Widespread Paleopolyploidy in Model Plant Species Inferred from Age Distributions of Duplicate Genes

doi:10.1105/tpc.021345

Widespread Paleopolyploidy in Model Plant Species Inferred from Age Distributions of Duplicate Genes

Guillaume Blanc^a^,b^,1 and Kenneth H. Wolfe^a

^a Department of Genetics, Smurfit Institute, University of Dublin, Trinity College, Dublin 2, Ireland
^b Laboratoire Information Génomique et Structurale, Centre National de la Recherche Scientifique UPR 2589, 13402 Marseille Cedex 20, France

^¹ To whom correspondence should be addressed. E-mail g_blanc{at}univ-perp.fr; fax 33-4-91164549.

It is often anticipated that many of today's diploid plant speciesare in fact paleopolyploids. Given that an ancient large-scaleduplication will result in an excess of relatively old duplicatedgenes with similar ages, we analyzed the timing of duplicationof pairs of paralogous genes in 14 model plant species. UsingEST contigs (unigenes), we identified pairs of paralogous genesin each species and used the level of synonymous nucleotidesubstitution to estimate the relative ages of gene duplication.For nine of the investigated species (wheat [Triticum aestivum],maize [Zea mays], tetraploid cotton [Gossypium hirsutum], diploidcotton [G. arboretum], tomato [Lycopersicon esculentum], potato[Solanum tuberosum], soybean [Glycine max], barrel medic [Medicagotruncatula], and Arabidopsis thaliana), the age distributionsof duplicated genes contain peaks corresponding to short evolutionaryperiods during which large numbers of duplicated genes wereaccumulated. Large-scale duplications (polyploidy or aneuploidy)are strongly suspected to be the cause of these temporal peaksof gene duplication. However, the unusual age profile of tandemgene duplications in Arabidopsis indicates that other scenarios,such as variation in the rate at which duplicated genes aredeleted, must also be considered.

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[Abstract] [Full Text] [PDF]

N. A. Eckardt
Two Genomes Are Better Than One: Widespread Paleopolyploidy in Plants and Evolutionary Effects
PLANT CELL, July 1, 2004; 16(7): 1647 - 1649.
[Full Text] [PDF]