Quartet partitioning reveals hybrid origins of the vertebrate

Michael Syvanen, Bryan Ericksen, Simone Linz, Jonathan M Ducore

Research output: Chapter in Book/Report/Conference proceedingChapter


It is generally accepted that humans and sea urchins are deuterostomes and that fruit flies and jelly fish are outgroups. However, when we analyzed proteins from the genomes of these four species and submitted them to 4 taxa phylogenetic analysis, we found that, while as expected, most of the proteins (563) supported the notion of human and sea urchin in one clade and jelly fish and fruit flies in the other clade (Tree1), a large number of proteins (353) showed human and fruit fly in one clade with the sea urchin and jelly fish in the other (Tree3). Homologs were found in the genomes from 5 other metazoa. Tree1 proteins resulted in the expected 9 taxa tree, while the Tree3 proteins show vertebrates, to the exclusion of the other chordates, in the protostome clade. The two 9 taxa trees were fused into a single most parsimonious net that supports an introgression event between a vertebrate ancestor and a primitive protostome.

Original languageEnglish (US)
Title of host publicationEvolutionary Biology: Genome Evolution, Speciation, Coevolution and Origin of Life
PublisherSpringer International Publishing
Number of pages15
ISBN (Print)9783319076232, 9783319076225
StatePublished - Jan 1 2014

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)


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