Identification of Ohnolog Genes Originating from Whole Genome Duplication in Early Vertebrates, Based on Synteny Comparison across Multiple Genomes
Evolution after WGD and identification of ohnologs using content-based synteny comparison. The genomes of three lineages sharing a common ancestor are shown. Orthologs and paralogs have been depicted by the same color. The WGD lineage (A) underwent whole genome duplication (B) followed by non-functionalization (C) and genome rearrangements (D) leading to the current intragenomic content-based synteny (I). By contrast, the two outgroup genomes without WGD (E, G) experienced lineage specific genome rearrangements (F, H) leading to 1-to-2 content-based synteny pattern with the WGD lineage (J, K). Note, that some ohnolog pairs (D) are only identified by one of the two outgroups (J or K) due to lineage specific rearrangements.