LSG1 is a conserved GTPase essential for 60S ribosomal subunit maturation and cytoplasmic export 1. Its primary function involves mediating NMD3 release from the pre-60S subunit after nuclear export, facilitating proper ribosome assembly 2. Beyond ribosome biogenesis, LSG1 localizes to the endoplasmic reticulum where it tethers 60S subunits and regulates translation of select proteins 3. LSG1 interacts with VAP proteins through a noncanonical FFAT-like motif, enabling its ER localization independent of its GTPase function 4. LSG1 inhibition triggers cellular senescence not through ribosomal depletion but via endoplasmic reticulum homeostasis disruption and cholesterol biosynthesis pathway upregulation 2. The GTPase domain and acidic domain are functionally critical, as demonstrated in Drosophila studies showing LSG1 ortholog NS3 regulates neuroblast proliferation and cell polarity 5. LSG1's evolutionary expansion correlates with eukaryotic compartmentalization, with members localized to ER, nucleus, and other organelles 1. Dysregulation of LSG1 or related lncRNA (Lnc-LSG1) may contribute to renal cell carcinoma metastasis 6, suggesting LSG1 inhibition could have therapeutic potential in cancer management.