UNC45A (unc-45 myosin chaperone A) functions as a specialized co-chaperone that regulates myosin folding and cellular organization through multiple mechanisms. The protein acts as a myosin-specific chaperone, with myosin VB and myosin 1b identified as key client proteins essential for intestinal epithelial morphogenesis 12. UNC45A prevents myosin aggregation and supports proper nonmuscle myosin II filament formation, facilitating intracellular trafficking and recycling processes 3. The protein also localizes to centrosomes where it regulates ChK1 activation and nuclear-cytoplasmic localization, controlling cell proliferation and proper centrosome function 4. Loss-of-function mutations in UNC45A cause osteo-oto-hepato-enteric (O2HE) syndrome, characterized by severe congenital diarrhea, cholestasis, bone fragility, and hearing loss 15. The intestinal pathology resembles microvillus inclusion disease, with patients displaying abnormal epithelial morphogenesis, microvillus inclusions, and impaired apical trafficking due to defective myosin VB function 6. Additionally, UNC45A protein levels are decreased in colorectal cancer through miRNA-mediated regulation, suggesting potential tumor suppressor functions 7. The protein's dual roles in myosin chaperoning and cell cycle regulation make it critical for both normal development and disease pathogenesis.