title: Genetic hitchhiking associated with life history divergence and colonization of North America in the European corn borer moth.
abstract: A primary goal for evolutionary biology is to reveal the genetic basis for adaptive evolution and reproductive isolation. Using Z and E pheromone strains the European corn borer (ECB) moth, I address this problem through multilocus analyses of DNA polymorphism. I find that the locus Triose phosphate isomerase (Tpi) is a statistically significant outlier in coalescent simulations of demographic histories of population divergence, including strict allopatric isolation, restricted migration, secondary contact, and population growth or decline. This result corroborates a previous QTL study that identified the Tpi chromosomal region as a repository for gene(s) contributing to divergence in life history. Patterns of nucleotide polymorphism at Tpi suggest a recent selective sweep and genetic hitchhiking associated with colonization of North America from Europe ~200 generations ago. These results indicate that gene genealogies initially diverge during speciation because of selective sweeps, but differential introgression may play a role in the maintenance of differentiation for sympatric populations.
authors.affiliation: Department of Biology, Tufts University, 165 Packard Avenue, Medford, MA 02155, USA. erik.dopman@tufts.edu
authors.forename: Erik B
authors.initials: EB
authors.lastname: Dopman
mesh_terms: D000818:Animals; D005060:Europe; D051456:Gene Flow; D017344:Genes, Insect; D014644:Genetic Variation; D009036:Moths / Q000235:genetics* / Q000472:pathogenicity*; D009656:North America; D010802:Phylogeny; D011110:Polymorphism, Genetic; D040641:Quantitative Trait Loci; D014305:Triose-Phosphate Isomerase / Q000235:genetics; D003313:Zea mays / Q000469:parasitology*
chemical_list: D014305:Triose-Phosphate Isomerase