Pronounced and extensive microtubule defects in a Saccharomyces cerevisiae DIS3 mutant

Sarah B. Smith, Daniel L. Kiss, Edward Turk, Alan M. Tartakoff, Erik D. Andrulis

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Subunits of the RNA processing exosome assemble into structurally distinct protein complexes that function in disparate cellular compartments and RNA metabolic pathways. Here, in a genetic, cell biological and transcriptomic analysis, we examined the role of Dis3, an essential polypeptide with endo- and 3′ → 5′ exo-ribonuclease activity, in cell cycle progression. We present several lines of evidence that perturbation of DIS3 affects microtubule (MT) localization and structure in Saccharomyces cerevisiae. Cells with a DIS3 mutant: (a) accumulate anaphase and pre-anaphase mitotic spindles; (b) exhibit spindles that are misorientated and displaced from the bud neck; (c) harbour elongated spindle-associated astral MTs; (d) have an increased G 1 astral MT length and number; and (e) are hypersensitive to MT poisons. Mutations in the core exosome genes RRP4 and MTR3 and the exosome cofactor gene MTR4, but not other exosome subunit gene mutants, also elicit MT phenotypes. RNA deep sequencing analysis (RNA-seq) shows broad changes in the levels of cell cycle- and MT-related transcripts in mutant strains. Collectively, the data presented in this study suggest an evolutionarily conserved role for Dis3 in linking RNA metabolism, MTs and cell cycle progression.

Original languageEnglish (US)
Pages (from-to)755-769
Number of pages15
JournalYeast
Volume28
Issue number11
DOIs
StatePublished - Nov 2011

Keywords

  • Dis3
  • Exosome
  • Exozyme
  • Mitosis
  • Mitotic spindle
  • Mtr3

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Genetics

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