Nos tutelles

CNRS

Nos fédérations

Nos partenaires

Rechercher




Accueil > Animation scientifique > Séminaires passés

Séminaire hebdomadaire UGSF - M. Vincent CASTRIC - 30 novembre 2018 - C9 - Salle André Verbert

SEMINAIRE HEBDOMADAIRE DE L’UGSF

"Evolution of functional and regulatory novelty at the self-incompatibility locus in Arabidopsis."

Animé par : M. Vincent Castric, DR CNRS, unité EEP (évolution, écologie et paléontologie) de l’université de Lille.
Invité de l’Equipe "Glycobiologie Végétale", Fabrice WATTEBLED, de l’UMR8576 - Université de Lille

Résumé :

Self-incompatibility in plants of the Brassicaceae family is controlled by a highly diversified molecular lock-and-key system consisting of a large set of specific haplotypic combinations of two tightly linked genes. This system has been a textbook example of natural (balancing) selection, in the form of a strong reproductive advantage for individuals expressing rare alleles. These haplotypes also form a striking linear dominance/recessivity hierarchy, whereby most heterozygote combinations express only one self-incompatibility specificity at the phenotypic level. The question of how so many lock-and-key combinations could arise in the first place and then establish such a complex network of dominance/recessivity interactions raises a series of interesting theoretical and mechanistic problems. In this presentation, I will detail how we are currently using this simple and experimentally tractable biological system to provide insight into the broader issue of how functional and regulatory novelty can arise in natural populations.

Le vendredi 30 novembre 2018 à 11h00 au C9 - Salle André Verbert