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Researchers engineered bacteria to detect gut signals, expanding tools for disease diagnosis and treatment. This work identifies new biosensor triggers for engineered bacteria in the gut environment.

Keywords:
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Area of Science:

  • Synthetic biology
  • Microbial engineering
  • Gut microbiome research

Background:

  • Engineering synthetic circuits in intestinal bacteria offers a novel approach for disease diagnosis, treatment, and prevention.
  • The limited availability of known biosensors restricts the development of disease-responsive engineered bacteria.
  • Expanding the repertoire of bacterial biosensors is crucial for enhancing their sensing and response capabilities within the host environment.

Purpose of the Study:

  • To identify novel bacterial biosensor triggers responsive to signals in the healthy and diseased mammalian gut.
  • To develop a platform for rapid, systems-level screening of biosensor triggers.
  • To enable the construction of diagnostic and therapeutic circuits using engineered bacteria.

Main Methods:

  • Utilized a genetic memory circuit in Escherichia coli for screening.
  • Developed a pipeline for rapid library construction and screening using next-generation sequencing and computational analysis.
  • Tested libraries of promoter-ribosome binding site (RBS) combinations, incorporating RBS variation to optimize sensitivity.

Main Results:

  • Successfully identified and validated novel biosensor triggers that selectively activate the synthetic memory circuit in the gut.
  • Discovered biosensor triggers with enhanced responses in an inflamed gut model through comparative screening.
  • Demonstrated the reliability of systems-level screening for identifying responsive biosensor triggers from pooled libraries.

Conclusions:

  • Systems-level screening is a powerful method for discovering novel gut-specific biosensor triggers.
  • The developed platform facilitates disease-specific screening, advancing the understanding and clinical management of intestinal diseases.
  • This work expands the toolkit for engineered probiotics, paving the way for more complex synthetic biology applications in the gut.