Origin and genome evolution of polyploid green toads in Central Asia: evidence from microsatellite markers.

Détails

ID Serval
serval:BIB_FE2DCD88BC49
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Origin and genome evolution of polyploid green toads in Central Asia: evidence from microsatellite markers.
Périodique
Heredity
Auteur(s)
Betto-Colliard C., Sermier R., Litvinchuk S., Perrin N., Stöck M.
ISSN
1365-2540 (Electronic)
ISSN-L
0018-067X
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
114
Numéro
3
Pages
300-308
Langue
anglais
Résumé
Polyploidization, which is expected to trigger major genomic reorganizations, occurs much less commonly in animals than in plants, possibly because of constraints imposed by sex-determination systems. We investigated the origins and consequences of allopolyploidization in Palearctic green toads (Bufo viridis subgroup) from Central Asia, with three ploidy levels and different modes of genome transmission (sexual versus clonal), to (i) establish a topology for the reticulate phylogeny in a species-rich radiation involving several closely related lineages and (ii) explore processes of genomic reorganization that may follow polyploidization. Sibship analyses based on 30 cross-amplifying microsatellite markers substantiated the maternal origins and revealed the paternal origins and relationships of subgenomes in allopolyploids. Analyses of the synteny of linkage groups identified three markers affected by translocation events, which occurred only within the paternally inherited subgenomes of allopolyploid toads and exclusively affected the linkage group that determines sex in several diploid species of the green toad radiation. Recombination rates did not differ between diploid and polyploid toad species, and were overall much reduced in males, independent of linkage group and ploidy levels. Clonally transmitted subgenomes in allotriploid toads provided support for strong genetic drift, presumably resulting from recombination arrest. The Palearctic green toad radiation seems to offer unique opportunities to investigate the consequences of polyploidization and clonal transmission on the dynamics of genomes in vertebrates.
Mots-clé
Bufo viridis, clonal transmission, genome reorganization, phylogeny, polyploidy, sex chromosomes
Pubmed
Web of science
Open Access
Oui
Création de la notice
23/09/2014 5:52
Dernière modification de la notice
20/08/2019 16:28
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