PDLIM5 (PDZ and LIM domain 5) is a cytoskeletal scaffolding protein critical for cardiac function and structure. As a Z-disk-associated protein, PDLIM5 functions primarily through its PDZ domain to bind cytoskeletal and membrane proteins, while its LIM domains interact with signaling molecules including protein kinase C 1. In the heart, PDLIM5 regulates cardiomyocyte contractility through alternative splicing regulation and proper isoform expression; abnormal Pdlim5 isoform accumulation disrupts cardiomyocyte cytokinesis and causes congenital cardiovascular defects 2. PDLIM5 is involved in sarcomere structure and function, with RBPMS regulating its mRNA splicing to generate functionally distinct protein isoforms 3. Disease relevance is substantial: polymorphisms in PDLIM5 increase risk for idiopathic dilated cardiomyopathy (IDCM) and are associated with alcohol dependence, type 2 diabetes, and hypertension 45. Additionally, PDLIM5 participates in immune regulation by promoting Stat3 degradation in tumor-infiltrating regulatory T cells 6. Beyond cardiology, PDLIM5 contributes to dendritic spine morphogenesis and synaptic regulation in neurons. These diverse roles establish PDLIM5 as a multifunctional cytoskeletal adaptor with significant clinical implications for cardiovascular and metabolic diseases.