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Compositional memory matters for early molecular systems.

Barnabe Ledoux1, Ryoka Kuwabara2, Norikazu Ichihashi3,4,5

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Summary
This summary is machine-generated.

Transient compartmentalization prevents molecular errors during the origin of life. Partial compartmentalization allows compositional memory, crucial for the coevolution of replicators and parasites in early molecular systems.

Keywords:
coevolutioncompartmentscompositional memoryorigin of lifeparasites

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Area of Science:

  • Origin of Life research
  • Systems chemistry
  • Molecular evolution

Background:

  • The error catastrophe, characterized by nonfunctional molecule proliferation, may have occurred during the origin of life due to low-accuracy molecular replication.
  • Transient compartmentalization can prevent error catastrophe if compartments are sealed.
  • Existing models often assume complete pooling, losing compositional memory, and neglect the coevolutionary impact of compartmentalization.

Purpose of the Study:

  • To develop a framework for studying the coevolution of molecular replicators and parasites under partial, transient compartmentalization.
  • To investigate how compositional memory influences early molecular systems.
  • To analyze the effects of stirring-induced mixing on compartmentalized replicator dynamics.

Main Methods:

  • Developed a novel theoretical framework incorporating coevolution and partial transient compartmentalization.
  • Benchmarked the model using serial dilution experiments with four RNA replicators.
  • Quantified mixing levels in compartments under varying stirring conditions.
  • Modeled the impact of stirring-induced mixing on replicator dynamics.

Main Results:

  • The model demonstrated complex oscillatory dynamics in RNA replicator systems.
  • Partial compartmentalization allows for the accumulation of compositional memory.
  • Stirring significantly alters the dynamics of compartmentalized replicators by influencing mixing.
  • Coevolutionary dynamics are sensitive to the degree of compartmentalization and mixing.

Conclusions:

  • Compositional memory, facilitated by transient partial compartmentalization, is a key factor in the dynamics of early molecular systems.
  • Partial compartmentalization is essential for maintaining molecular information and enabling coevolution.
  • Understanding mixing dynamics is critical for accurately modeling early life scenarios.