Sex chromosome turnovers and genetic drift: a simulation study.

Détails

ID Serval
serval:BIB_81445E80C6C9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Sex chromosome turnovers and genetic drift: a simulation study.
Périodique
Journal of Evolutionary Biology
Auteur(s)
Saunders P.A., Neuenschwander S., Perrin N.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
31
Numéro
9
Pages
1413-1419
Langue
anglais
Résumé
The recent advances of new genomic technologies have enabled the identification and characterization of sex chromosomes in an increasing number of nonmodel species, revealing that many plants and animals undergo frequent sex chromosome turnovers. What evolutionary forces drive these turnovers remains poorly understood, but it was recently proposed that drift might play a more important role than generally assumed. We analysed the dynamics of different types of turnovers using individual-based simulations and show that when mediated by genetic drift, turnovers are usually easier to achieve than substitutions at neutral markers, but that their dynamics and relative likelihoods vary with the type of the resident and emergent sex chromosome system (XY and/or ZW) and the dominance relationships among the sex-determining factors. Focusing on turnovers driven by epistatically dominant mutations, we find that drift-mediated turnovers that preserve the heterogamety pattern are 2-4× more likely than those along which the heterogametic sex changes. This ratio nevertheless decreases along with effective population size and can even reverse in case of extreme polygyny. This can be attributed to a 'drift-induced' selective force, known to influence transitions between male and female heterogamety, but which according to our study does not affect turnovers that preserve the heterogametic sex.
Mots-clé
genetic drift, individual-based simulations, quantiNemo, sex determination, sex ratio selection, transitions
Pubmed
Web of science
Création de la notice
18/07/2018 16:31
Dernière modification de la notice
22/09/2018 6:26
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