ArticleNature communications2025
PYM1 limits non-canonical Exon Junction Complex occupancy in a gene architecture dependent manner to tune mRNA expression.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Gene regulation through exon junction complex modularity.Nature structural & molecular biology · 2025Review
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Abstract
The Exon Junction Complex (EJC) decorates RNA exon-exon junctions and modulates mRNA fate at multiple post-transcriptional steps until its disassembly during translation. Our investigation of the EJC disassembly factor PYM1 in human embryonic kidney 293 (HEK293) cells show that the EJC-PYM1 interaction is required for translation-independent EJC destabilization but not for translation-dependent disassembly. Surprisingly, PYM1 interaction deficient EJCs are enriched on locations away from canonical EJC binding site, particularly on transcripts with no or few introns. Such non-canonical EJCs are capable of inducing nonsense-mediated mRNA decay when present downstream of stop codons. Suppression of PYM1 in human cells, including by previously reported PYM1-flavivirus capsid protein interaction, stabilizes mRNAs with fewer and longer exons that localize to endoplasmic reticulum associated TIS-granules. In summary, PYM1 limits non-canonical EJC and thereby acts as an EJC specificity factor that is hijacked by flaviviruses to reshape host cell mRNA regulation.
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