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Regulatory circuit design and evolution using phage lambda.

Shota Atsumi1, John W Little

  • 1Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, Arizona 85721, USA.

Genes & Development
|September 3, 2004
PubMed
Summary
This summary is machine-generated.

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Researchers modified the phage lambda gene circuit to create new regulatory behaviors. This approach, using genetic selection, reveals how complex biological circuits can evolve from simpler components.

Area of Science:

  • Synthetic biology
  • Molecular biology
  • Systems biology

Background:

  • Bistable gene regulatory circuits exhibit multiple stable epigenetic states.
  • Designing novel circuits de novo is a common approach to study systems properties.
  • Natural gene circuits, like that of phage lambda, possess inherent complex behaviors.

Purpose of the Study:

  • To explore an alternative approach to circuit design by modifying an existing natural bistable circuit.
  • To investigate the evolution of gene regulatory circuit behavior through genetic selection.
  • To understand circuit design principles and systems behavior by altering the phage lambda circuit.

Main Methods:

  • Modification of the phage lambda bistable gene circuit by replacing the Cro repressor with a Lac repressor-operator module.

Related Experiment Videos

  • Utilizing powerful genetic selections to identify functional circuit variants with altered behaviors.
  • Employing a combinatorial approach to isolate and characterize diverse regulatory variants.

    • Main Results:

    • Isolated variants exhibited behaviors similar to wild-type phage lambda, including lytic growth, stable lysogeny, and prophage induction.
    • A novel variant demonstrated ligand-dependent bistability, forming stable lysogens in the presence of a Lac repressor ligand and switching to the lytic state upon ligand removal.
    • Several selected isolates evolved towards desired functionalities under specific selective pressures.

    Conclusions:

    • Modifying existing natural circuits offers advantages for understanding circuit design, systems behavior, and evolution.
    • Complex regulatory circuits can emerge through the evolutionary combination of simpler regulatory modules.
    • This study provides insights into the principles governing the evolution and design of biological circuits.