title: Ribosomal DNA transcription-dependent processes interfere with chromosome segregation.
abstract: The ribosomal DNA (rDNA) is a specialized genomic region not only owing to its function as the nucleolar organizing region (NOR) but also because it is repetitive in nature and, at least in budding yeast, silenced for polymerase II (Pol II)-mediated transcription. Furthermore, cohesin-independent linkages hold the sister chromatids together at the rDNA loci, and their resolution requires the activity of the conserved protein phosphatase Cdc14. Here we show that rRNA transcription-dependent processes establish linkages at the rDNA, which affect segregation of this locus. Inactivation of Cfi1/Net1, a protein required for efficient rRNA transcription, or elimination of Pol I activity, which drives rRNA transcription, diminishes the need for CDC14 in rDNA segregation. Our results identify Pol I transcription-dependent processes as a novel means of establishing linkages between chromosomes.
authors.affiliation: Center for Cancer Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, E17-233, 40 Ames Street, Cambridge, MA 02139, USA.
authors.forename: Brett N
authors.initials: BN
authors.lastname: Tomson
authors.forename: Damien
authors.initials: D
authors.lastname: D'Amours
authors.forename: Brittany S
authors.initials: BS
authors.lastname: Adamson
authors.forename: Luis
authors.initials: L
authors.lastname: Aragon
authors.forename: Angelika
authors.initials: A
authors.lastname: Amon
mesh_terms: D018797:Cell Cycle Proteins / Q000378:metabolism; D020090:Chromosome Segregation / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D015825:Chromosomes, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics*; D004789:Enzyme Activation; D017353:Gene Deletion; D009154:Mutation / Q000235:genetics; D009687:Nuclear Proteins / Q000378:metabolism; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism; D011760:Pyrrolidinones / Q000494:pharmacology; D012318:RNA Polymerase I / Q000378:metabolism; D011995:Recombination, Genetic / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000166:cytology; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism; D013489:Suppression, Genetic; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: C074860:CDC14 protein, S cerevisiae; D018797:Cell Cycle Proteins; D004275:DNA, Ribosomal; C119300:Net1 protein, S cerevisiae; D009687:Nuclear Proteins; D011760:Pyrrolidinones; D029701:Saccharomyces cerevisiae Proteins; C006361:acetopyrrothine; D012318:RNA Polymerase I; D017027:Protein Tyrosine Phosphatases