title: hpr1Delta affects ribosomal DNA recombination and cell life span in Saccharomyces cerevisiae.
abstract: Multiple genetic pathways have been shown to regulate life span and aging in the yeast Saccharomyces cerevisiae. Here we show that loss of a component of the RNA polymerase II complex, Hpr1p, results in a decreased life span. Although hpr1Delta mutants have an increased rate of recombination within the ribosomal DNA (rDNA) array, this is not accompanied by an increase in extrachromosomal rDNA circles (ERCs). Analyses of mutants that affect replication of the rDNA array and suppressors that reverse the phenotypes of the hpr1Delta mutant show that the reduced life span is associated with increased genomic instability but not with increased ERC formation. The hpr1Delta mutant acts in a pathway distinct from previously described mutants that reduce life span.
authors.affiliation: Department of Biochemistry and Kaplan Comprehensive Cancer Center, New York University School of Medicine, New York, New York 10016, USA.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Merker
authors.forename: Hannah L
authors.initials: HL
authors.lastname: Klein
mesh_terms: D004265:DNA Helicases / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics*; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000235:genetics*; D005800:Genes, Fungal; D006655:Histone Deacetylases / Q000235:genetics; D009154:Mutation; D009687:Nuclear Proteins; D010641:Phenotype; D053484:RecQ Helicases; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000166:cytology* / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D056565:Sirtuin 2; D037761:Sirtuins; D013997:Time Factors; D015534:Trans-Activators / Q000235:genetics
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D004268:DNA-Binding Proteins; C105579:FOB1 protein, S cerevisiae; D005656:Fungal Proteins; C063494:HPR1 protein, S cerevisiae; D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D015534:Trans-Activators; C087778:SIR2 protein, S cerevisiae; D056565:Sirtuin 2; D037761:Sirtuins; D006655:Histone Deacetylases; C090472:SGS1 protein, S cerevisiae; D004265:DNA Helicases; D053484:RecQ Helicases