Complex evolutionary history with extensive ancestral gene flow in an African primate radiation

Jensen, Axel; Swift, Frances; de Vries, Dorien; Beck, Robin; Kuderna, Lukas F K; Knauf, Sascha; Chuma, Idrissa S; Keyyu, Julius D; Kitchener, Andrew C; Farh, Kyle; Rogers, Jeffrey; Marques-Bonet, Tomas; Detwiler, Kate M; Roos, Christian; Guschanski, Katerina

Abstract

Understanding the drivers of speciation is fundamental in evolutionary biology, and recent studies highlight hybridization as an important evolutionary force. Using whole-genome sequencing data from 22 species of guenons (tribe Cercopithecini), one of the world’s largest primate radiations, we show that rampant gene flow characterizes their evolutionary history, and identify ancient hybridization across deeply divergent lineages that differ in ecology, morphology and karyotypes. Some hybridization events resulted in mitochondrial introgression between distant lineages, likely facilitated by co-introgression of co-adapted nuclear variants. Although the genomic landscapes of introgression were largely lineage specific, we found that genes with immune functions were overrepresented in introgressing regions, in line with adaptive introgression, whereas genes involved in pigmentation and morphology may contribute to reproductive isolation. In line with reports from other systems that hybridization might facilitate diversification, we find that some of the most species-rich guenon clades are of admixed origin. This study provides important insights into the prevalence, role and outcomes of ancestral hybridization in a large mammalian radiation.

Citation

Jensen, A., Swift, F., de Vries, D., Beck, R., Kuderna, L. F. K., Knauf, S., …Guschanski, K. (in press). Complex evolutionary history with extensive ancestral gene flow in an African primate radiation. Molecular Biology and Evolution, 40(12), https://doi.org/10.1093/molbev/msad247

• Journal Article Type: Article
• Acceptance Date: Nov 9, 2023
• Online Publication Date: Nov 21, 2023
• Deposit Date: Dec 6, 2023
• Journal: Molecular Biology and Evolution
• Print ISSN: 0737-4038
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Issue: 12
• DOI: https://doi.org/10.1093/molbev/msad247
• Keywords: Genetics, Molecular Biology, Ecology, Evolution, Behavior and Systematics