Strong artificial selection in domestic mammals did not result in an increased recombination rate
| Autor: | Esperanza Manzano-Piedras, Ignasi Roig, Jane M. Morrell, Adrian Villalba, Anna Di Rienzo, Marina Marcet-Ortega, Carles Vilà, Violeta Muñoz-Fuentes, Attila Tóth, Katrin Daniel, Arne Söderberg, Catharina Linde Forsberg, Gorka Alkorta-Aranburu |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Male
Locus (genetics) Ovis Immunolocalization Dogs Spermatocytes Genetics Animals Ectopic recombination Domestication Molecular Biology Discoveries Ecology Evolution Behavior and Systematics Canidae Mammals Recombination Genetic Sheep biology Directional selection Goats MLH1 Genetic Variation Genomics biology.organism_classification Mouflon Capra Female Canis Recombination |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Recombination rates vary in intensity and location at the species, individual, sex and chromosome levels. Despite the fundamental biological importance of this process, the selective forces that operate to shape recombination rate and patterns are unclear. Domestication offers a unique opportunity to study the interplay between recombination and selection, particularly due to Hill-Robertson interference, which should be important when many linked loci are repeatedly the target of selection. In domesticates, intense selection for particular traits is imposed on small populations over many generations, resulting in organisms that differ, sometimes dramatically, in morphology and physiology from their wild ancestor. Although earlier studies suggested increased recombination rate in domesticates, a formal comparison of recombination rates between domestic mammals and their wild congeners was missing. In order to determine broad-scale recombination rate, we used immunolabeling detection of MLH1 foci as crossover markers in spermatocytes in three pairs of closely related wild and domestic species (dog and wolf, goat and ibex, sheep and mouflon). In the three pairs, and contrary to previous suggestions, our data show that contemporary recombination rate is higher in the wild species. Subsequently, we inferred recombination breakpoints in sequence data for 16 genomic regions in dogs and wolves, each containing a locus associated with a dog phenotype potentially under selection during domestication. No difference in the number and distribution of recombination breakpoints was found between dogs and wolves. We conclude that our data indicate that strong directional selection did not result in changes in recombination in domestic mammals, and that both upper and lower bounds for crossover rates may be tightly regulated |
| Databáze: | OpenAIRE |
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