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OrthoMCL is a genome-scale algorithm for grouping orthologous protein sequences. It provides not only groups shared by two or more species/genomes, but also groups representing species-specific gene expansion families. So it serves as an important utility for automated eukaryotic genome annotation. OrthoMCL starts with reciprocal best hits within each genome as potential in-paralog/recent paralog pairs and reciprocal best hits across any two genomes as potential ortholog pairs. Related proteins are interlinked in a similarity graph. Then MCL (Markov Clustering algorithm,Van Dongen 2000; www.micans.org/mcl) is invoked to split mega-clusters. This process is analogous to the manual review in COG construction. MCL clustering is based on weights between each pair of proteins, so to correct for differences in evolutionary distance the weights are normalized before running MCL. Template:App Location

Available versions

  • 2.0

Running the application using modules

To use orthomcl with the environment modules system at HPC the following commands are available:

Get module information for orthomcl:

$module spider orthomcl

Load the default application module:

$module load orthomcl

The modulefile for this software adds the directory with executable files to the shell execution PATH and sets the following environment variables:

  • HPC_ORTHOMCL_DIR - directory where orthomcl is located.
  • HPC_ORTHOMCL_BIN - executable directory