Titre
Origin and genome evolution of polyploid green toads in Central Asia: evidence from microsatellite markers.
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Betto-Colliard, C.
Auteure/Auteur
Sermier, R.
Auteure/Auteur
Litvinchuk, S.
Auteure/Auteur
Perrin, N.
Auteure/Auteur
Stöck, M.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
1365-2540
Statut éditorial
Publié
Date de publication
2015
Volume
114
Numéro
3
Première page
300
Dernière page/numéro d’article
308
Peer-reviewed
Oui
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.
PID Serval
serval:BIB_FE2DCD88BC49
PMID
Open Access
Oui
Date de création
2014-09-23T04:52:47.883Z
Date de création dans IRIS
2025-05-21T06:19:39Z