Rooting the Eukaryote Tree by Using a Derived Gene Fusion

See allHide authors and affiliations

Science  05 Jul 2002:
Vol. 297, Issue 5578, pp. 89-91
DOI: 10.1126/science.1071196

You are currently viewing the abstract.

View Full Text


Single-gene trees have failed to locate the root of the eukaryote tree because of systematic biases in sequence evolution. Structural genetic data should yield more reliable insights into deep phylogenetic relationships. We searched major protist groups for the presence or absence of a gene fusion in order to locate the root of the eukaryote tree. In striking contrast to previous molecular studies, we show that all eukaryote groups ancestrally with two cilia (bikonts) are evolutionarily derived. The root lies between bikonts and opisthokonts (animals, Fungi, Choanozoa). Amoebozoa either diverged even earlier or are sister of bikonts or (less likely) opisthokonts.

View Full Text