| Literature DB >> 17086204 |
Jean-Marc Aury1, Olivier Jaillon, Laurent Duret, Benjamin Noel, Claire Jubin, Betina M Porcel, Béatrice Ségurens, Vincent Daubin, Véronique Anthouard, Nathalie Aiach, Olivier Arnaiz, Alain Billaut, Janine Beisson, Isabelle Blanc, Khaled Bouhouche, Francisco Câmara, Sandra Duharcourt, Roderic Guigo, Delphine Gogendeau, Michael Katinka, Anne-Marie Keller, Roland Kissmehl, Catherine Klotz, France Koll, Anne Le Mouël, Gersende Lepère, Sophie Malinsky, Mariusz Nowacki, Jacek K Nowak, Helmut Plattner, Julie Poulain, Françoise Ruiz, Vincent Serrano, Marek Zagulski, Philippe Dessen, Mireille Bétermier, Jean Weissenbach, Claude Scarpelli, Vincent Schächter, Linda Sperling, Eric Meyer, Jean Cohen, Patrick Wincker.
Abstract
The duplication of entire genomes has long been recognized as having great potential for evolutionary novelties, but the mechanisms underlying their resolution through gene loss are poorly understood. Here we show that in the unicellular eukaryote Paramecium tetraurelia, a ciliate, most of the nearly 40,000 genes arose through at least three successive whole-genome duplications. Phylogenetic analysis indicates that the most recent duplication coincides with an explosion of speciation events that gave rise to the P. aurelia complex of 15 sibling species. We observed that gene loss occurs over a long timescale, not as an initial massive event. Genes from the same metabolic pathway or protein complex have common patterns of gene loss, and highly expressed genes are over-retained after all duplications. The conclusion of this analysis is that many genes are maintained after whole-genome duplication not because of functional innovation but because of gene dosage constraints.Entities:
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Year: 2006 PMID： 17086204 DOI： 10.1038/nature05230
Source DB: PubMed Journal: Nature ISSN： 0028-0836 Impact factor: 49.962