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Marsupials as models for understanding the role of chromosome rearrangements in evolution and disease

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Abstract

Chromosome rearrangements have been implicated in diseases, such as cancer, and speciation, but it remains unclear whether rearrangements are causal or merely a consequence of these processes. Two marsupial families with very different rates of karyotype evolution provide excellent models in which to study the role of chromosome rearrangements in a disease and evolutionary context. The speciose family Dasyuridae displays remarkable karyotypic conservation, with all species examined to date possessing nearly identical karyotypes. Despite the seemingly high degree of chromosome stability within this family, they appear prone to developing tumours, including transmissible devil facial tumours. In contrast, chromosome rearrangements have been frequent in the evolution of the species-rich family Macropodidae, which displays a high level of karyotypic diversity. In particular, the genus Petrogale (rock-wallabies) displays an extraordinary level of chromosome rearrangement among species. For six parapatric Petrogale species, it appears that speciation has essentially been caught in the act, providing an opportunity to determine whether chromosomal rearrangements are a cause or consequence of speciation in this system. This review highlights the reasons that these two marsupial families are excellent models for testing hypotheses for hotspots of chromosome rearrangement and deciphering the role of chromosome rearrangements in disease and speciation.

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Acknowledgments

We thank our collaborators A. Pearse, K. Swift and G. Woods who have provided chromosome preparations for our work on devils and devil facial tumour disease.

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Correspondence to Janine E. Deakin.

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Funding

JED has been supported by an Australian Research Council Future Fellowship (FT100100241) for work on Tasmanian devil and devil facial tumour chromosomes. An Australian Research Council Discovery Project (DP160100187) awarded to JED, Jason Bragg, Craig Moritz, Mark Eldridge and Mark Kirkpatrick is supporting our current work on chromosomal speciation in rock-wallabies.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Deakin, J.E., Kruger-Andrzejewska, M. Marsupials as models for understanding the role of chromosome rearrangements in evolution and disease. Chromosoma 125, 633–644 (2016). https://doi.org/10.1007/s00412-016-0603-8

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  • DOI: https://doi.org/10.1007/s00412-016-0603-8

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