title: An Integrated Genomic and Immunoinformatic Approach toH. pyloriVaccine Design.
abstract: BACKGROUND
  One useful application of pattern matching algorithms is identification of major histocompatability complex (MHC) ligands and T-cell epitopes. Peptides that bind to MHC molecules and interact with T cell receptors to stimulate the immune system are critical antigens for protection against infectious pathogens. We describe a genomes-to-vaccine approach toH. pylorivaccine design that takes advantage of immunoinformatics algorithms to rapidly identify T-cell epitope sequences from large genomic datasets.
  
  
  RESULTS
  To design a globally relevant vaccine, we used computational methods to identify a core genome comprised of 676 open reading frames (ORFs) from amongst seven genetically and phenotypically diverseH. pyloristrains from around the world. Of the 1,241,153 9-mer sequences encoded by these ORFs, 106,791 were identical amongst all seven genomes and 23,654 scored in the top 5% of predicted HLA ligands for at least one of eight archetypal Class II HLA alleles when evaluated by EpiMatrix. To maximize the number of epitopes that can be assessed experimentally, we used a computational algorithm to increase epitope density in 20-25 amino acid stretches by assembling potentially immunogenic 9-mers to be identically positioned as they are in the native protein antigen. 1,805 immunogenic consensus sequences (ICS) were generated. 79% of selected ICS epitopes bound to a panel of 6 HLA Class II haplotypes, representing >90% of the global human population.
  
  
  CONCLUSIONS
  The breadth ofH. pylorigenome datasets was computationally assessed to rapidly and carefully determine a core set of genes. Application of immunoinformatics tools to this gene set accurately predicted epitopes with promising properties for T cell-based vaccine development.
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Ardito
authors.affiliation: Department of Biomedical and Pharmaceutical Sciences, INBRE Program, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island 02871, USA.
authors.forename: Joanna
authors.initials: J
authors.lastname: Fueyo
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA.
authors.forename: Ryan
authors.initials: R
authors.lastname: Tassone
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA.
authors.forename: Frances
authors.initials: F
authors.lastname: Terry
authors.affiliation: Institute for Immunology and Informatics, University of Rhode Island, Providence, Rhode Island 02903, USA.
authors.forename: Kristen
authors.initials: K
authors.lastname: DaSilva
authors.affiliation: Department of Gastroenterology, Brown University Warren Alpert Medical School, Providence, Rhode Island 02903, USA.
authors.forename: Songhua
authors.initials: S
authors.lastname: Zhang
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA.
authors.forename: William
authors.initials: W
authors.lastname: Martin
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA ; Institute for Immunology and Informatics, University of Rhode Island, Providence, Rhode Island 02903, USA ; Department of Pediatric Infectious Disease, Brown University Warren Alpert Medical School, Providence, Rhode Island 02912, USA.
authors.forename: Anne S
authors.initials: AS
authors.lastname: De Groot
authors.affiliation: Department of Gastroenterology, Brown University Warren Alpert Medical School, Providence, Rhode Island 02903, USA.
authors.forename: Steven F
authors.initials: SF
authors.lastname: Moss
authors.affiliation: EpiVax, Inc., Providence, Rhode Island 02903, USA ; Institute for Immunology and Informatics, University of Rhode Island, Providence, Rhode Island 02903, USA.
authors.forename: Leonard
authors.initials: L
authors.lastname: Moise