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Related Experiment Video

Updated: May 2, 2026

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Architecture-dependent noise discriminates functionally analogous differentiation circuits.

Tolga Cağatay1, Marc Turcotte, Michael B Elowitz

  • 1Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Cell
|October 27, 2009
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Summary
This summary is machine-generated.

Different gene circuit designs can achieve similar outcomes, but architectural variations impact cellular noise. This study reveals a tradeoff between temporal precision and response range, controlled by noise characteristics in gene regulatory networks.

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Area of Science:

  • Systems biology
  • Synthetic biology
  • Microbiology

Background:

  • Gene regulatory circuits can exhibit similar dynamic behaviors despite differing architectures.
  • Understanding the selection principles for specific circuit architectures in cellular processes is crucial.

Purpose of the Study:

  • To investigate why a particular gene circuit architecture is chosen for a cellular process.
  • To compare the native Bacillus subtilis competence regulatory circuit with an engineered alternative (SynEx).

Main Methods:

  • In silico and in vivo comparative analysis of native and engineered gene circuits.
  • Time-lapse microscopy to measure cellular dynamics and differentiation.
  • Assessment of stochastic fluctuations (noise) and their impact on circuit function.

Main Results:

  • The engineered SynEx circuit replicated the competence dynamics and differentiation physiology of the native Bacillus subtilis circuit.
  • Architectural differences between the circuits led to distinct patterns of stochastic fluctuations (noise).
  • Noise characteristics selectively influenced the timing of competence and the system's response to DNA concentration.

Conclusions:

  • Distinct noise profiles arising from alternative circuit architectures create functional differences.
  • A tradeoff exists between temporal precision and the range of physiological responses, governed by noise characteristics.
  • This highlights the importance of noise in shaping the functional output of gene regulatory circuits.