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Developing reduced SNP assays from whole-genome sequence data to estimate introgression in an organism with complex genetic patterns, the Iberian honeybee (Apis mellifera iberiensis)
Univ Minho, Ctr Mol & Environm Biol CBMA, Braga, Portugal;Polytech Inst Braganca, Mt Res Ctr CIMO, Braganca, Portugal.
Agroscope, Swiss Bee Res Ctr, Bern, Switzerland;Univ Bern, Vetsuisse Fac, Inst Bee Hlth, Bern, Switzerland.
Univ Toulouse, GenPhySE, INRA, INPT,INP ENVT, Castanet Tolosan, France.
Univ Edinburgh, Roslin Inst, Edinburgh, Midlothian, Scotland.
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2018 (English)In: Evolutionary Applications, ISSN 1752-4571, E-ISSN 1752-4571, Vol. 11, no 8, p. 1270-1282Article in journal (Refereed) Published
Abstract [en]

The most important managed pollinator, the honeybee (Apis mellifera L.), has been subject to a growing number of threats. In western Europe, one such threat is large-scale introductions of commercial strains (C-lineage ancestry), which is leading to introgressive hybridization and even the local extinction of native honeybee populations (M-lineage ancestry). Here, we developed reduced assays of highly informative SNPs from 176 whole genomes to estimate C-lineage introgression in the most diverse and evolutionarily complex subspecies in Europe, the Iberian honeybee (Apis mellifera iberiensis). We started by evaluating the effects of sample size and sampling a geographically restricted area on the number of highly informative SNPs. We demonstrated that a bias in the number of fixed SNPs (F-ST=1) is introduced when the sample size is small (N10) and when sampling only captures a small fraction of a population's genetic diversity. These results underscore the importance of having a representative sample when developing reliable reduced SNP assays for organisms with complex genetic patterns. We used a training data set to design four independent SNP assays selected from pairwise F-ST between the Iberian and C-lineage honeybees. The designed assays, which were validated in holdout and simulated hybrid data sets, proved to be highly accurate and can be readily used for monitoring populations not only in the native range of A.m.iberiensis in Iberia but also in the introduced range in the Balearic islands, Macaronesia and South America, in a time- and cost-effective manner. While our approach used the Iberian honeybee as model system, it has a high value in a wide range of scenarios for the monitoring and conservation of potentially hybridized domestic and wildlife populations.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 11, no 8, p. 1270-1282
Keywords [en]
Apis mellifera iberiensis, fixation index, informative SNPs, reduced SNP assays
National Category
Evolutionary Biology Genetics
Identifiers
URN: urn:nbn:se:uu:diva-362481DOI: 10.1111/eva.12623ISI: 000442210300007PubMedID: 30151039OAI: oai:DiVA.org:uu-362481DiVA, id: diva2:1254892
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2018-10-10Bibliographically approved

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Wallberg, AndreasWebster, Matthew Thomas

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