{
  "id": 18093018,
  "title": "A noncanonical function of Dicer fuels self-dsRNA-driven inflammation",
  "url": "https://urgent.news/2026/11/03/a-noncanonical-function-of-dicer-fuels-self-dsrna-driven-inflammation",
  "topic": "science",
  "section": "Science",
  "published": "2026-11-03T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.10.29.761885v1?rss=1"
  },
  "original_language": "en",
  "account": "A recent study has uncovered a previously unknown function of the Dicer enzyme in fueling inflammation stemming from self-derived double-stranded RNAs (self-dsRNAs). Self-dsRNAs are generated through defects in RNA editing, splicing, epigenetic silencing, or mitochondrial RNA degradation, and can activate the immune system, leading to a condition known as autoinflammation.\n\nThe researchers identified a previously unappreciated role for Dicer in the processing of self-dsRNAs, as well as the necessity of the LGP2 protein for this inflammatory response. Importantly, Dicer's activity is distinct from its well-known role in microRNA biogenesis, as it enables the conversion of short, structurally constrained self-dsRNAs into immunostimulatory ligands. This conversion occurs through Dicer binding to the self-dsRNAs and using its catalytic activity to generate shorter duplexes with accessible ends. These shorter duplexes are then available for binding by LGP2, which facilitates the assembly of MDA5 filaments, a key player in triggering inflammation.\n\nThe findings reveal a broad requirement for Dicer and LGP2 in the inflammatory response to self-dsRNAs, and the process is observed across multiple cell types, including a human stem cell-derived model of neuroinflammation. The study demonstrates that Dicer can transform short, constrained self-dsRNAs into strong inflammatory signals, effectively acting as a link between defective RNA processing and the activation of the immune system.",
  "summary": "Self-derived double-stranded RNAs (self-dsRNAs) can drive autoinflammation, but how structurally constrained self-dsRNAs become immunostimulatory remains unclear. We identify a noncanonical role for Dicer and a broad requirement for LGP2 in this process. Dicer is required for responses to self-dsRNAs, but not exogenous dsRNAs, that arise from defects in RNA editing, splicing, epigenetic…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}