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Characterization of a Novel Orthomyxo-like Virus Causing Mass Die-Offs of Tilapia

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  • Eran Bacharach
  • Nischay Mishra
  • Thomas Briese
  • Michael C Zody
  • Japhette Esther Kembou Tsofack
  • Rachel Zamostiano
  • Asaf Berkowitz
  • James Ng
  • Adam Nitido
  • André Corvelo
  • Nora C Toussaint
  • Sandra Cathrine Abel Nielsen
  • Mady Hornig
  • Jorge Del Pozo
  • Toby Bloom
  • Hugh Ferguson
  • Avi Eldar
  • W Ian Lipkin

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    Rights statement: © 2016 Bacharach et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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    Licence: Creative Commons: Attribution (CC-BY)

Original languageEnglish
Article numbere00431-16
JournalmBio
Volume7
Issue number2
DOIs
StatePublished - 5 Apr 2016

Abstract

UNLABELLED: Tilapia are an important global food source due to their omnivorous diet, tolerance for high-density aquaculture, and relative disease resistance. Since 2009, tilapia aquaculture has been threatened by mass die-offs in farmed fish in Israel and Ecuador. Here we report evidence implicating a novel orthomyxo-like virus in these outbreaks. The tilapia lake virus (TiLV) has a 10-segment, negative-sense RNA genome. The largest segment, segment 1, contains an open reading frame with weak sequence homology to the influenza C virus PB1 subunit. The other nine segments showed no homology to other viruses but have conserved, complementary sequences at their 5' and 3' termini, consistent with the genome organization found in other orthomyxoviruses.In situhybridization indicates TiLV replication and transcription at sites of pathology in the liver and central nervous system of tilapia with disease.

IMPORTANCE: The economic impact of worldwide trade in tilapia is estimated at $7.5 billion U.S. dollars (USD) annually. The infectious agent implicated in mass tilapia die-offs in two continents poses a threat to the global tilapia industry, which not only provides inexpensive dietary protein but also is a major employer in the developing world. Here we report characterization of the causative agent as a novel orthomyxo-like virus, tilapia lake virus (TiLV). We also describe complete genomic and protein sequences that will facilitate TiLV detection and containment and enable vaccine development.

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