Limited Introgression between Rock-Wallabies with Extensive Chromosomal Rearrangements

Date

2022

Authors

Potter, Sally
Bragg, Jason
Turakulov, Rustamzhon
Eldridge, Mark D.B.
Deakin, Janine
Kirkpatrick, Mark
Edwards, Richard
Moritz, Craig

Journal Title

Journal ISSN

Volume Title

Publisher

Society for Molecular Biology Evolution

Abstract

Chromosome rearrangements can result in the rapid evolution of hybrid incompatibilities. Robertsonian fusions, particularly those with monobrachial homology, can drive reproductive isolation amongst recently diverged taxa. The recent radiation of rock-wallabies (genus Petrogale) is an important model to explore the role of Robertsonian fusions in speciation. Here we pursue that goal using an extensive sampling of populations and genomes of Petrogale from north-eastern Australia. In contrast to previous assessments using mitochondrial DNA or nuclear microsatellite loci, genomic data are able to separate the most closely related species and to resolve their divergence histories. Both phylogenetic and population genetic analyses indicate introgression between two species that differ by a single Robertsonian fusion. Based on the available data, there is also evidence for introgression between two species which share complex chromosomal rearrangements. However, the remaining results show no consistent signature of introgression amongst species pairs and where evident, indicate generally low introgression overall. X-linked loci have elevated divergence compared to autosomal loci indicating a potential role for genic evolution to produce reproductive isolation in concert with chromosome change. Our results highlight the value of genome scale data in evaluating the role of Robertsonian fusions and structural variation in divergence, speciation and patterns of molecular evolution.

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Keywords

chromosome rearrangement, introgression, marsupial, speciation, Robertsonian fusion

Citation

Source

Molecular Biology and Evolution

Type

Journal article

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Access Statement

Open Access

License Rights

Creative Commons Attribution-NonCommercial License

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