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2016 ; 113
(8
): 2247-51
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Social wasps are a Saccharomyces mating nest
#MMPMID26787874
Stefanini I
; Dapporto L
; Berná L
; Polsinelli M
; Turillazzi S
; Cavalieri D
Proc Natl Acad Sci U S A
2016[Feb]; 113
(8
): 2247-51
PMID26787874
show ga
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.