LSM7 is an RNA-binding protein and core component of the U4/U6-U5 tri-snRNP complex that plays critical roles in pre-mRNA splicing and spliceosome assembly 12. As part of the heptameric LSM2-8 complex, LSM7 binds specifically to the 3'-terminal U-tract of U6 snRNA and functions within the precatalytic spliceosome 3. Beyond splicing, LSM7 participates in mRNA degradation pathways; the Pat1-Lsm complex containing LSM7 stabilizes autophagy-related (ATG) mRNA transcripts during nitrogen starvation by preventing 3' to 5' exosomal degradation 4. LSM7 also regulates stress granule formation through liquid-liquid phase separation, creating condensates that serve as scaffolding for stress response mechanisms 5. In disease contexts, biallelic LSM7 variants cause leukodystrophy and neurodegeneration through defective assembly of LSM protein complexes, impairing oligodendrocyte development in zebrafish models 2. LSM7 is overexpressed in multiple cancers—including breast cancer, hepatocellular carcinoma, and non-small cell lung cancer—where it promotes metastasis and poor prognosis 678. In breast cancer specifically, LSM7 enhances expression of the CD44s splice isoform, driving invasion and metastasis 6. Emerging evidence suggests LSM7 may be implicated in Parkinson's disease pathogenesis 9. These findings position LSM7 as both a critical splicing regulator and a potential therapeutic target across multiple disease contexts.