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Rapid Development of Cell State Identification Circuits with Poly-Transfection
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Synthetic memory circuits for tracking human cell fate.

Devin R Burrill1, Mara C Inniss, Patrick M Boyle

  • 1Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Genes & Development
|July 4, 2012
PubMed
Summary

Scientists developed synthetic biology "memory devices" to track long-term cellular responses to environmental cues. These tools identify and monitor subpopulations of cells, revealing heritable memory of stimuli like hypoxia and DNA damage.

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Area of Science:

  • Synthetic biology
  • Cell biology
  • Genetics

Background:

  • Biological phenomena often involve prolonged cellular responses to transient environmental cues.
  • Assessing heterogeneity in long-term cellular responses at the population level is challenging.
  • Tracking cell fate within specific subpopulations requires advanced biological tools.

Purpose of the Study:

  • To develop a novel synthetic biology approach for identifying and tracking mammalian cell subpopulations.
  • To create biological "memory devices" capable of retaining information about brief environmental stimuli.
  • To investigate heritable memory of cellular responses to stimuli like hypoxia and DNA damage.

Main Methods:

  • Construction of three genomically integrated synthetic gene circuits utilizing bistable autoregulatory transcriptional feedback.
  • Deployment of these "memory devices" to isolate and track progeny of cells exposed to doxycycline, hypoxia, or DNA-damaging agents.
  • Analysis of gene expression, growth rates, and viability in cell subpopulations following stimulus exposure.

Main Results:

  • The synthetic "memory devices" successfully retained memory of brief stimuli exposure.
  • Cells responding to hypoxia or ultraviolet radiation activated the memory device.
  • Activated cells exhibited altered gene expression, growth rates, and viability for multiple generations post-stimulus.

Conclusions:

  • A heritable memory of cellular responses to stimuli such as hypoxia and DNA damage exists in specific subpopulations.
  • These findings demonstrate the utility of synthetic biology for dissecting long-term cellular behaviors and heterogeneity.
  • The developed memory devices offer a powerful tool for studying cell fate and response dynamics.