Widespread Introgression Across a Phylogeny of 155 Drosophila Genomes

Document Type

Article

Publication Date

1-10-2022

Publication Title

Current Biology

Volume

32

Issue

1

First page number:

111

Last page number:

123.e1–e5

Abstract

Genome-scale sequence data have invigorated the study of hybridization and introgression, particularly in animals. However, outside of a few notable cases, we lack systematic tests for introgression at a larger phylogenetic scale across entire clades. Here, we leverage 155 genome assemblies from 149 species to generate a fossil-calibrated phylogeny and conduct multilocus tests for introgression across 9 monophyletic radiations within the genus Drosophila. Using complementary phylogenomic approaches, we identify widespread introgression across the evolutionary history of Drosophila. Mapping gene-tree discordance onto the phylogeny revealed that both ancient and recent introgression has occurred across most of the 9 clades that we examined. Our results provide the first evidence of introgression occurring across the evolutionary history of Drosophila and highlight the need to continue to study the evolutionary consequences of hybridization and introgression in this genus and across the tree of life.

Keywords

Gene flow; Introgression; Phylogenetic discordance; Phylogenomics; Reticulate evolution

Disciplines

Biology and Biomimetic Materials | Life Sciences

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