Polyploidy breaks speciation barriers in Australian burrowing frogs Neobatrachus

Autoři: Polina Yu. Novikova aff001;  Ian G. Brennan aff003;  William Booker aff004;  Michael Mahony aff005;  Paul Doughty aff006;  Alan R. Lemmon aff007;  Emily Moriarty Lemmon aff004;  J. Dale Roberts aff008;  Levi Yant aff009;  Yves Van de Peer aff001;  J. Scott Keogh aff003;  Stephen C. Donnellan aff012
Působiště autorů: VIB-UGent Center for Plant Systems Biology, Ghent, Belgium aff001;  Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium aff002;  Division of Ecology & Evolution, Research School of Biology, The Australian National University, Canberra, Australia aff003;  Department of Biological Science, Florida State University, Tallahassee, Florida, United States of America aff004;  School of Environmental and Life Sciences, University of Newcastle, Callaghan, Australia aff005;  Western Australian Museum, Welshpool, Perth, Australia aff006;  Department of Scientific Computing, Florida State University, Tallahassee, Florida, United States of America aff007;  School of Biological Sciences, and, Centre for Evolutionary Biology, University of Western Australia, Albany, Western Australia, Australia aff008;  School of Life Sciences and Future Food Beacon, University of Nottingham, Nottingham, United Kingdom aff009;  Bioinformatics Institute Ghent, Ghent University, Ghent, Belgium aff010;  Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa aff011;  South Australian Museum, North Terrace, Adelaide, Australia aff012;  School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, Australia aff013
Vyšlo v časopise: Polyploidy breaks speciation barriers in Australian burrowing frogs Neobatrachus. PLoS Genet 16(5): e32767. doi:10.1371/journal.pgen.1008769
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008769


Polyploidy has played an important role in evolution across the tree of life but it is still unclear how polyploid lineages may persist after their initial formation. While both common and well-studied in plants, polyploidy is rare in animals and generally less understood. The Australian burrowing frog genus Neobatrachus is comprised of six diploid and three polyploid species and offers a powerful animal polyploid model system. We generated exome-capture sequence data from 87 individuals representing all nine species of Neobatrachus to investigate species-level relationships, the origin and inheritance mode of polyploid species, and the population genomic effects of polyploidy on genus-wide demography. We describe rapid speciation of diploid Neobatrachus species and show that the three independently originated polyploid species have tetrasomic or mixed inheritance. We document higher genetic diversity in tetraploids, resulting from widespread gene flow between the tetraploids, asymmetric inter-ploidy gene flow directed from sympatric diploids to tetraploids, and isolation of diploid species from each other. We also constructed models of ecologically suitable areas for each species to investigate the impact of climate on differing ploidy levels. These models suggest substantial change in suitable areas compared to past climate, which correspond to population genomic estimates of demographic histories. We propose that Neobatrachus diploids may be suffering the early genomic impacts of climate-induced habitat loss, while tetraploids appear to be avoiding this fate, possibly due to widespread gene flow. Finally, we demonstrate that Neobatrachus is an attractive model to study the effects of ploidy on the evolution of adaptation in animals.

Klíčová slova:

Amphibian genomics – Gene flow – Genetic loci – Phylogenetic analysis – Ploidy – Polyploidy – Sequence alignment – Tetraploidy


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