Conférence Susana COELHO, CR CNRS UMR 8227 PDF Imprimer Envoyer
Mercredi, 25 Mars 2015 19:06
Conférence Susana COELHO, CR CNRS UMR 8227

Tout ce que vous avez toujours voulu savoir sur le sexe (des algues) sans jamais oser le demander

Equipe Génétique des Algues
UMR 8227 CNRS-UPMC
Station Biologique de Roscoff

Vendredi 3 avril 2015
12h45/13h45

Amphi 2 - Faculté de Médecine, 22 av. Camille Desmoulins - Brest

"Tout ce que vous avez toujours

voulu savoir sur

le sexe (des algues) sans jamais

oser le demander"

 

Sexual reproduction is an extraordinarily widespread phenomenon that assures the production of new genetic combinations in nearly all eukaryotic lineages. Although the core mechanisms of sexual reproduction (meiosis and syngamy) are highly conserved, the control mechanisms that determine whether an individual is male or female are remarkably labile across eukaryotes. In genetically controlled sexual systems, gender is determined by sex chromosomes, which have emerged independently and repeatedly during evolution. Sex chromosomes have been studied in only a handful of classical model organism, and empirical knowledge on the origin and evolution of the sexes is still surprisingly incomplete. Our team is exploiting the remarkable richness of sexual characteristics of the brown algae to gain novel insights into the functional and evolutionary interactions between the sex chromosomes and key eukaryotic reproductive and life cycle features. In particular we are using Ectocarpus, a model brown alga, to shed light on the mechanisms of sex determination and differentiation in a lineage a billion year-distant from plants and animals.

 
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