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The system that produces a seemingly useless decoy DNA, deadly to the phage.
Famille à trois composants : ncRNA → RT → multicopy single-stranded DNA (msDNA) → effecteur toxique conditionnel. Les retrons sont à la fois système de défense anti-phage ET outil d'édition génomique (RLR) largement étudié. Plateforme de biologie synthétique mature.
Retrons were discovered in the 1980s as a bacterial curiosity: genomic elements that produce a single-stranded DNA chimerically linked to an RNA (the msDNA = multicopy single-stranded DNA), via their own reverse transcriptase. For 30 years, nobody knew what they were for. Bobonis et al. (2022, Nature) finally figured it out: retrons form a conditional toxin-antitoxin complex in which the msDNA acts as a "sensor" of physiological state. Upon phage infection, the msDNA is altered or released, which triggers the toxin and kills the cell (aborting the infection). It's defense by decoy + switch — peak elegance.
Retron RT = biochemical proxy for human LINE-1 (a target in aging, autoimmunity, neuro-inflammation). Testing approved antiretroviral NRTIs (tenofovir, lamivudine) on retron RT could reveal candidates for repositioning these molecules as LINE-1 modulators.
Retrons are now used as a genome editing tool under the name RLR (Retron Library Recombineering). They make it possible to generate large-scale libraries of mutations in vivo. It's one of the rare cases where a bacterial defense discovery immediately translated into a biotech tool usable by other labs. The retron RT is also phylogenetically related to human LINE-1 (the most abundant retrotransposon in our genome, ~17%).
