Temperature-dependent turnovers in sex-determination mechanisms: a quantitative model.

Détails

ID Serval
serval:BIB_B977C469C445
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Temperature-dependent turnovers in sex-determination mechanisms: a quantitative model.
Périodique
Evolution
Auteur(s)
Grossen C., Neuenschwander S., Perrin N.
ISSN
1558-5646[electronic], 0014-3820[linking]
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
65
Numéro
1
Pages
64-78
Langue
anglais
Résumé
Sex determination is often seen as a dichotomous process: individual sex is assumed to be determined either by genetic (genotypic sex determination, GSD) or by environmental factors (environmental sex determination, ESD), most often temperature (temperature sex determination, TSD). We endorse an alternative view, which sees GSD and TSD as the ends of a continuum. Both effects interact a priori, because temperature can affect gene expression at any step along the sex-determination cascade. We propose to define sex-determination systems at the population- (rather than individual) level, via the proportion of variance in phenotypic sex stemming from genetic versus environmental factors, and we formalize this concept in a quantitative-genetics framework. Sex is seen as a threshold trait underlain by a liability factor, and reaction norms allow modeling interactions between genotypic and temperature effects (seen as the necessary consequences of thermodynamic constraints on the underlying physiological processes). As this formalization shows, temperature changes (due to e.g., climatic changes or range expansions) are expected to provoke turnovers in sex-determination mechanisms, by inducing large-scale sex reversal and thereby sex-ratio selection for alternative sex-determining genes. The frequency of turnovers and prevalence of homomorphic sex chromosomes in cold-blooded vertebrates might thus directly relate to the temperature dependence in sex-determination mechanisms.
Mots-clé
Ectothermy, ESD, GSD, quantitative genetics, sex chromosomes, sex reversal, temperature, threshold trait
Pubmed
Web of science
Création de la notice
27/05/2010 8:53
Dernière modification de la notice
03/03/2018 20:51
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