Social wasps are a Saccharomyces mating nest

Proc Natl Acad Sci U S A. 2016 Feb 23;113(8):2247-51. doi: 10.1073/pnas.1516453113. Epub 2016 Jan 19.

Abstract

The reproductive ecology of Saccharomyces cerevisiae is still largely unknown. Recent evidence of interspecific hybridization, high levels of strain heterozygosity, and prion transmission suggest that outbreeding occurs frequently in yeasts. Nevertheless, the place where yeasts mate and recombine in the wild has not been identified. We found that the intestine of social wasps hosts highly outbred S. cerevisiae strains as well as a rare S. cerevisiae×S. paradoxus hybrid. We show that the intestine of Polistes dominula social wasps favors the mating of S. cerevisiae strains among themselves and with S. paradoxus cells by providing a succession of environmental conditions prompting cell sporulation and spores germination. In addition, we prove that heterospecific mating is the only option for European S. paradoxus strains to survive in the gut. Taken together, these findings unveil the best hidden secret of yeast ecology, introducing the insect gut as an environmental alcove in which crosses occur, maintaining and generating the diversity of the ascomycetes.

Keywords: Saccharomyces cerevisiae; Saccharomyces paradoxus; hybrids; social wasps; yeasts.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biodiversity
  • Crosses, Genetic
  • Gastrointestinal Microbiome
  • Reproduction / genetics
  • Reproduction / physiology
  • Saccharomyces / genetics*
  • Saccharomyces / physiology*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / physiology
  • Spores, Fungal / genetics
  • Spores, Fungal / physiology
  • Wasps / microbiology*