EHD4 is an ATP- and membrane-binding protein that regulates membrane reorganization through ATP hydrolysis and plays a central role in endocytic recycling and cell migration. EHD4 localizes to recycling endosomes and early endosomes, where it functions in endosomal transport 12. During sprouting angiogenesis, EHD4 forms a specialized complex with PACSIN2 and MICAL-L1 at asymmetric adherens junctions, creating recycling endosome-like tubular structures that control VE-cadherin trafficking and coordinate collective endothelial cell migration 3. EHD4 interacts with cadherin proteins including CDH23 in cochlear hair cells, with this interaction being calcium-sensitive and potentially regulating cadherin trafficking 4. Beyond vascular biology, EHD4 has emerged as a disease-associated biomarker: it was identified in diagnostic panels for Alzheimer's disease and mild cognitive impairment 5, pancreatic endothelial cell specialization 6, and colorectal cancer lymph node metastasis 7. Additionally, EHD4 expression is regulated in tumor immunity contexts and associates with disease progression markers 8. The protein's tissue-specific expression in heart and pancreas 9 suggests specialized functions in these tissues, though its precise roles in disease pathogenesis require further investigation.