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Related Experiment Video

Updated: Sep 19, 2025

Rescue and Characterization of Recombinant Virus from a New World Zika Virus Infectious Clone
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Reverse genetics rescue of sylvatic dengue viruses.

Paul Gendler1,2, Arturo Barbachano-Guerrero2, Samuel D Chappell2

  • 1Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, Colorado, USA.

Journal of Virology
|June 4, 2025
PubMed
Summary

Researchers optimized a reverse genetics method to rescue sylvatic dengue viruses, enabling the study of forest-dwelling dengue virus strains and their potential for human adaptation. This advance provides crucial tools for understanding emerging infectious disease threats.

Keywords:
dengue virusreverse genetics

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Last Updated: Sep 19, 2025

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Area of Science:

  • Virology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Sylvatic dengue viruses, circulating in nonhuman primates and mosquitoes in Africa and Asia, occasionally infect humans, posing a potential threat for new epidemics.
  • A significant barrier to studying these viruses is the limited availability of infectious stocks, despite numerous genome sequences in public databases.
  • Existing reverse genetics methods for dengue virus manipulation are challenging, particularly for sylvatic strains.

Purpose of the Study:

  • To optimize a reverse genetics technique for the efficient rescue of infectious sylvatic dengue virus stocks from sequence data.
  • To generate a collection of rescued sylvatic dengue virus strains for further biological characterization.
  • To assess the replication fitness of different sylvatic dengue virus strains in various cell types, including human, monkey, and mosquito cells.

Main Methods:

  • Development and optimization of a novel reverse genetics approach tailored for sylvatic dengue viruses.
  • Utilizing mosquito cells, rather than mammalian cells, as the critical cell type for initiating sylvatic dengue virus replication from assembled genomes.
  • Rescue of seven distinct sylvatic dengue virus strains using the optimized method.

Main Results:

  • Successful rescue of seven sylvatic dengue virus strains, creating a valuable resource for research.
  • Demonstration that mosquito cells are universally permissive for sylvatic dengue virus replication.
  • Identification of specific sylvatic dengue virus strains exhibiting significantly enhanced replication in human and monkey cells compared to others.

Conclusions:

  • The optimized reverse genetics method enables the transformation of any available sylvatic dengue virus sequence into infectious virus stocks.
  • Certain sylvatic dengue virus strains show a higher replication potential in mammalian cells, suggesting a greater capacity for human adaptation.
  • This work provides essential tools and insights for monitoring and understanding the potential emergence of novel dengue virus threats to human populations.