TERRA promotes telomerase-mediated telomere elongation in Schizosaccharomyces pombe

EMBO Rep. 2016 Jul;17(7):999-1012. doi: 10.15252/embr.201541708. Epub 2016 May 6.

Abstract

Telomerase-mediated telomere elongation provides cell populations with the ability to proliferate indefinitely. Telomerase is capable of recognizing and extending the shortest telomeres in cells; nevertheless, how this mechanism is executed remains unclear. Here, we show that, in the fission yeast Schizosaccharomyces pombe, shortened telomeres are highly transcribed into the evolutionarily conserved long noncoding RNA TERRA A fraction of TERRA produced upon telomere shortening is polyadenylated and largely devoid of telomeric repeats, and furthermore, telomerase physically interacts with this polyadenylated TERRA in vivo We also show that experimentally enhanced transcription of a manipulated telomere promotes its association with telomerase and concomitant elongation. Our data represent the first direct evidence that TERRA stimulates telomerase recruitment and activity at chromosome ends in an organism with human-like telomeres.

Keywords: TERRA; fission yeast; telomerase; telomere length regulation; transcription.

MeSH terms

  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism*
  • Gene Expression Regulation, Fungal
  • Genome, Fungal
  • Poly A
  • Protein Binding
  • Schizosaccharomyces / genetics*
  • Schizosaccharomyces / metabolism*
  • Telomerase / metabolism*
  • Telomere / genetics*
  • Telomere / metabolism*
  • Telomere Homeostasis*
  • Telomere Shortening
  • Transcription, Genetic

Substances

  • DNA-Binding Proteins
  • Poly A
  • Telomerase