Downloaded from genome.cshlp.org on September 26, 2021 - Published by Cold Spring Harbor Laboratory Press Early vertebrate whole genome duplications were predated by a period of intense genome rearrangement Andrew L. Hufton1, Detlef Groth1,2, Martin Vingron1, Hans Lehrach1, Albert J. Poustka1, Georgia Panopoulou1* 1. Max Planck for Molecular Genetics, Ihnestr. 73, 12169 Berlin, Germany. 2. Potsdam University, Bioinformatics Group, c/o Max Planck Institute of Molecular Plant Physiology, Am Muehlenberg 1, D-14476 Potsdam-Golm, Germany * Corresponding author: Max-Planck Institut für Molekulare Genetik, Ihnestrasse 73, D- 14195 Berlin Germany. email:
[email protected], Tel: +49-30-84131235, Fax: +49- 30-84131128 Running title: Early vertebrate genome duplications and rearrangements Keywords: synteny, amphioxus, genome duplications, rearrangement rate, genome instability Downloaded from genome.cshlp.org on September 26, 2021 - Published by Cold Spring Harbor Laboratory Press Hufton et al. Abstract Researchers, supported by data from polyploid plants, have suggested that whole genome duplication (WGD) may induce genomic instability and rearrangement, an idea which could have important implications for vertebrate evolution. Benefiting from the newly released amphioxus genome sequence (Branchiostoma floridae), an invertebrate which researchers have hoped is representative of the ancestral chordate genome, we have used gene proximity conservation to estimate rates of genome rearrangement throughout vertebrates and some of their invertebrate ancestors. We find that, while amphioxus remains the best single source of invertebrate information about the early chordate genome, its genome structure is not particularly well conserved and it cannot be considered a fossilization of the vertebrate pre- duplication genome. In agreement with previous reports, we identify two WGD events in early vertebrates and another in teleost fish.