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Synthetic negative feedback circuits using engineered small RNAs.

Ciarán L Kelly1,2, Andreas W K Harris1, Harrison Steel1

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Synthetic biology now uses small RNAs (sRNAs) to create novel negative feedback circuits. These sRNA-based systems offer precise control and reliable performance in engineered biological systems.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Systems Biology

Background:

  • Negative feedback is crucial for system reliability in biological and engineered systems.
  • Current synthetic biology feedback circuits predominantly use protein-based transcriptional regulation.
  • Small RNAs (sRNAs) are non-coding RNA molecules that regulate gene expression by inhibiting translation.

Purpose of the Study:

  • To model, build, and validate novel synthetic negative feedback circuits utilizing rationally designed small RNAs (sRNAs).
  • To investigate the fine-tuning capabilities and dynamic attributes of sRNA-based feedback mechanisms.
  • To assess the impact of sRNA integration on circuit noise profiles.

Main Methods:

  • Development of two distinct synthetic negative feedback circuits incorporating sRNAs.
  • Utilizing a tet-based autorepressor system with an inducible sRNA for feedback tuning.
  • Designing a direct, closed-loop negative feedback circuit where the output protein induces an sRNA inhibitor.
  • Employing stochastic and deterministic modeling alongside experimental validation.
  • Analyzing circuit noise, response time, and disturbance rejection.

Main Results:

  • Successfully constructed and validated two novel synthetic negative feedback circuits employing sRNAs.
  • Demonstrated precise fine-tuning of circuit output with an inducible sRNA, surpassing the limitations of traditional autorepressors.
  • Showcased a direct, closed-loop negative feedback system with effective regulation.
  • Observed that sRNA incorporation did not significantly increase circuit noise.
  • Validated model predictions against experimental data, enabling simulation of dynamic behaviors.

Conclusions:

  • Rationally designed small RNAs represent a powerful new tool for constructing synthetic negative feedback circuits in biological systems.
  • sRNA-based circuits offer enhanced control and fine-tuning capabilities compared to traditional methods.
  • These novel circuits maintain system stability and reliability without substantial increases in noise, paving the way for advanced synthetic biology applications.