Ontologies Working Group Agenda MGED3 1.Goals for working group. 2.Primer on ontologies 3.Working group progress 4.Example sample descriptions from different.

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Presentation transcript:

Ontologies Working Group Agenda MGED3 1.Goals for working group. 2.Primer on ontologies 3.Working group progress 4.Example sample descriptions from different species 5.Ontology for MIAME/MAML 6.Working group future

Ontologies Working Group Goals Collect controlled vocabularies for sample descriptions. Define microarray concepts and their relationships. Provide bridge to ontologies from other knowledge domains.

What is an Ontology? An ontology is a specification of a conceptualization that is designed for reuse across multiple applications and implementations. …a specification of a conceptualization is a written, formal description of a set of concepts and relationships in a domain of interest. Peter Karp (2000) Bioinformatics 16:269

Ontologies in Gene Expression Databases Controlled vocabulary –Define relationships through hierarchy (e.g., taxonomy) Schema –Concepts as objects or relational tables –Attributes and data types provide specification –Relationships specified through subclassing (objects) or foreign keys (relational tables) Knowledge representation –Link to other domains (gene sequence annotation, gene and protein roles, pathways) –Facilitate data exchange by mapping common concepts

Anatomy Hierarchy

RelExperiments Experiment Tables Experiment ExpGroupsGroups Exp.ControlGenes ControlGenes Hybridization Conditions Label Sample TreatmentDisease Devel. Stage ExperimentSample Anatomy Taxon

MAML DTD -> UML mapping: Array platform

Other Domains Gene descriptions (Gene Ontology) –Molecular function –Biological process –Subcellular localization Cellular and biochemical pathways (EcoCyc) Literature (MeSH) Phenotypes Others … Requires common set of terms (semantic mapping) Or shared usage of identifiers (e.g. GenBank accessions)

Ontology Working Group Progress Critical concepts identified –Alternative relationships discussed Web site for information –Beginnings of central repository Application to sample descriptions –Different species

Example Sample Descriptions Human Mouse Arabidopsis

MIAME Ontology Define MIAME concepts and their relationships incorporating MAML. The goal is to generate a document that will provide a clear and common understanding of what should be reported and how. The tables are a draft to form the basis for such a document. Located at Ontology Working Group home page.

Ontology Working Group Future Official group leader Next meeting? Assignments to group members