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Engineering orthogonal synthetic timer circuits based on extracytoplasmic function σ factors.

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Synthetic biology advances with extracytoplasmic function (ECF) σ factors as versatile building blocks for creating tunable

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Area of Science:

  • Synthetic biology and genetic engineering
  • Microbial genetics and molecular biology
  • Systems biology and computational modeling

Background:

  • Rational design of synthetic regulatory circuits requires orthogonal and well-characterized building blocks.
  • Extracytoplasmic function (ECF) σ factors represent the largest group of alternative σ factors with significant potential for synthetic applications.
  • Previous research has not fully explored the potential of ECF σ factors in constructing complex regulatory systems.

Purpose of the Study:

  • To investigate the utility of ECF σ factors as orthogonal regulators in synthetic biology.
  • To benchmark the scalability of assembling ECF σ factors into regulatory cascades for creating 'autonomous timer circuits'.
  • To demonstrate the tuneable time delay and convergent behavior of these circuits in different bacterial species.

Main Methods:

  • Assembly of multiple ECF σ factors into regulatory cascades of varying lengths.
  • Implementation and testing of 'autonomous timer circuits' in Escherichia coli and Bacillus subtilis.
  • Utilizing a computational model to rationalize observed circuit behavior.

Main Results:

  • Demonstrated that ECF σ factors can be assembled into scalable 'autonomous timer circuits'.
  • Showcased tuneable time delays between inducer addition and target gene activation.
  • Observed convergent circuit behavior in both E. coli and B. subtilis, consistent with computational modeling.

Conclusions:

  • ECF σ factors are powerful and versatile building blocks for rational, multi-layered synthetic circuit design.
  • The 'autonomous timer circuits' offer a method for precise temporal control in gene expression.
  • ECF σ factors exhibit universal applicability as orthogonal regulators across diverse bacterial species.