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Originally published as Genetics Published Articles Ahead of Print on July 2, 2006.

Genetics, Vol. 174, 511-518, September 2006, Copyright © 2006
doi:10.1534/genetics.106.058560

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Introns Regulate RNA and Protein Abundance in Yeast

Kara Juneau*,{dagger},1, Molly Miranda{dagger}, Maureen E. Hillenmeyer{dagger},{ddagger}, Corey Nislow{dagger},§ and Ronald W. Davis*,{dagger}

* Department of Biochemistry, Stanford University School of Medicine, Stanford, California 94305, {dagger} Stanford Genome Technology Center, Stanford University, Palo Alto, California 94304, {ddagger} Biomedical Informatics, Stanford University School of Medicine, Stanford, California 94305 and § Department of Biochemistry, Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario, Canada M5S 3E1

1 Corresponding author: Stanford Genome Technology Center, 855 California Ave., Palo Alto, CA 94304-1103.
E-mail: kjuneau{at}stanford.edu

The purpose of introns in the architecturally simple genome of Saccharomyces cerevisiae is not well understood. To assay the functional relevance of introns, a series of computational analyses and several detailed deletion studies were completed on the intronic genes of S. cerevisiae. Mining existing data from genomewide studies on yeast revealed that intron-containing genes produce more RNA and more protein and are more likely to be haplo-insufficient than nonintronic genes. These observations for all intronic genes held true for distinct subsets of genes including ribosomal, nonribosomal, duplicated, and nonduplicated. Corroborating the result of computational analyses, deletion of introns from three essential genes decreased cellular RNA levels and caused measurable growth defects. These data provide evidence that introns improve transcriptional and translational yield and are required for competitive growth of yeast.


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