Horizontal Transfer and Recombination Fuel Ty4 Retrotransposon Evolution in Saccharomyces

Overview

Journal Genome Biol Evol

Publisher Oxford University Press

Date 2025 Jan 9

PMID 39786570

Authors

Jingxuan Chen

David J Garfinkel

Casey M Bergman

Affiliations

Soon will be listed here.

Abstract

Horizontal transposon transfer (HTT) plays an important role in the evolution of eukaryotic genomes; however, the detailed evolutionary history and impact of most HTT events remain to be elucidated. To better understand the process of HTT in closely related microbial eukaryotes, we studied Ty4 retrotransposon subfamily content and sequence evolution across the genus Saccharomyces using short- and long-read whole genome sequence data, including new PacBio genome assemblies for two Saccharomyces mikatae strains. We find evidence for multiple independent HTT events introducing the Tsu4 subfamily into specific lineages of Saccharomyces paradoxus, Saccharomyces cerevisiae, Saccharomyces eubayanus, Saccharomyces kudriavzevii and the ancestor of the S. mikatae/Saccharomyces jurei species pair. In both S. mikatae and S. kudriavzevii, we identified novel Ty4 clades that were independently generated through recombination between resident and horizontally transferred subfamilies. Our results reveal that recurrent HTT and lineage-specific extinction events lead to a complex pattern of Ty4 subfamily content across the genus Saccharomyces. Moreover, our results demonstrate how HTT can lead to coexistence of related retrotransposon subfamilies in the same genome that can fuel evolution of new retrotransposon clades via recombination.

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