ArticleProceedings of the National Academy of Sciences of the United States of America2024
Sm complex assembly and 5' cap trimethylation promote selective processing of snRNAs by the 3' exonuclease TOE1.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 9 citations in OpenAlex.
- Multiple quality control checkpoints safeguard small nuclear RNA biogenesis and prevent assembly of aberrant spliceosomes.Genes & development · 2026Article
- Spliceosomal proteins direct RNA methylation to modulate gene expression and silence retrotransposons.Nature communications · 2026Article
- TOE1 is a β-catenin interacting protein regulating the proliferation of hematopoietic cells through PAK2 modulation.Stem cell reports · 2026Article
- Adulthood depletion of Integrator extends lifespan and healthspan via defective pre-mRNA processing.bioRxiv : the preprint server for biology · 2026Article
- Widespread mono- and oligoadenylation direct small noncoding RNA maturation versus degradation fates.The EMBO journal · 2026Article
- Transcriptomic analysis reveals the potential role of TOE1 in hepatocellular carcinoma.Scientific reports · 2025Article
- Multiple Quality Control Checkpoints Safeguard Small Nuclear RNA Biogenesis and Prevent Assembly of Aberrant Spliceosomes.bioRxiv : the preprint server for biology · 2025Article
- Biochemical characterizations of Pontocerebellar Hypoplasia linked mutations of Target of Egr1 (TOE1) reveal impacts on thermal stability, ribonuclease activity, and oligomerization.bioRxiv : the preprint server for biology · 2025Article
- The human branchpoint-interacting stem loop sequence and structure regulates U2 snRNA expression, branchpoint recognition, and transcriptome.bioRxiv : the preprint server for biology · 2025Article
- A guide to the biogenesis and functions of endogenous small non-coding RNAs in animals.Nature reviews. Molecular cell biology · 2025Review
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4 authors at 1 institution in 1 country.
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Abstract
Competing exonucleases that promote 3' end maturation or degradation direct quality control of small non-coding RNAs, but how these enzymes distinguish normal from aberrant RNAs is poorly understood. The Pontocerebellar Hypoplasia 7 (PCH7)-associated 3' exonuclease TOE1 promotes maturation of canonical small nuclear RNAs (snRNAs). Here, we demonstrate that TOE1 achieves specificity toward canonical snRNAs through their Sm complex assembly and cap trimethylation, two features that distinguish snRNAs undergoing correct biogenesis from other small non-coding RNAs. Indeed, disruption of Sm complex assembly via snRNA mutations or protein depletions obstructs snRNA processing by TOE1, and in vitro snRNA processing by TOE1 is stimulated by a trimethylated cap. An unstable snRNA variant that normally fails to undergo maturation becomes fully processed by TOE1 when its degenerate Sm binding motif is converted into a canonical one. Our findings uncover the molecular basis for how TOE1 distinguishes snRNAs from other small non-coding RNAs and explain how TOE1 promotes maturation specifically of canonical snRNAs undergoing proper processing.
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