Synthetic circuit identifies subpopulations with sustained memory of DNA damage

Genes Dev. 2011 Mar 1;25(5):434-9. doi: 10.1101/gad.1994911.

Abstract

Differential responses to stimuli can affect how cells succumb to disease. In yeast, DNA damage can create heterogeneous responses. To delineate how a response contributes to a cell's future behavior, we constructed a transcription-based memory circuit that detects DNA repair to isolate subpopulations with heritable damage responses. Strongly responsive cells show multigenerational effects, including growth defects and iron-associated gene expression. Less-responsive cells exhibit increased mutation frequencies but resume wild-type behavior. These two subpopulations remain distinct for multiple generations, indicating a transmissible memory of damage. Collectively, this work demonstrates the efficacy of using synthetic biology to define how environmental exposure contributes to distinct cell fates.

Publication types

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

MeSH terms

  • Bioengineering*
  • Cell Respiration
  • DNA Damage*
  • Gene Expression Regulation, Fungal
  • Iron / metabolism
  • Mutation
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / genetics

Substances

  • Saccharomyces cerevisiae Proteins
  • Iron