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Many interspecific chromosomal introgressions are highly prevalent in Holarctic Saccharomyces uvarum strains found in human‐related fermentations
Author(s) -
Albertin Warren,
Chernova Maria,
Durrens Pascal,
Guichoux Erwan,
Sherman David James,
MasneufPomarede Isabelle,
Marullo Philippe
Publication year - 2018
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.3248
Subject(s) - biology , introgression , genetics , holarctic , locus (genetics) , saccharomyces , mendelian inheritance , genome , gene , saccharomyces cerevisiae , genus , botany
In the last two decades, the extensive genome sequencing of strains belonging to the Saccharomyces genus has revealed the complex reticulated evolution of this group. Among the various evolutionary mechanisms described, the introgression of large chromosomal regions resulting from interspecific hybridization has recently shed light on Saccharomyces uvarum species. In this work we provide the de novo assembled genomes of four S. uvarum strains presenting more than 712 kb of introgressed loci inherited from both Saccharomyces eubayanus and Saccharomyces kudriavzevii species. In order to study the prevalence of such introgressions in a large population, we designed multiplexed PCR markers able to survey the inheritance of eight chromosomal regions. Our data confirm that introgressions are widely disseminated in Holarctic S. uvarum populations and are more frequently found in strains isolated from human‐related fermentations. According to the origin of the strains (nature or cider‐ or wine‐related processes), some loci are over‐represented, suggesting their positive selection by human activity. Except for one locus located on chromosome 7, the introgressions present a low level of heterozygozity similar to that observed for nine neutral markers (microsatellites). Finally, most of the loci tested showed an expected Mendelian segregation after meiosis and can recombine with their chromosomal counterpart in S. uvarum . Copyright © 2017 John Wiley & Sons, Ltd.