Translational control of intron splicing in eukaryotes

Olivier Jaillon, Khaled Bouhouche, Jean-François Gout, Jean-Marc Aury, Benjamin Noel, Baptiste Saudemont, Mariusz Nowacki, Vincent Serrano, Betina M. Porcel, Béatrice Ségurens, Anne Le Mouël, Gersende Lepère, Vincent Schächter, Mireille Bétermier, Jean Cohen, Patrick Wincker, Linda Sperling, Laurent Duret and Eric Meyer ()
Additional contact information
Olivier Jaillon: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Khaled Bouhouche: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Jean-François Gout: CNRS, Laboratoire de Biométrie et Biologie Évolutive, UMR 5558, Université de Lyon, Université Lyon 1, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne, France
Jean-Marc Aury: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Benjamin Noel: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Baptiste Saudemont: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Mariusz Nowacki: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Vincent Serrano: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Betina M. Porcel: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Béatrice Ségurens: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Anne Le Mouël: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Gersende Lepère: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France
Vincent Schächter: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Mireille Bétermier: CNRS, Centre de Génétique Moléculaire, UPR 2167, 91198 Gif-sur-Yvette, France
Jean Cohen: CNRS, Centre de Génétique Moléculaire, UPR 2167, 91198 Gif-sur-Yvette, France
Patrick Wincker: Genoscope (CEA), 2 rue Gaston Crémieux CP5706, 91057 Evry, France
Linda Sperling: CNRS, Centre de Génétique Moléculaire, UPR 2167, 91198 Gif-sur-Yvette, France
Laurent Duret: CNRS, Laboratoire de Biométrie et Biologie Évolutive, UMR 5558, Université de Lyon, Université Lyon 1, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne, France
Eric Meyer: École Normale Supérieure, Laboratoire de Génétique Moléculaire, 46 rue d’Ulm, 75005 Paris, France

Nature, 2008, vol. 451, issue 7176, 359-362

Abstract: Abstract Most eukaryotic genes are interrupted by non-coding introns that must be accurately removed from pre-messenger RNAs to produce translatable mRNAs1. Splicing is guided locally by short conserved sequences, but genes typically contain many potential splice sites, and the mechanisms specifying the correct sites remain poorly understood. In most organisms, short introns recognized by the intron definition mechanism2 cannot be efficiently predicted solely on the basis of sequence motifs3. In multicellular eukaryotes, long introns are recognized through exon definition2 and most genes produce multiple mRNA variants through alternative splicing4. The nonsense-mediated mRNA decay5,6 (NMD) pathway may further shape the observed sets of variants by selectively degrading those containing premature termination codons, which are frequently produced in mammals7,8. Here we show that the tiny introns of the ciliate Paramecium tetraurelia are under strong selective pressure to cause premature termination of mRNA translation in the event of intron retention, and that the same bias is observed among the short introns of plants, fungi and animals. By knocking down the two P. tetraurelia genes encoding UPF1, a protein that is crucial in NMD, we show that the intrinsic efficiency of splicing varies widely among introns and that NMD activity can significantly reduce the fraction of unspliced mRNAs. The results suggest that, independently of alternative splicing, species with large intron numbers universally rely on NMD to compensate for suboptimal splicing efficiency and accuracy.

Date: 2008
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DOI: 10.1038/nature06495

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