A team at Harvard Medical School and Washington University demonstrates that reducing 18S rRNA N6-dimethyladenosine methyltransferase DIMT-1 in Caenorhabditis elegans germline enhances translation of stress-resistance proteins via selective ribosome binding, dependent on DAF-16 and TOR signaling, thereby promoting healthy aging.
Key points
- DIMT-1 catalyzes N6,N6-dimethylation of 18S rRNA; its mutation or RNAi knockdown extends C. elegans lifespan by up to 40%.
- Auxin-inducible degron depletion and tissue-specific RNAi pinpoint germline DIMT-1 loss as critical for enhanced stress resistance and longevity.
- TRAP-seq profiling reveals altered ribosome binding to stress-defense and longevity transcripts, including daf-9, linking epitranscriptomic changes to germline-to-soma signaling via DAF-12.
Why it matters: This study establishes rRNA methylation as a tunable epitranscriptomic lever for controlling organismal aging and highlights germline translation dynamics as a target for longevity interventions.
Q&A
- What is the role of DIMT-1 in rRNA methylation?
- How does germline-specific DIMT-1 depletion affect lifespan?
- What techniques revealed changes in ribosome binding?
- Why is the germline essential for DIMT-1’s lifespan effect?