LDB3 (LIM domain binding 3) is a cytoskeletal adapter protein primarily localized to the Z-disk of striated muscle that couples protein kinase C signaling to the cytoskeleton through its LIM domains [UniProt]. The protein interacts with key sarcomeric components including muscle α-actinin and actin, regulating actin cytoskeleton organization and muscle structure development [GO Annotations]. LDB3 mutations cause multiple forms of inherited muscle disease. It is associated with myofibrillar myopathy, characterized by Z-disk disintegration and myofibrillar dissolution 1, and has been identified among approximately 20 genes causing autosomal dominant distal myopathy, a progressive primary muscle disorder with prominent distal weakness 2. LDB3 variants also cause familial dilated cardiomyopathy with or without left ventricular non-compaction (LVNC), a genetically heterogeneous condition where sarcomeric gene mutations correlate with disease severity 3. Beyond skeletal muscle disease, recent evidence indicates LDB3 plays a broader role in cardiovascular health. LDB3 was identified as a hub gene in Stanford type A aortic dissection, a life-threatening vascular condition, with LDB3 predominantly expressed in vascular smooth muscle cells 4. Disease-associated LDB3 single nucleotide polymorphisms in the UK Biobank associated with aortic aneurysm and dissection, and LDB3 expression was reduced in diseased aortic tissues, suggesting its importance in maintaining vascular structural integrity.