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Representing the Immune Epitope Database in OWL

This presentation discusses the representation of the Immune Epitope Database (IEDB) in the Web Ontology Language (OWL). It covers the background of immune epitopes, the development cycle of IEDB, ontology development, database design, and content curation. The presentation also explores the challenges of data consistency and the export of IEDB into OWL. Additionally, it highlights future work and acknowledges the contributors to the project.

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Representing the Immune Epitope Database in OWL

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  1. Representing the Immune Epitope Database in OWL Jason A. Greenbaum1, Randi Vita1, Laura Zarebski1, Hussein Emami2, Alessandro Sette1, Alan Ruttenberg3, and Bjoern Peters1 1La Jolla Institute for Allergy and Immunology 2Science Applications International Corporation 3Science Commons

  2. Overview • Background • Immune epitopes • Epitope mapping experiments • The Immune Epitope Database (IEDB) • IEDB development cycle • Ontology development • Database design • Content curation • Database export into OWL

  3. MHC-I cell CD8+ T cell epitopes in viral infection Mouse Virus

  4. T T Proliferation Cytokine Release T MHC-I Cytotoxicity cell CD8+ T cell epitopes in viral infection Mouse Virus TCR CD8 epitope role: the role of a material entity that is realized when it binds to an adaptive immune receptor. adaptive immune response: a GO:immune response resulting from epitope binding by adaptive immune receptor Context is key – What immune receptor? What host? What happened to the host previously (infections? vaccinations? diseases?)…

  5. T T Entities in a epitope mapping experiment • Processes • Administering substance in vivo • Take sample from organism • Perform ELISPOT assay • Transform data • Material entities • Cell • Organism • Peptide • Roles and Functions • Immunogen • Antigen • Antigen presenting cell • Effector cell • Data items • spot count • spot forming cells per million APC 42 SFC/10^6

  6. Epitope discovery contract submission Literature curation IEDBwww.immuneepitope.org The Immune Epitope Database (IEDB) Goal: To catalog and make accessible immune epitope characterizing experiments • 10 full time curators • Content • >6,500 journal articles • >50,000 epitopes • >300,000 experiments • Completed: • 98% infectious disease • 95% allergy • Next: autoimmunity (25%)

  7. Example curated experiment: typically 100 – 300 fields

  8. Example curated experiment: typically 100 – 300 fields

  9. Example curated experiment: typically 100 – 300 fields

  10. Summary I • Immune epitopes are the molecular entities recognized by adaptive immune receptors • The IEDB catalogs experiments defining immune epitopes • Large amounts of complex data, which poses challenges for data consistency

  11. Overview • Background • Immune epitopes • The Immune Epitope Database (IEDB) • IEDB development cycle • Ontology development • Database design • Content curation • Database export into OWL

  12. Development cycle • Ontology development • identify entities and relations • Content curation • add new content • recurate invalid content • Database design • table structure • lookup table values • validation rules

  13. Ontology development (ONTIE) • Re-use terms from OBO foundry candidate ontologies • Native ONTIE terms for entities specific for epitopes  Goal is to find a good home for them Partial high-level ‘is a’ hierarchy Imports from: Gene Ontology Cell Ontology ChEBI, NCBI Taxonomy OBI Protein Ontology Information Artifact Ontology Available: http://ontology.iedb.org/

  14. Database design / implementation • History: • initial design (to get started) • iterative updates (to fix things) • redesign from scratch for 2.0 • because we (still) can • Tables aligned with ontology • Improved understanding between software engineers and domain experts • ‘ontologic normalization’ Ontology terms | Database tables

  15. Content migration and re-curation IEDB 1.0 conditional field-to-field mapping script based re-curation (SQL) Rule based validation first pass: 693,133 inconsistencies IEDB 2.0 3. manual recuration (web interface)

  16. Summary II • Application specific ontology (ONTIE) developed based on OBO foundry principles, and relying heavily on OBI • Database re-designed and structure aligned with the ontology • Data migrated and consistency enforced by rule based validation engine

  17. Overview • Background • Immune epitopes • The Immune Epitope Database (IEDB) • IEDB development cycle • Ontology development • Database design • Content curation • Database export into OWL

  18. Database export into OWL Subset of IEDB 2.0

  19. Advantages of OWL export • Allows to directly use ontology and OWL reasoner to perform consistency checks • Provides expressive query language within the IEDB • Enables query across integrated biomedical databases.

  20. Future Work • Provide IEDB in triple store / access through SPARQL queries • Complete ontology development and OWL export for all data in the IEDB • Overcome technical challenges (Pellet takes 1 minute to classify 100 assays; 300,000 in IEDB…) • Overcome ontological challenges (cells, peptides, negative data, …)

  21. OBI Consortium - http://obi-ontology.org Alan Ruttenberg – Science Commons THANKS! IEDB Team - www.iedb.org SAIC • Scott Stewart • Tom Carolan • Hussein Emami San Diego Supercomputer Center • Phil Bourne • Julia Ponomarenko • Zhanyang Zhu Technical University of Denmark • Ole Lund • Morten Nielsen University of Copenhagen • Søren Buus La Jolla Institute for Allergy & Immunology

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