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• W3135422974 abstract "Abstract Transposable elements (TE) are an important source of genetic variation with a dynamic and content that greatly differ in a wide range of species. The origin of the intraspecific content variation is not always clear and little is known about the precise nature of it. Here, we surveyed the species-wide content of the Ty LTR-retrotransposons in a broad collection of 1,011 Saccharomyces cerevisiae natural isolates to understand what can stand behind the variation of the repertoire, i.e. the type and number of Ty elements. We have compiled an exhaustive catalog of all TE variants present in the S. cerevisiae species by identifying a large set of new variants. The characterization of the TE content in each isolate clearly highlighted that each subpopulation exhibits a unique and specific repertoire, retracing the evolutionary history of the species. Most interestingly, we have shown that ancient interspecific hybridization events had a major impact in the birth of new variants and therefore in the shaping of the TE repertoires. We also investigated the transpositional activity of these elements in a large set of natural isolates, and we found a broad variability related to the level of ploidy as well as the genetic background. Overall, our results pointed out that the evolution of the Ty content is deeply impacted by clade-specific events such as introgressions and therefore follows the population structure. In addition, our study lays the foundation for future investigations to better understand the transpositional regulation and more broadly the TE-host interactions. Authors summary Mobile DNA elements are widely distributed in the genomes of many eukaryotes, but their contents greatly vary between species, populations and even individuals. In fact, little is known about the origin of this variation of transposable element (TE) content across individuals of the same species. Here, we surveyed the Ty LTR-retrotransposon content in a broad collection of 1,011 Saccharomyces cerevisiae yeast natural isolates. We have defined an exhaustive and precise catalog of the TE variants present in the S. cerevisiae species. We found that the TE content follows the evolutionary history of the species because each subpopulation has a unique and specific content. Interestingly, our results highlighted that ancient interspecific hybridization events led to the appearance of new TE variants and therefore had a strong impact on the variation of the TE repertoires in this species. We also investigated the transpositional activity of these elements and found a wide variability related to the genetic background diversity. Altogether, our results have led to a better understanding of the variability of TE content at a species level." @default.
• W3135422974 created "2021-03-15" @default.
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• W3135422974 date "2021-03-01" @default.
• W3135422974 modified "2023-10-17" @default.
• W3135422974 title "Species-wide transposable element repertoires retrace the evolutionary history of the <i>Saccharomyces cerevisiae</i> host" @default.
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• W3135422974 doi "https://doi.org/10.1101/2021.03.01.433327" @default.
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