ArticleNucleic acids research2026
The stability of m6A-marked transcripts is linked to cell identity in planarians.
Article in Nucleic acids research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
N 6-methyladenosine (m6A) is a prevalent internal modification of eukaryotic mRNA that influences transcript fate, including mRNA stability and cell-type-specific gene expression. However, the mechanisms underlying m6A-mediated regulation remain poorly understood in many systems, including the highly regenerative planarian Schmidtea mediterranea. To address this, we generated a high-confidence atlas of ∼72 200 m6A sites across the planarian transcriptome using multiplexed direct RNA sequencing. The m6A sites follow a DRAYW consensus motif and are highly enriched near stop codons while being largely excluded from coding sequences. This pattern aligns with an exon and intron length-dependent variant of the exon junction complex (EJC)-mediated exclusion model, wherein the EJC restricts m6A deposition near splice sites. Knockdown of the m6A writer complex induced pronounced, cell-type-specific changes in transcript stability. Destabilized transcripts were enriched for intestinal markers, whereas stabilized transcripts were associated with neoblasts, the adult stem cells of planarians. Transcriptional shut-off experiments confirmed that m6A has opposing effects on mRNA decay depending on cellular context: it stabilizes transcripts in differentiated cells, while it promotes the degradation of mRNAs associated with neoblasts. Collectively, these results support a model in which cell-type-specific regulation of mRNA stability by m6A plays a crucial role in shaping cell identity in planarians.
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