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Related Experiment Videos

Mutator dynamics in fluctuating environments.

J M J Travis1, E R Travis

  • 1Institute of Mathematics, University of St Andrews, St Andrews, Fife KY16 9SS, UK. justin@mcs.st-and.ac.uk

Proceedings. Biological Sciences
|March 28, 2002
PubMed
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Mutator clones, populations with high mutation rates, are key to adaptation in changing environments. Their prevalence depends on environmental fluctuation speed, with intermediate rates favoring mutators.

Area of Science:

  • Evolutionary biology
  • Genetics
  • Population dynamics

Background:

  • Mutator clones, organisms with high mutation rates, are increasingly linked to drug resistance.
  • Despite most mutations being deleterious, mutator clones play a role in adaptation to changing environments.

Purpose of the Study:

  • To investigate mutator clone dynamics under regularly fluctuating environmental conditions.
  • To model how environmental change frequency impacts mutator prevalence and behavior.

Main Methods:

  • Mathematical modeling of population dynamics.
  • Simulation of regularly varying environments to mimic drug or pesticide resistance scenarios.

Main Results:

  • Mutators are most prevalent at intermediate rates of environmental change; rapid changes favor generalists.

Related Experiment Videos

  • Mutator dynamics can exhibit complex behaviors like limit cycles and chaos.
  • Higher fitness gains from beneficial mutations increase mutator density in fluctuating environments.
  • Intermediate strength mutators achieve higher densities than weak or strong mutators.

    • Conclusions:

    • Environmental fluctuation rate is a critical factor shaping mutator prevalence and dynamics.
    • Mutator strength and the fitness benefit of mutations influence their ecological success.
    • Understanding mutator dynamics is crucial for predicting adaptation and resistance in variable environments.