Drivers of linkage disequilibrium across a species’ geographic range


Autoři: Kay Lucek aff001;  Yvonne Willi aff001
Působiště autorů: Department of Environmental Sciences, University of Basel, Basel, Switzerland aff001
Vyšlo v časopise: Drivers of linkage disequilibrium across a species’ geographic range. PLoS Genet 17(3): e1009477. doi:10.1371/journal.pgen.1009477
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1009477

Souhrn

While linkage disequilibrium (LD) is an important parameter in genetics and evolutionary biology, the drivers of LD remain elusive. Using whole-genome sequences from across a species’ range, we assessed the impact of demographic history and mating system on LD. Both range expansion and a shift from outcrossing to selfing in North American Arabidopsis lyrata were associated with increased average genome-wide LD. Our results indicate that range expansion increases short-distance LD at the farthest range edges by about the same amount as a shift to selfing. However, the extent over which LD in genic regions unfolds was shorter for range expansion compared to selfing. Linkage among putatively neutral variants and between neutral and deleterious variants increased to a similar degree with range expansion, providing support that genome-wide LD was positively associated with mutational load. As a consequence, LD combined with mutational load may decelerate range expansions and set range limits. Finally, a small number of genes were identified as LD outliers, suggesting that they experience selection by either of the two demographic processes. These included genes involved in flowering and photoperiod for range expansion, and the self-incompatibility locus for mating system.

Klíčová slova:

Arabidopsis thaliana – Genetic drift – Genetic loci – Genomics – Linkage disequilibrium – Plant genomics – Population genetics – Single nucleotide polymorphisms


Zdroje

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