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First evaluation of resistance to both a California OsHV-1 variant and a French OsHV-1 microvariant in Pacific oysters

  • Divilov, Konstantin1
  • Schoolfield, Blaine1
  • Morga, Benjamin2
  • Dégremont, Lionel2
  • Burge, Colleen A.3
  • Mancilla Cortez, Daniel4
  • Friedman, Carolyn S.5
  • Fleener, Gary B.4
  • Dumbauld, Brett R.6
  • Langdon, Chris1
  • 1 Oregon State University, Hatfield Marine Science Center, Newport, Oregon, USA , Newport (United States)
  • 2 Laboratoire de Génétique et Pathologie des Mollusques Marins, Ifremer, La Tremblade, France , La Tremblade (France)
  • 3 University of Maryland Baltimore County, Baltimore, Maryland, USA , Baltimore (United States)
  • 4 Hog Island Oyster Co., Marshall, California, USA , California (United States)
  • 5 University of Washington, Seattle, Washington, USA , Washington (United States)
  • 6 Hatfield Marine Science Center, Newport, Oregon, USA , Newport (United States)
Published Article
BMC Genetics
Springer (Biomed Central Ltd.)
Publication Date
Dec 12, 2019
DOI: 10.1186/s12863-019-0791-3
Springer Nature


BackgroundVariants of the Ostreid herpesvirus 1 (OsHV-1) cause high losses of Pacific oysters globally, including in Tomales Bay, California, USA. A suite of new variants, the OsHV-1 microvariants (μvars), cause very high mortalities of Pacific oysters in major oyster-growing regions outside of the United States. There are currently no known Pacific oysters in the United States that are resistant to OsHV-1 as resistance has yet to be evaluated in these oysters. As part of an effort to begin genetic selection for resistance to OsHV-1, 71 families from the Molluscan Broodstock Program, a US West Coast Pacific oyster breeding program, were screened for survival after exposure to OsHV-1 in Tomales Bay. They were also tested in a quarantine laboratory in France where they were exposed to a French OsHV-1 microvariant using a plate assay, with survival recorded from three to seven days post-infection.ResultsSignificant heritability for survival were found for all time points in the plate assay and in the survival phenotype from a single mortality count in Tomales Bay. Genetic correlations between survival against the French OsHV-1 μvar in the plate assay and the Tomales Bay variant in the field trait were weak or non-significant.ConclusionsFuture breeding efforts will seek to validate the potential of genetic improvement for survival to OsHV-1 through selection using the Molluscan Broodstock Program oysters. The lack of a strong correlation in survival between OsHV-1 variants under this study’s exposure conditions may require independent selection pressure for survival to each variant in order to make simultaneous genetic gains in resistance.

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