yong Liang Tan
Yongli Hu
Gregory G. Simon
Eduardo J.M. Nascimento
Francois Lemonnier
Vladimir Brusic
Olivo Miotto
Tin Wee Tan
Ernesto T.A. Marques
Rafael Dhalia
Jerome Salmon
J. Thomas August
The Johns Hopkins School of Medicine
Perdana University Graduate School of Medicine
Yong Loo Lin School of Medicine
University of Pittsburgh
Institut Pasteur, Paris
Dana-Farber Cancer Institute
Mahidol University
Aggeu Magalhães Research Center
Institut de Cancerologie Gustave Roussy
Keywords: Agricultural and Biological Sciences;Immunology and Microbiology
Issue Date: 1-Jul-2012
Citation: Journal of Virology. Vol.86, No.14 (2012), 7616-7624
Abstract: Phylogenetic relatedness and cocirculation of several major human pathogen flaviviruses are recognized as a possible cause of deleterious immune responses to mixed infection or immunization and call for a greater understanding of the inter-Flavivirus protein homologies. This study focused on the identification of human leukocyte antigen (HLA)-restricted West Nile virus (WNV) T-cell ligands and characterization of their distribution in reported sequence data of WNV and other flaviviruses. H-2-deficient mice transgenic for either A2, A24, B7, DR2, DR3, or DR4 HLA alleles were immunized with overlapping peptides of the WNV proteome, and peptide-specific T-cell activation was measured by gamma interferon (IFN-γ) enzyme-linked immunosorbent spot (ELISpot) assays. Approximately 30% (137) of the WNV proteome peptides were identified as HLA-restricted T-cell ligands. The majority of these ligands were conserved in ~ > 88% of analyzed WNV sequences. Notably, only 51 were WNV specific, and the remaining 86, chiefly of E, NS3, and NS5, shared an identity of nine or more consecutive amino acids with sequences of 64 other flaviviruses, including several major human pathogens. Many of the shared ligands had an incidence of > 50% in the analyzed sequences of one or more of six major flaviviruses. The multitude of WNV sequences shared with other flaviviruses as interspecies variants highlights the possible hazard of defective T-cell activation by altered peptide ligands in the event of dual exposure to WNV and other flaviviruses, by either infection or immunization. The data suggest the possible preferred use of sequences that are pathogen specific with minimum interspecies sequence homology for the design of Flavivirus vaccines. © 2012, American Society for Microbiology.
ISSN: 10985514
Appears in Collections:Scopus 2011-2015

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