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Engineered E. coli that detect and respond to gut inflammation through nitric oxide sensing
Eric J Archer1, Andra B Robinson, Gürol M Süel
1The University of Texas Southwestern Medical Center, Dallas, TX, USA.
ACS Synthetic Biology
|May 10, 2013
Summary
Engineered bacteria can now detect inflammation. This synthetic biology advance uses a gene circuit in E. coli to permanently respond to nitric oxide, a key inflammatory signal.
Area of Science:
- Synthetic biology
- Microbial engineering
- Genetic circuits
Background:
- Synthetic biology enables microorganisms to perform engineered functions.
- Inflammation is a complex biological response involving various signaling molecules.
- Nitric oxide is a well-characterized mammalian inflammatory signal.
Purpose of the Study:
- To develop an engineered E. coli strain that senses and permanently responds to mammalian inflammatory signals.
- To design a synthetic gene regulatory circuit for detecting nitric oxide.
- To create a permanent genetic switch activated by inflammation.
Main Methods:
- Engineering a synthetic gene regulatory circuit in E. coli.
- Utilizing a DNA recombinase to activate a DNA switch.
- Testing the engineered E. coli's response to chemical nitric oxide donors.
- Validating the response using biological sources like inflamed mouse ileum explants.
Main Results:
- The engineered E. coli strain successfully detected nitric oxide from both chemical and biological sources.
- Permanent DNA recombination (activation of the DNA switch) was observed in response to nitric oxide.
- The synthetic circuit demonstrated a reliable sensing and response mechanism to inflammatory signals.
Conclusions:
- An engineered E. coli strain with a synthetic genetic circuit can reliably detect and respond to nitric oxide, a mammalian inflammatory signal.
- This system provides a permanent genetic memory of inflammatory events.
- Future optimization aims for in vivo detection and response to inflammation.
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