Preprint investigates how P-element transposon drives hybrid dysgenesis in Drosophila simulans germline

A preprint posted to bioRxiv examines hybrid dysgenesis caused by the P-element, a DNA transposon, in Drosophila simulans — a species in which the P-element has independently invaded the genome, providing a natural evolutionary replicate of the process documented in D. melanogaster.

Hybrid dysgenesis describes a syndrome of reproductive abnormalities, including sterility, gonadal atrophy, elevated mutation rates, and genome rearrangements, that arises when flies carrying P-elements mate with flies that lack the small regulatory RNAs (piRNAs, associated with PIWI proteins) needed to suppress transposon activity in the germline. The phenotype is cross-direction specific: it is observed when fathers carry P-elements but mothers do not supply suppressing piRNAs, not in the reciprocal cross.

The work contributes to understanding of how genomes defend against transposable element invasion, and how suppression mechanisms can evolve rapidly after transposon acquisition. The study is relevant to researchers working on germline biology, transposon biology, piRNA pathways, and the evolutionary genetics of host–transposon co-evolution. The preprint has not yet been peer-reviewed.