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Pronounced and extensive microtubule defects in a Saccharomyces cerevisiae DIS3 mutant. | LitMetric

Pronounced and extensive microtubule defects in a Saccharomyces cerevisiae DIS3 mutant.

Yeast

Department of Molecular Biology and Microbiology, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.

Published: November 2011

AI Article Synopsis

  • The RNA processing exosome consists of subunits that form distinct protein complexes involved in various cellular functions, particularly in RNA metabolism.
  • This study investigates the role of Dis3, a crucial protein with ribonuclease activity, in the cell cycle of yeast (Saccharomyces cerevisiae), revealing that DIS3 mutations disrupt microtubule (MT) organization and function.
  • Evidence from genetic and transcriptomic analyses indicates that Dis3's role is linked to RNA metabolism and cell cycle progression, showing that altered levels of certain transcripts impact MT characteristics and sensitivity to MT-targeting drugs.

Article 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 G1 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367412PMC
http://dx.doi.org/10.1002/yea.1899DOI Listing

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