Publication Details

Reference Category Journals
DOI / URL link
Title (Primary) Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads
Author Betto-Colliard, C.; Hofmann, S.; Sermier, R.; Perrin, N.; Stöck, M.;
Journal Proceedings of the Royal Society B-Biological Sciences
Year 2018
Department NSF;
Volume 285
Issue 1872
Language englisch;
POF III (all) T12;
Data links https://doi.org/10.5061/dryad.7ns38
UFZ wide themes RU1;
Abstract The evolutionary causes and consequences of allopolyploidization, an exceptional pathway to instant hybrid speciation, are poorly investigated in animals. In particular, when and why hybrid polyploids versus diploids are produced, and constraints on sources of paternal and maternal ancestors, remain underexplored. Using the Palearctic green toad radiation (including bisexually reproducing species of three ploidy levels) as model, we generate a range-wide multi-locus phylogeny of 15 taxa and present four new insights: (i) at least five (up to seven) distinct allotriploid and allotetraploid taxa have evolved in the Pleistocene; (ii) all maternal and paternal ancestors of hybrid polyploids stem from two deeply diverged nuclear clades (6 Mya, 3.1–9.6 Mya), with distinctly greater divergence than the parental species of diploid hybrids found at secondary contact zones; (iii) allotriploid taxa possess two conspecific genomes and a deeply diverged allospecific one, suggesting that genomic imbalance and divergence are causal for their partly clonal reproductive mode; (iv) maternal versus paternal genome contributions exhibit asymmetry, with the maternal nuclear (and mitochondrial) genome of polyploids always coming from the same clade, and the paternal genome from the other. We compare our findings with similar patterns in diploid/polyploid vertebrates, and suggest deep ancestral divergence as a precondition for successful allopolyploidization.
ID 20070
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=20070
Betto-Colliard, C., Hofmann, S., Sermier, R., Perrin, N., Stöck, M. (2018):
Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads
Proc. R. Soc. B-Biol. Sci. 285 (1872 ), art. 20172667