Longevity & AgingNew spatial map reveals where RNA m6A marks sit inside intact mouse tissues
RNA carries chemical tags, and one of the most common, N6-methyladenosine (m6A), helps control how genes are used. Until now, researchers could rarely see where m6A sits within intact tissue. This study introduces m6A-ARTR-DBiT, a method that combines reverse-transcription-based m6A detection with in-tissue spatial barcoding to map m6A across the transcriptome while keeping tissue architecture intact. The authors applied it to mouse embryonic tissues and adult brains and found region-specific m6A patterns across functional domains. m6A levels correlated positively with expression of m6A writer enzymes (methyltransferases) and binding proteins, which helped identify tissue-region-specific epitranscriptomic regulation. In the hippocampus, the method resolved m6A organization within fine-scale structures. The work is a tool-development advance in mice, not a clinical study, but it opens a path to studying RNA modifications in development, brain function, and aging-related disease.
