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Mosquito-capsid interactions contribute to flavivirus vector specificity.

Jichen Niu1, Jun Ma2, Yibin Zhu1,3

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Nature
|February 4, 2026
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Summary
This summary is machine-generated.

Mosquitoes transmit flaviviruses using extracellular vesicles, not free virions. Mosquito valosin-containing protein (VCP) binding to viral capsid determines vector specificity, explaining flavivirus transmission differences.

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Area of Science:

  • Virology
  • Entomology
  • Molecular Biology

Background:

  • Mosquitoes transmit numerous flaviviruses, but factors governing vector competence and interspecies specificity remain unclear.
  • Understanding these factors is crucial for controlling flavivirus transmission, such as dengue virus (DENV) by Aedes aegypti.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying flavivirus dissemination in mosquitoes.
  • To identify the genetic basis for mosquito species-specific flavivirus infectivity.

Main Methods:

  • Investigated flavivirus infectivity in mosquito hemolymph.
  • Utilized valosin-containing protein (VCP) binding assays and viral capsid manipulation.
  • Performed in vivo ectopic expression studies in mosquito vectors.

Main Results:

  • Extracellular vesicles, not free virions, mediate flavivirus intercellular dissemination due to hemolymph acidity.
  • Mosquito VCP binds to flavivirus capsid, with specificity determined by two amino acid residues (e.g., D723/N728 in Aedes, E723/E728 in Culex).
  • Altering VCP binding specificity experimentally altered mosquito susceptibility to flaviviruses.

Conclusions:

  • Mosquito VCP-viral capsid interaction is a key molecular mechanism determining flavivirus vector specificity.
  • This interaction enables systemic virus dissemination within the mosquito hemocoel.
  • Further research is needed to understand specificity mechanisms at the midgut level.