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Evolution of genetic switch complexity.

Gregory W Broussard1, Graham F Hatfull

  • 1Department of Biological Sciences; University of Pittsburgh; Pittsburgh, PA USA.

Bacteriophage
|July 3, 2013
PubMed
Summary
This summary is machine-generated.

The evolution of phage genetic switches likely progressed from simple, integration-dependent systems to complex ones like phage lambda. This study proposes a model for this evolutionary transition.

Keywords:
bistablegenetic circuitsgenetic switchintegration-dependent immunitylytic and lysogenic growth

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • The genetic switch of phage lambda, controlling lytic or lysogenic growth, is complex and its evolutionary origins are unclear.
  • A simpler class of genetic switches in mycobacteriophages, dependent on integration and comprising only three genes (integrase, repressor, cro), has been identified.
  • These simpler switches lack key components found in lambda-like circuitry, such as xis, cII, and cIII.

Purpose of the Study:

  • To propose a model for the evolution of complex phage lambda-like genetic switches.
  • To explore the evolutionary pathway from simpler, integration-dependent switches to more complex systems.

Main Methods:

  • Comparative analysis of genetic switch components in different prophages.
  • Modeling of evolutionary events leading to increased genetic switch complexity.

Main Results:

  • Identification of a distinct class of three-gene genetic switches in mycobacteriophages.
  • These switches exhibit integration-dependent immunity, differing significantly from lambda-like switches.
  • These findings suggest a potential evolutionary precursor to more complex genetic switches.

Conclusions:

  • Simpler, integration-dependent genetic switches represent an elegant mechanism for controlling phage infection outcomes.
  • A plausible evolutionary trajectory exists from these simpler switches to the complex circuitry of phage lambda.
  • Understanding these evolutionary pathways provides insights into the adaptation of phages to diverse hosts and environments.