What is LC-1 large-cargo-optimized lipid nanoparticles for genome editing?

Genome editing means changing the DNA inside a living organism — inserting, deleting or replacing part of it. One way to get the editing instructions into cells in a living body is to pack them into lipid nanoparticles: very small spheres made of fats, the same general class of carrier that coats the fragile mRNA in COVID-19 mRNA vaccines, with an ionizable lipid inside doing the job of binding the RNA. Those carriers tend to lose potency as the RNA transcript they carry gets larger, and that is the problem LC-1 is for. LC-1 is the lead large-cargo-optimized ionizable lipid from a screen of 384 lipids against a 5.7-kilobase mRNA (about 5,700 RNA letters — a deliberately large test cargo), reported in Nature Biotechnology on 28 September 2026 by a University of Toronto group, with editing measured in the liver, lung and brain of mice.

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