Guardians of splicing: quality control mechanisms of snRNA variants.

Distinct quality control systems degrade snRNA variants, with nuclear RNA exosome and cytoplasmic TUT4/7-initiated decay eliminating variants from pseudogenes or with defective 3' processing or RNP assembly.

• Why it matters: Cells must keep a functional pool of snRNP complexes, but how snRNA variants are selectively cleared—and how this fails in disease—was unclear.
• What they did: Ma and colleagues identified degradation routes for snRNA variants expressed from snRNA pseudogenes and for variants deficient in 3' end processing or RNP assembly, implicating the nuclear RNA exosome and cytoplasmic TUT4/7 enzymes.
• The result: Stabilized variant snRNAs can assemble into spliceosomes and alter splicing, and pathogenic mutations in canonical snRNA genes can trigger aberrant degradation, potentially contributing to disease pathology.

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