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Hot spots for modulating toxicity identified by genomic phenotyping and localization mapping

Thomas J Begley1, Ari S Rosenbach, Trey Ideker

  • 1Biological Engineering Division and Center for Environmental Health Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Molecular Cell
|October 8, 2004
PubMed

Insights

New yeast protein pathways protect against carcinogen toxicity. This study identifies novel cellular mechanisms and protein complexes involved in mitigating damage from toxic chemicals.

Area of Science:

  • Cellular Biology
  • Toxicology
  • Proteomics

Background:

  • DNA repair and checkpoint pathways are crucial for protection against carcinogen-induced toxicity.
  • However, additional protective mechanisms remain to be fully elucidated.

Purpose of the Study:

  • To identify novel yeast protein pathways that diminish toxicity induced by known carcinogens.
  • To develop a systems toxicology model for understanding cellular recovery from carcinogen exposure.

Main Methods:

  • Interrogation of 4,733 yeast proteins for their ability to reduce carcinogen toxicity.
  • Development of a computational mapping strategy for global phenotypic data.
  • Integration of phenotypic data with subcellular localization and protein interactome data.

Main Results:

  • Discovery of additional protective pathways beyond the nucleus, including subnetworks in the vacuolar membrane, endosome, endoplasmic reticulum, and mitochondrion.
  • Identification of protein complexes that modulate toxicity.
  • Demonstration that proteins involved in RNA polymerase II, macromolecular trafficking, and vacuole function play a role in mitigating carcinogen toxicity.

Conclusions:

  • Beyond DNA repair, diverse cellular components and pathways contribute to protection against carcinogen toxicity.
  • Systems-level integration of biological data reveals novel toxicological insights and potential therapeutic targets.

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