Combining Two-Stage Testing and Interval Mapping Strategies to Detect QTL for Resistance to Bonamiosis in the European Flat Oyster Ostrea edulis |
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Authors: | D Lallias L Gomez-Raya C S Haley I Arzul S Heurtebise A R Beaumont P Boudry S Lapègue |
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Institution: | 1. Laboratoire Génétique et Pathologie, Ifremer, Ronce-les-bains, 17390, La Tremblade, France 2. School of Ocean Sciences, College of Natural Sciences, Bangor University, Askew Street, Menai Bridge, Anglesey, LL59 5AB, UK 3. Department of Animal Biotechnology, University of Nevada, Reno, NV, 89557, USA 4. Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin BioCentre, Midlothian, EH25 9PS, UK 5. MRC Human Genetics Unit, Western General Hospital, Edinburgh, EH4 2XU, UK 6. UMR M100 Physiologie et Ecophysiologie des Mollusques Marins, Ifremer, Plouzané, France
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Abstract: | We have identified quantitative trait loci (QTL) in the flat oyster (Ostrea edulis) for resistance to Bonamia ostreae, a parasite responsible for the dramatic reduction in the aquaculture of this species. An F2 family from a cross between a wild oyster and an individual from a family selected for resistance to bonamiosis was cultured
with wild oysters injected with the parasite, leading to 20% cumulative mortality. Selective genotyping of 92 out of a total
of 550 F2 progeny (i.e., 46 heavily infected oysters that died and 46 parasite-free oysters that survived) was performed using 20 microsatellites
and 34 amplification fragment length polymorphism primer pairs. Both a two-stage testing strategy and QTL interval mapping
methods were used. The two-stage detection strategy had a high power with a low rate of false positives and identified nine
and six probable markers linked to genes of resistance and susceptibility, respectively. Parent-specific genetic linkage maps
were built for the family, spanning ten linkage groups (n = 10) with an observed genome coverage of 69–84%. Three QTL were identified by interval mapping in the first parental map
and two in the second. Good concordance was observed between the results obtained after the two-stage testing strategy and
QTL mapping. |
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Keywords: | Ostrea edulis Disease resistance QTL mapping Survival analysis Statistical power |
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