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Title: A unique ecological niche fosters hybridization of oak-tree and vineyard isolates of Saccharomyces cerevisiae

Journal Article · · Molecular Ecology
DOI:https://doi.org/10.1111/mec.13439· OSTI ID:1466771
 [1];  [1];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States). Laboratory of Genetics
  2. Univ. of Wisconsin, Madison, WI (United States). Laboratory of Genetics; Great Lakes Bioenergy Research Center, Madison, WI (United States)

We report that differential adaptation to distinct niches can restrict gene flow and promote population differentiation within a species. However, in some cases the distinction between niches can collapse, forming a hybrid niche with features of both environments. We previously reported that distinctions between vineyards and oak soil present an ecological barrier that restricts gene flow between lineages of Saccharomyces cerevisiae. Vineyard isolates are tolerant to stresses associated with grapes while North American oak strains are particularly tolerant to freeze–thaw cycles. Here, we report the isolation of S. cerevisiae strains from Wisconsin cherry trees, which display features common to vineyards (e.g. high sugar concentrations) and frequent freeze–thaw cycles. Genome sequencing revealed that the isolated strains are highly heterozygous and represent recent hybrids of the oak × vineyard lineages. We found that the hybrid strains are phenotypically similar to vineyard strains for some traits, but are more similar to oak strains for other traits. The cherry strains were exceptionally good at growing in cherry juice, raising the possibility that they have adapted to this niche. We performed transcriptome profiling in cherry, oak and vineyard strains and show that the cherry-tree hybrids display vineyard-like or oak-like expression, depending on the gene sets, and in some cases, the expression patterns linked back to shared stress tolerances. Allele-specific expression in these natural hybrids suggested concerted cis-regulatory evolution at sets of functionally regulated genes. In conclusion, our results raise the possibility that hybridization of the two lineages provides a genetic solution to the thriving in this unique niche.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FC02-07ER64494
OSTI ID:
1466771
Journal Information:
Molecular Ecology, Vol. 24, Issue 23; ISSN 0962-1083
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (7)

Evolutionary biology through the lens of budding yeast comparative genomics journal July 2017
No evidence for extrinsic post-zygotic isolation in a wild Saccharomyces yeast system journal June 2017
Whole Genome Comparison Reveals High Levels of Inbreeding and Strain Redundancy Across the Spectrum of Commercial Wine Strains of Saccharomyces cerevisiae journal February 2016
Intrinsic cooperativity potentiates parallel cis-regulatory evolution journal September 2018
Data from: A unique ecological niche fosters hybridization of oak-tree and vineyard isolates of Saccharomyces cerevisiae. dataset January 2015
Modeling the contributions of chromosome segregation errors and aneuploidy to Saccharomyces hybrid sterility: Saccharomyces hybrid meiosis journal November 2017
Intrinsic cooperativity potentiates parallel cis-regulatory evolution journal April 2018


Figures / Tables (6)