title: Background Selection in Partially Selfing Populations.
abstract: Self-fertilizing species often present lower levels of neutral polymorphism than their outcrossing relatives. Indeed, selfing automatically increases the rate of coalescence per generation, but also enhances the effects of background selection and genetic hitchhiking by reducing the efficiency of recombination. Approximations for the effect of background selection in partially selfing populations have been derived previously, assuming tight linkage between deleterious alleles and neutral loci. However, loosely linked deleterious mutations may have important effects on neutral diversity in highly selfing populations. In this article, I use a general method based on multilocus population genetics theory to express the effect of a deleterious allele on diversity at a linked neutral locus in terms of moments of genetic associations between loci. Expressions for these genetic moments at equilibrium are then computed for arbitrary rates of selfing and recombination. An extrapolation of the results to the case where deleterious alleles segregate at multiple loci is checked using individual-based simulations. At high selfing rates, the tight linkage approximation underestimates the effect of background selection in genomes with moderate to high map length; however, another simple approximation can be obtained for this situation and provides accurate predictions as long as the deleterious mutation rate is not too high.
authors.affiliation: Centre National de la Recherche Scientifique, Unité Mixte Internationale 3614, Evolutionary Biology and Ecology of Algae, Roscoff, FranceSorbonne Universités, Université Pierre et Marie Curie Université Paris VI, 29688 Roscoff, France roze@sb-roscoff.fr.
authors.forename: Denis
authors.initials: D
authors.lastname: Roze
mesh_terms: D000818:Animals; D056426:Genetic Loci; D008957:Models, Genetic; D009154:Mutation; D010944:Plants / Q000235:genetics; D012641:Selection, Genetic; D057945:Self-Fertilization / Q000235:genetics*
keywords: deleterious mutation; effective population size; genetic drift; multilocus population genetics; self-fertilization