Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads.

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State: Serval
Version: Final published version
Serval ID
serval:BIB_A2F48C7B92DA
Type
Article: article from journal or magazin.
Collection
Publications
Title
Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads.
Journal
Proceedings. Biological sciences
Author(s)
Betto-Colliard C., Hofmann S., Sermier R., Perrin N., Stöck M.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
14/02/2018
Peer-reviewed
Oui
Volume
285
Number
1872
Pages
20172667
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
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.
Keywords
Amphibian Proteins/genetics, Amphibian Proteins/metabolism, Animals, Bufonidae/genetics, Cell Nucleus/genetics, DNA, Mitochondrial/genetics, Genetic Speciation, Genetic Variation, Genome, Hybridization, Genetic, Multilocus Sequence Typing, Phylogeny, Polyploidy, Sequence Analysis, DNA, Bufo viridis subgroup, directional asymmetry, divergence, hybridization, multi-locus phylogeny, polyploidy
Pubmed
Web of science
Create date
26/03/2018 14:24
Last modification date
24/01/2019 7:26
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