The INO80 chromatin remodeler sustains metabolic stability by promoting TOR signaling and regulating histone acetylation

PLoS Genet. 2018 Feb 20;14(2):e1007216. doi: 10.1371/journal.pgen.1007216. eCollection 2018 Feb.

Abstract

Chromatin remodeling complexes are essential for gene expression programs that coordinate cell function with metabolic status. However, how these remodelers are integrated in metabolic stability pathways is not well known. Here, we report an expansive genetic screen with chromatin remodelers and metabolic regulators in Saccharomyces cerevisiae. We found that, unlike the SWR1 remodeler, the INO80 chromatin remodeling complex is composed of multiple distinct functional subunit modules. We identified a strikingly divergent genetic signature for the Ies6 subunit module that links the INO80 complex to metabolic homeostasis. In particular, mitochondrial maintenance is disrupted in ies6 mutants. INO80 is also needed to communicate TORC1-mediated signaling to chromatin, as ino80 mutants exhibit defective transcriptional profiles and altered histone acetylation of TORC1-responsive genes. Furthermore, comparative analysis reveals subunits of INO80 and mTORC1 have high co-occurrence of alterations in human cancers. Collectively, these results demonstrate that the INO80 complex is a central component of metabolic homeostasis that influences histone acetylation and may contribute to disease when disrupted.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Chromatin Assembly and Disassembly / genetics*
  • Gene Expression Regulation, Fungal
  • Genomic Instability / genetics
  • Histone Acetyltransferases / metabolism*
  • Histones / metabolism*
  • Homeostasis / genetics
  • Metabolic Networks and Pathways / genetics
  • Organisms, Genetically Modified
  • Protein Processing, Post-Translational / genetics
  • Protein Serine-Threonine Kinases / metabolism*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Saccharomyces cerevisiae Proteins / physiology*

Substances

  • Histones
  • INO80 complex, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • Histone Acetyltransferases
  • Protein Serine-Threonine Kinases
  • target of rapamycin protein, S cerevisiae