ADAMTS20 is a secreted zinc metalloendopeptidase belonging to the ADAMTS superfamily that plays critical roles in extracellular matrix remodeling and developmental processes 1. Beyond its canonical proteolytic function, ADAMTS20 has non-canonical intracellular roles: it is internalized via endocytosis and localizes to Rab11 vesicles to regulate primary cilium biogenesis through proteolytic mechanisms 2. ADAMTS20 also cleaves membrane type 1-matrix metalloproteinase (MT1-MMP) at specific sites, regulating cell surface protease activity and focal adhesion dynamics 3. During development, ADAMTS20 is essential for melanoblast survival in dermal tissues, where it facilitates Kit ligand signaling and processes the proteoglycan versican 4. Loss-of-function mutations cause craniofacial birth defects including cleft lip and palate, identified through genome-wide association studies in both canine and human populations 5. In breast invasive ductal carcinoma, ADAMTS20 expression is significantly reduced compared to normal tissue, suggesting potential tumor-suppressive functions 6. These findings establish ADAMTS20 as a multifunctional protease with essential roles spanning embryonic development, ciliary biology, and potentially cancer biology.