Evidence for a role of MCM (mini-chromosome maintenance)5 in transcriptional repression of sub-telomeric and Ty-proximal genes in Saccharomyces cerevisiae

J Biol Chem. 2003 Jul 25;278(30):27372-81. doi: 10.1074/jbc.M301110200. Epub 2003 May 15.

Abstract

The MCM (mini-chromosome maintenance) genes have a well established role in the initiation of DNA replication and in the elongation of replication forks in Saccharomyces cerevisiae. In this study we demonstrate elevated expression of sub-telomeric and Ty retrotransposon-proximal genes in two mcm5 strains. This pattern of up-regulated genes resembles the genome-wide association of MCM proteins to chromatin that was reported earlier. We link the altered gene expression in mcm5 strains to a reversal of telomere position effect (TPE) and to remodeling of sub-telomeric and Ty chromatin. We also show a suppression of the Ts phenotype of a mcm5 strain by the high copy expression of the TRA1 component of the chromatin-remodeling SAGA/ADA (SPT-ADA-GCN5 acetylase/ADAptor). We propose that MCM proteins mediate the establishment of silent chromatin domains around telomeres and Ty retrotransposons.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blotting, Northern
  • Cell Cycle Proteins / physiology*
  • Chromatin / metabolism
  • DNA-Binding Proteins
  • Gene Expression Regulation, Fungal
  • Genome, Fungal
  • Kinetics
  • Micrococcal Nuclease / metabolism
  • Models, Genetic
  • Oligonucleotide Array Sequence Analysis
  • Open Reading Frames
  • Phenotype
  • Retroelements
  • Saccharomyces cerevisiae / metabolism*
  • Schizosaccharomyces pombe Proteins
  • Telomere / ultrastructure*
  • Temperature
  • Time Factors
  • Transcription, Genetic*
  • Transcriptional Activation
  • Up-Regulation

Substances

  • Cell Cycle Proteins
  • Chromatin
  • DNA-Binding Proteins
  • Retroelements
  • Schizosaccharomyces pombe Proteins
  • mcm5 protein, S pombe
  • Micrococcal Nuclease