RGPD2 (RANBP2 like and GRIP domain containing 2) is a nuclear transport-associated protein with predicted SUMO transferase activity and roles in nucleocytoplasmic trafficking. Based on its structural homology to RANBP2, RGPD2 likely participates in NLS-bearing protein import into nucleus and nuclear export processes [GO annotations]. The gene is differentially expressed in colorectal carcinoma cells, with upregulation observed following sporamin treatment combined with thapsigargin, suggesting involvement in cellular stress responses and metal ion homeostasis 1. RGPD2 and its paralog RGPD4 are implicated in congenital pouch colon pathogenesis, where they contribute to GTPase activator activity and demonstrate differential expression patterns associated with bowel/colon development 2. In the context of smoking-induced lung tumorigenesis, DNA methylation at the RGPD1/RGPD2 locus (cg26563141) shows significant associations with telomere length and lung cancer risk, with hypermethylation correlating to reduced RGPD2 expression across blood and tissue samples 3. The epigenetic regulation of RGPD2 appears to mediate approximately 2.89% of smoking's effect on lung cancer risk through telomere homeostasis mechanisms. Clinical significance remains preliminary, requiring functional validation and larger cohort studies to establish RGPD2's precise mechanistic roles in carcinogenesis and developmental pathology.