KANK4 is a cytoplasmic protein containing KN motifs and ankyrin repeats that regulates actin polymerization and cell motility. Structurally, KANK4 belongs to an evolutionarily conserved family (KANK1-4) characterized by N-terminal coiled-coil motifs and C-terminal ankyrin repeats 1. The protein localizes to focal adhesions in contractile cells such as smooth muscle and pericytes, where it modulates integrin-mediated adhesion and actomyosin contractility through RHO GTPase signaling 2. KANK4 negatively regulates RHO pathway activity to control cell contractility 3. Clinically, KANK4 dysfunction is implicated in multiple diseases. Recessive mutations cause nephrotic syndrome through disruption of podocyte filtration function 4. Rare variants associate with bipolar disorder susceptibility 5. In cancer pathology, DHCR7-mediated upregulation of KANK4 activates PI3K/AKT signaling to promote lymph node metastasis in cervical cancer 6. Additionally, exclusive KANK4 expression in keloid myofibroblasts enhances cell mobility, contributing to abnormal wound healing pathology 7. KANK4 emerges as a multifunctional regulator linking cytoskeletal dynamics to diverse pathological processes through tissue-specific expression patterns.