A novel insect-specific flavivirus replicates only in Aedes-derived cells and persists at high prevalence in wild Aedes vigilax populations in Sydney, Australia

Breeanna J. McLean, Jody Hobson-Peters, Cameron E. Webb, Daniel Watterson, Natalie A. Prow, Hong Duyen Nguyen, Sonja Hall-Mendelin, David Warrilow, Cheryl A. Johansen, Cassie C. Jansen, Andrew F van den Hurk, Nigel W Beebe, Esther Schnettler, Ross T. Barnard, Roy A Hall

Research output: Contribution to journalArticleResearchpeer-review

36 Citations (Scopus)

Abstract

To date, insect-specific flaviviruses (ISFs) have only been isolated from mosquitoes and increasing evidence suggests that ISFs may affect the transmission of pathogenic flaviviruses. To investigate the diversity and prevalence of ISFs in Australian mosquitoes, samples from various regions were screened for flaviviruses by ELISA and RT-PCR. Thirty-eight pools of Aedes vigilax from Sydney in 2007 yielded isolates of a novel flavivirus, named Parramatta River virus (PaRV). Sequencing of the viral RNA genome revealed it was closely related to Hanko virus with 62.3% nucleotide identity over the open reading frame. PaRV failed to grow in vertebrate cells, with only Aedes-derived mosquito cell lines permissive to replication, suggesting a narrow host range. 2014 collections revealed that PaRV had persisted in A. vigilax populations in Sydney, with 88% of pools positive. Further investigations into its mode of transmission and potential to influence vector competence of A. vigilax for pathogenic viruses are warranted.

Original languageEnglish
Pages (from-to)272-283
Number of pages12
JournalVirology
Volume486
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Keywords

  • Aedes vigilax
  • Arbovirus
  • Coquillettidia xanthogaster
  • Insect-specific flavivirus
  • Mosquito
  • Palm Creek virus
  • Parramatta River virus
  • Virus discovery

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