TY - JOUR

T1 - Rapid and Predictable Evolution of Admixed Populations Between Two Drosophila Species Pairs

AU - Matute, Daniel R.

AU - Comeault, Aaron

AU - Earley, Eric

AU - Serrato-Capuchina, Antonio

AU - Peede, David

AU - Monroy-Eklund, Anaïs

AU - Huang, Wen

AU - Jones, Corbin D.

AU - Mackay, Trudy F.C.

AU - Coyne, Jerry A.

N1 - Copyright © 2020 by the Genetics Society of America.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Abstract In this article, Matute et al. report an experiment in which they generated eight interspecific admixed populations using two species pairs of Drosophila. They found that in both species pairs, and across all experimental replicates... The consequences of hybridization are varied, ranging from the origin of new lineages, introgression of some genes between species, to the extinction of one of the hybridizing species. We generated replicate admixed populations between two pairs of sister species of Drosophila: D. simulans and D. mauritiana; and D. yakuba and D. santomea. Each pair consisted of a continental species and an island endemic. The admixed populations were maintained by random mating in discrete generations for over 20 generations. We assessed morphological, behavioral, and fitness-related traits from each replicate population periodically, and sequenced genomic DNA from the populations at generation 20. For both pairs of species, species-specific traits and their genomes regressed to those of the continental species. A few alleles from the island species persisted, but they tended to be proportionally rare among all sites in the genome and were rarely fixed within the populations. This paucity of alleles from the island species was particularly pronounced on the X-chromosome. These results indicate that nearly all foreign genes were quickly eliminated after hybridization and that selection against the minor species genome might be similar across experimental replicates.

AB - Abstract In this article, Matute et al. report an experiment in which they generated eight interspecific admixed populations using two species pairs of Drosophila. They found that in both species pairs, and across all experimental replicates... The consequences of hybridization are varied, ranging from the origin of new lineages, introgression of some genes between species, to the extinction of one of the hybridizing species. We generated replicate admixed populations between two pairs of sister species of Drosophila: D. simulans and D. mauritiana; and D. yakuba and D. santomea. Each pair consisted of a continental species and an island endemic. The admixed populations were maintained by random mating in discrete generations for over 20 generations. We assessed morphological, behavioral, and fitness-related traits from each replicate population periodically, and sequenced genomic DNA from the populations at generation 20. For both pairs of species, species-specific traits and their genomes regressed to those of the continental species. A few alleles from the island species persisted, but they tended to be proportionally rare among all sites in the genome and were rarely fixed within the populations. This paucity of alleles from the island species was particularly pronounced on the X-chromosome. These results indicate that nearly all foreign genes were quickly eliminated after hybridization and that selection against the minor species genome might be similar across experimental replicates.

KW - Animals

KW - Biological Evolution

KW - Chromosome Mapping

KW - Drosophila/classification

KW - Genetic Speciation

KW - Genetic Variation

KW - Genetics, Population

KW - Genome

KW - Hybridization, Genetic

KW - Reproduction

KW - Sexual Behavior, Animal

U2 - 10.1534/genetics.119.302685

DO - 10.1534/genetics.119.302685

M3 - Article

C2 - 31767631

VL - 214

SP - 211

EP - 230

JO - Genetics

JF - Genetics

SN - 0016-6731

IS - 1

ER -