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Spatial structure undermines parasite suppression by gene drive cargo.

James J Bull1, Christopher H Remien2, Richard Gomulkiewicz3

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Gene drives can combat vector-borne diseases by reducing vector populations or blocking disease transmission. However, spatial structure in vector populations can accelerate disease agent resistance to gene drives.

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Area of Science:

  • Genetics
  • Ecology
  • Epidemiology

Background:

  • Gene drives offer novel strategies for controlling vector-borne diseases.
  • Two primary approaches involve population reduction or direct disease suppression.
  • Both strategies rely on the engineered drive spreading through the vector population.

Purpose of the Study:

  • To investigate the impact of spatial structure on the efficacy of gene drives for disease control.
  • To assess the potential for disease agent resistance evolution in spatially structured vector populations.
  • To explore strategies for mitigating spatial effects on gene drive effectiveness.

Main Methods:

  • Utilized simple mathematical models to simulate gene drive dynamics.
  • Incorporated spatial structure into population models.
  • Analyzed the evolution of resistance in the disease agent.

Main Results:

  • Spatial structure in vector populations significantly facilitates the persistence and evolution of disease agent resistance.
  • Disease agents can evolve resistance to gene drive cargo more readily in structured populations.
  • Some spatial structures may be intrinsic and difficult to overcome.

Conclusions:

  • Spatial structure poses a significant challenge to gene drive strategies for disease eradication.
  • Careful consideration of population spatial dynamics is crucial for designing effective gene drives.
  • Further research is needed to develop methods to counteract spatial effects and ensure successful disease control.