title: Using genome-wide measures of coancestry to maintain diversity and fitness in endangered and domestic pig populations.
abstract: Conservation and breeding programs aim at maintaining the most diversity, thereby avoiding deleterious effects of inbreeding while maintaining enough variation from which traits of interest can be selected. Theoretically, the most diversity is maintained using optimal contributions based on many markers to calculate coancestries, but this can decrease fitness by maintaining linked deleterious variants. The heterogeneous patterns of coancestry displayed in pigs make them an excellent model to test these predictions. We propose methods to measure coancestry and fitness from resequencing data and use them in population management. We analyzed the resequencing data of Sus cebifrons, a highly endangered porcine species from the Philippines, and genotype data from the Pietrain domestic breed. By analyzing the demographic history of Sus cebifrons, we inferred two past bottlenecks that resulted in some inbreeding load. In Pietrain, we analyzed signatures of selection possibly associated with commercial traits. We also simulated the management of each population to assess the performance of different optimal contribution methods to maintain diversity, fitness, and selection signatures. Maximum genetic diversity was maintained using marker-by-marker coancestry, and least using genealogical coancestry. Using a measure of coancestry based on shared segments of the genome achieved the best results in terms of diversity and fitness. However, this segment-based management eliminated signatures of selection. We demonstrate that maintaining both diversity and fitness depends on the genomic distribution of deleterious variants, which is shaped by demographic and selection histories. Our findings show the importance of genomic and next-generation sequencing information in the optimal design of breeding or conservation programs.
authors.affiliation: ABGC Wageningen University, 6700 Wageningen, The Netherlands;
authors.forename: Mirte
authors.initials: M
authors.lastname: Bosse
authors.affiliation: ABGC Wageningen University, 6700 Wageningen, The Netherlands;
authors.forename: Hendrik-Jan
authors.initials: HJ
authors.lastname: Megens
authors.affiliation: ABGC Wageningen University, 6700 Wageningen, The Netherlands;
authors.forename: Ole
authors.initials: O
authors.lastname: Madsen
authors.affiliation: ABGC Wageningen University, 6700 Wageningen, The Netherlands;
authors.forename: Richard P M A
authors.initials: RP
authors.lastname: Crooijmans
authors.affiliation: San Diego Zoo Institute for Conservation Research, Escondido, California 92027, USA;
authors.forename: Oliver A
authors.initials: OA
authors.lastname: Ryder
authors.affiliation: Muséum national d'histoire naturelle (MNHN), 75005 Paris, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Austerlitz
authors.affiliation: ABGC Wageningen University, 6700 Wageningen, The Netherlands;
authors.forename: Martien A M
authors.initials: MA
authors.lastname: Groenen
authors.affiliation: Muséum national d'histoire naturelle (MNHN), 75005 Paris, France.
authors.forename: M Angeles R
authors.initials: MA
authors.lastname: de Cara
mesh_terms: D000818:Animals; D056727:Endangered Species; D056084:Genetic Fitness; D014644:Genetic Variation; D005828:Genetics, Population; D016678:Genome; D023281:Genomics / Q000379:methods; D012641:Selection, Genetic; D034421:Sus scrofa / Q000235:genetics*; D013552:Swine