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Coevolution of compositional protocells and their environment.

Barak Shenhav1, Aia Oz, Doron Lancet

  • 1Department of Molecular Genetics and Crown Human Genome Centre, The Weizmann Institute of Science, Rehovot 76100, Israel. barak.shenhav@weizmann.ac.il

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 19, 2007
PubMed
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This study introduces the Environment Exchange Polymer GARD (EE-GARD) model, suggesting protocells and their environment coevolved before life began. Simulations show environmental feedback shapes protocell composition over time.

Area of Science:

  • Origin of Life Studies
  • Theoretical Chemistry
  • Systems Biology

Background:

  • The coevolution of life and environment is a known phenomenon.
  • This study explores pre-biotic coevolution between protocells and their surroundings.
  • Chemical exchanges between protocells and the environment are hypothesized to be crucial.

Purpose of the Study:

  • To propose and model a coevolutionary process between protocells and their environment before the origin of life.
  • To investigate how environmental composition influences protocell chemistry and vice versa.
  • To introduce the Environment Exchange Polymer GARD (EE-GARD) model.

Main Methods:

  • Extension of the Graded Autocatalysis Replication Domain (GARD) model to include environmental exchange.

Related Experiment Videos

  • Development of the EE-GARD model where molecules can be exported from protocells.
  • Computer simulations of EE-GARD with both infinite and finite environments.

    • Main Results:

    • In infinite environments, EE-GARD assemblies exhibited stable, time-independent compositions (composomes).
    • In finite environments, composome frequencies changed over time, with some disappearing and others emerging.
    • Changes in composome frequencies correlated with environmental alterations induced by the protocell assemblies.

    Conclusions:

    • The EE-GARD model demonstrates how protocells and their environment could coevolve.
    • Environmental feedback is critical for the dynamic evolution of protocell compositions.
    • This model provides a framework for understanding the temporal dynamics of early chemical systems.