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Vol. 12, Issue 12, 1982-1991, December 2002

METHODS
Extension and Integration of the Gene Ontology (GO): Combining GO Vocabularies With External Vocabularies

David P. Hill,1 Judith A. Blake, Joel E. Richardson, and Martin Ringwald

Mouse Genome Informatics, The Jackson Laboratory, Bar Harbor, Maine 04609, USA

Structured vocabulary development enhances the management of information in biological databases. As information grows, handling the complexity of vocabularies becomes difficult. Defined methods are needed to manipulate, expand and integrate complex vocabularies. The Gene Ontology (GO) project provides the scientific community with a set of structured vocabularies to describe domains of molecular biology. The vocabularies are used for annotation of gene products and for computational annotation of sequence data sets. The vocabularies focus on three concepts universal to living systems, biological process, molecular function and cellular component. As the vocabularies expand to incorporate terms needed by diverse annotation communities, species-specific terms become problematic. In particular, the use of species-specific anatomical concepts remains unresolved. We present a method for expansion of GO into areas outside of the three original universal concept domains. We combine concepts from two orthogonal vocabularies to generate a larger, more specific vocabulary. The example of mammalian heart development is presented because it addresses two issues that challenge GO; inclusion of organism-specific anatomical terms, and proliferation of terms and relationships. The combination of concepts from orthogonal vocabularies provides a robust representation of relevant terms and an opportunity for evaluation of hypothetical concepts.

1 Corresponding author.

12:1982-1991 ©2002 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/02 $5.00
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