Transcriptional silencing at Saccharomyces telomeres: Implications for other organisms

Wai Hong Tham, Virginia A. Zakian

Research output: Contribution to journalReview articlepeer-review

119 Scopus citations

Abstract

Telomeres are the natural ends of eukaryotic chromosomes. In most organisms, telomeres consist of simple, repeated DNA with the strand running 5′ to 3′ towards the end of the chromosome being rich in G residues. In cases where the very end of the chromosome has been examined, the G-strand is extended to form a short, single stranded tail. The chromatin structure of telomeric regions often has features that distinguish them from other parts of the genome. Because telomeres protect chromosome ends from degradation and end-to-end fusions and prevent the loss of terminal DNA by serving as a substrate for telomerase, they are essential for the stable maintenance of eukaryotic chromosomes. In addition to their essential functions, telomeres in diverse organisms are specialized sites for gene expression. Transcription of genes located next to telomeres is repressed, a phenomenon termed telomere position effect (TPE). TPE is best characterized in the yeast Saccharomyces cerevisiae. This article will focus on the silencing properties of Saccharomyces telomeres and end with speculation on the role of TPE in yeasts and other organisms.

Original languageEnglish (US)
Pages (from-to)512-521
Number of pages10
JournalOncogene
Volume21
Issue number4 REV. ISS. 1
DOIs
StatePublished - Jan 21 2002

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cancer Research

Keywords

  • Heterochromatin
  • Ku complex
  • Sir proteins
  • TPE
  • Telomerase
  • Telomere

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