Preprint identifies small non-coding RNAs as participants in DNA double-strand break repair in Arabidopsis

A preprint posted to bioRxiv describes a study in Arabidopsis thaliana examining the role of small non-coding RNAs in the repair of DNA double-strand breaks (DSBs) — among the most toxic forms of DNA damage, capable of causing chromosomal rearrangements or cell death if left unrepaired.

The researchers report that small RNAs are produced at sequences flanking induced DSB sites in Arabidopsis and that these so-called DSB-induced small RNAs (diRNAs) appear to influence which repair pathway is engaged. Multiple conserved DSB repair pathways exist — including homologous recombination and non-homologous end joining — and each produces different outcomes in terms of fidelity and genomic consequence. The work builds on a body of evidence, largely from animal and yeast systems, suggesting RNA participates in repair processes beyond its canonical role in gene expression.

The study is notable for demonstrating this mechanism in a plant model, broadening the phylogenetic scope of RNA-mediated genome maintenance and raising questions about whether diRNA-based regulation of DSB repair is a widespread feature of eukaryotic biology.

As a preprint, these findings are preliminary and have not yet undergone peer review. The work is most relevant to plant molecular biologists, DNA repair researchers, and RNA biologists.