The telomeric Cdc13-Stn1-Ten1 complex regulates RNA polymerase II transcription

Nucleic Acids Res. 2019 Jul 9;47(12):6250-6268. doi: 10.1093/nar/gkz279.


Specialized telomeric proteins have an essential role in maintaining genome stability through chromosome end protection and telomere length regulation. In the yeast Saccharomyces cerevisiae, the evolutionary conserved CST complex, composed of the Cdc13, Stn1 and Ten1 proteins, largely contributes to these functions. Here, we report genetic interactions between TEN1 and several genes coding for transcription regulators. Molecular assays confirmed this novel function of Ten1 and further established that it regulates the occupancies of RNA polymerase II and the Spt5 elongation factor within transcribed genes. Since Ten1, but also Cdc13 and Stn1, were found to physically associate with Spt5, we propose that Spt5 represents the target of CST in transcription regulation. Moreover, CST physically associates with Hmo1, previously shown to mediate the architecture of S-phase transcribed genes. The fact that, genome-wide, the promoters of genes down-regulated in the ten1-31 mutant are prefentially bound by Hmo1, leads us to propose a potential role for CST in synchronizing transcription with replication fork progression following head-on collisions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / metabolism*
  • Chromatin / metabolism
  • Chromosomal Proteins, Non-Histone / genetics
  • Chromosomal Proteins, Non-Histone / metabolism*
  • Cyclin-Dependent Kinase-Activating Kinase
  • Cyclin-Dependent Kinases / genetics
  • Gene Expression Regulation, Fungal
  • RNA Polymerase II / metabolism*
  • S Phase / genetics
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Telomere-Binding Proteins / metabolism*
  • Transcription, Genetic*
  • Transcriptional Elongation Factors / metabolism


  • Cdc13 protein, S cerevisiae
  • Cell Cycle Proteins
  • Chromatin
  • Chromosomal Proteins, Non-Histone
  • MRC1 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • Stn1 protein, S cerevisiae
  • TEN1 protein, S cerevisiae
  • Telomere-Binding Proteins
  • Transcriptional Elongation Factors
  • SPT5 transcriptional elongation factor
  • Cyclin-Dependent Kinases
  • SGV1 protein, S cerevisiae
  • RNA Polymerase II
  • Cyclin-Dependent Kinase-Activating Kinase