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Increase in error threshold for quasispecies by heterogeneous replication accuracy.

Kazuhiro Aoki1, Mitsuru Furusawa

  • 1White-Bird Institute, 1-14-9 Hanabatake, Tsukuba, Ibaraki 300-3261, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Heterogeneous replication accuracy in quasispecies can significantly increase the error threshold, preserving genetic information. This finding suggests a reduced genetic cost for selective evolution, even with diverse mutants.

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Area of Science:

  • Evolutionary dynamics
  • Molecular evolution
  • Genetics

Background:

  • Quasispecies theory describes the dynamics of mutant ensembles under mutation and selection.
  • Replication accuracy is a critical factor influencing genetic information stability.
  • Understanding error thresholds is vital for comprehending evolutionary processes.

Purpose of the Study:

  • To investigate the impact of heterogeneous replication accuracy on the error threshold in quasispecies.
  • To determine how polymerase error rates and the number of replicores affect genetic information stability.
  • To explore the implications for the genetic cost of selective evolution.

Main Methods:

  • Theoretical modeling of quasispecies dynamics.
  • Analysis of error-free and error-prone polymerase coexistence.
  • Simulation of systems with varying numbers of replicores.

Main Results:

  • Coexistence of error-free and error-prone polymerases substantially elevates the error threshold.
  • Increased error threshold prevents catastrophic loss of genetic information.
  • The number of replicores influences the overall error threshold.

Conclusions:

  • Heterogeneous replication accuracy offers a mechanism to maintain genetic information in evolving populations.
  • This mechanism can reduce the genetic cost associated with selective evolution.
  • Diverse mutant generation is sustained despite enhanced error threshold.