title: Algorithm of OMA for large-scale orthology inference.
abstract: BACKGROUND
  OMA is a project that aims to identify orthologs within publicly available, complete genomes. With 657 genomes analyzed to date, OMA is one of the largest projects of its kind.
  
  
  RESULTS
  The algorithm of OMA improves upon standard bidirectional best-hit approach in several respects: it uses evolutionary distances instead of scores, considers distance inference uncertainty, includes many-to-many orthologous relations, and accounts for differential gene losses. Herein, we describe in detail the algorithm for inference of orthology and provide the rationale for parameter selection through multiple tests.
  
  
  CONCLUSIONS
  OMA contains several novel improvement ideas for orthology inference and provides a unique dataset of large-scale orthology assignments.
authors.affiliation: ETH Zurich, and Swiss Institute of Bioinformatics, Zurich, Switzerland. alexande@inf.ethz.ch
authors.forename: Alexander C J
authors.initials: AC
authors.lastname: Roth
authors.forename: Gaston H
authors.initials: GH
authors.lastname: Gonnet
authors.forename: Christophe
authors.initials: C
authors.lastname: Dessimoz
mesh_terms: D000465:Algorithms; D019295:Computational Biology / Q000379:methods; D019143:Evolution, Molecular; D023281:Genomics; D016415:Sequence Alignment