A polyploid population of Saccharomyces cerevisiae with separate sexes (dioecy).

Abstract

Saccharomyces cerevisiae has proved to be an interesting model for studies of evolution, with whole-genome duplication shown to have played an important role in the evolution of this species. This phenomenon depends on the formation of a transient stable polyploid state. Previous studies have reported polyploidy to be an unstable state in yeast, but here, we describe a polyploid population of S. cerevisiae. The evolution of higher eukaryotes has also involved the development of different systems of sexual reproduction, the choice between self-fertilization and out-crossing becoming a key issue. Saccharomyces cerevisiae is a hermaphrodite eukaryote, despite the theoretical genetic disadvantages of this strategy, in which self-fertilization occurs. We describe, for the first time, a near-dioecious (with separate sexes) population in this species. Mating type and the MAT locus display complex segregations. Essentially, each strain produces, by meiosis, spores of only one mating type: mata or matalpha. Moreover, strains are heterothallic, and diploid nonmating clones generated from a single spore do not sporulate. These three properties limit self-fertilization and strongly favour out-crossing. We suggest that the shift in sexual strategy, from hermaphroditism to dioecy, is specific to the brewing process, which overcomes the sexual isolation probably found in natural biotopes.

DOI: 10.1111/j.1567-1364.2010.00660.x

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@article{Safadi2010APP, title={A polyploid population of Saccharomyces cerevisiae with separate sexes (dioecy).}, author={Rim Al Safadi and Mich{\`e}le Weiss-Gayet and J{\'e}r{\^o}me Briolay and Michel Aigle}, journal={FEMS yeast research}, year={2010}, volume={10 6}, pages={757-68} }