KBTBD6 functions as a substrate adapter protein within the CUL3-RING E3 ubiquitin ligase complex, mediating the ubiquitination and proteasomal degradation of key regulatory proteins 1. The primary characterized function involves targeting TIAM1, a RAC1-specific guanine exchange factor, for Lys-48-linked ubiquitination and degradation, thereby regulating RAC1 signaling pathways that control cytoskeletal organization, cell migration, and proliferation 1. This process requires interaction with GABARAP proteins, which spatially restrict the ligase activity to membrane-associated compartments 1. KBTBD6 also functions in dopamine receptor regulation, where it targets DRD2 for ubiquitination and degradation at multiple lysine residues, affecting dopamine agonist sensitivity in pituitary adenomas 2. Recent genome-wide association studies have identified KBTBD6 as a novel regulator of telomere length, with overexpression leading to telomere lengthening 3. Additionally, KBTBD6 shows tissue-specific imprinting in livestock species but not in humans or mice, suggesting species-specific regulatory evolution 4. The gene has been implicated in various pathological conditions including atherosclerosis 5 and intracranial aneurysms 6, highlighting its broad physiological importance.