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Control of Eating Behavior Using a Novel Feedback System
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A universal biomolecular integral feedback controller for robust perfect adaptation.

Stephanie K Aoki1, Gabriele Lillacci1, Ankit Gupta1

  • 1Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland.

Nature
|June 21, 2019
PubMed
Summary
This summary is machine-generated.

Researchers engineered a synthetic integral feedback controller for robust biological regulation. This breakthrough enables perfect adaptation in living cells, overcoming previous synthetic biology challenges.

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Area of Science:

  • Synthetic Biology
  • Systems Biology
  • Control Theory

Background:

  • Homeostasis ensures biological variables adapt to environmental changes using integral control.
  • Synthetic realization of integral feedback has been challenging due to biological computation complexity.

Purpose of the Study:

  • To mathematically prove a fundamental biomolecular controller topology for integral feedback.
  • To genetically engineer and demonstrate a synthetic integral feedback controller in living cells.

Main Methods:

  • Mathematical modeling to identify a core controller topology.
  • Genetic engineering of a synthetic integral feedback controller.
  • Application in Escherichia coli for growth-rate control.

Main Results:

  • A single biomolecular controller topology was identified that realizes integral feedback.
  • The synthetic controller demonstrated robust perfect adaptation in living cells.
  • The controller showed tunability and robustness in a growth-rate regulation application.

Conclusions:

  • The study provides a conceptual and practical framework for engineering synthetic controllers in biological systems.
  • The synthetic integral controller offers a versatile tool for regulating biological variables in uncertain intracellular networks.
  • This work advances the field of cybergenetics by enabling precise control over living system dynamics.