Measuring semantic similarities by combining gene ontology annotations and gene co-function networks

Peng, Jiajie; Uygun, Sahra; Kim, Taehyong; Wang, Yadong; Rhee, Seung Y.; Chen, Jin

doi:10.1186/s12859-015-0474-7

Title: Measuring semantic similarities by combining gene ontology annotations and gene co-function networks

Journal Article · 14 February 2015 · BMC Bioinformatics

DOI: https://doi.org/10.1186/s12859-015-0474-7 · OSTI ID:1194164

Peng, Jiajie ^[1]; Uygun, Sahra ^[2]; Kim, Taehyong ^[3]; Wang, Yadong ^[4]; Rhee, Seung Y. ^[3]; Chen, Jin ^[5]

Harbin Institute of Technology, Harbin (China); Michigan State Univ., East Lansing, MI (United States); None
Michigan State Univ., East Lansing, MI (United States)
Carnegie Institution for Science, Stanford, CA (United States)
Harbin Institute of Technology, Harbin (China)
Michigan State University, East Lansing, MI (United States)

Background: Gene Ontology (GO) has been used widely to study functional relationships between genes. The current semantic similarity measures rely only on GO annotations and GO structure. This limits the power of GO-based similarity because of the limited proportion of genes that are annotated to GO in most organisms. Results: We introduce a novel approach called NETSIM (network-based similarity measure) that incorporates information from gene co-function networks in addition to using the GO structure and annotations. Using metabolic reaction maps of yeast, Arabidopsis, and human, we demonstrate that NETSIM can improve the accuracy of GO term similarities. We also demonstrate that NETSIM works well even for genomes with sparser gene annotation data. We applied NETSIM on large Arabidopsis gene families such as cytochrome P450 monooxygenases to group the members functionally and show that this grouping could facilitate functional characterization of genes in these families. Conclusions: Using NETSIM as an example, we demonstrated that the performance of a semantic similarity measure could be significantly improved after incorporating genome-specific information. NETSIM incorporates both GO annotations and gene co-function network data as a priori knowledge in the model. Therefore, functional similarities of GO terms that are not explicitly encoded in GO but are relevant in a taxon-specific manner become measurable when GO annotations are limited.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-91ER20021

OSTI ID:: 1194164

Journal Information:: BMC Bioinformatics, Journal Name: BMC Bioinformatics Journal Issue: 1 Vol. 16; ISSN 1471-2105

Publisher:: BioMed CentralCopyright Statement

Country of Publication:: United States

Language:: English

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gene ontology
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