DIS3L is a catalytic 3'→5' exoribonuclease component of the cytoplasmic RNA exosome complex with broad roles in RNA metabolism 1. Its primary function is degrading cytoplasmic RNAs, including mRNAs with AU-rich elements in their 3' untranslated regions and histone mRNAs, while participating in RNA surveillance to prevent translation of aberrant transcripts 2. DIS3L also regulates microRNA stability by degrading miRNAs bearing oligoadenylated 3' tails added by PAPD5; this regulation controls miRNA levels affecting p53 translation 3. Additionally, DIS3L participates in degrading Y RNAs when they acquire oligoadenylation marks 4. Functionally, DIS3L exhibits genetic interactions with genes involved in RNA processing, splicing, and export, revealing its integration within broader cellular RNA metabolism networks 5. Disease relevance includes association with refractive error susceptibility 6 and roles in medulloblastoma development where DIS3L is required for human medulloblastoma cell growth 7. Mutations in DIS3L are associated with human diseases related to exoribonuclease dysfunction 2. However, DIS3L loss in the epididymal initial segment is dispensable for normal spermatogenesis and male fertility 8, suggesting context-dependent essentiality.