Desmin (DES) is a muscle-specific type III intermediate filament protein that serves as the structural backbone of muscle fibers. Its primary function is maintaining sarcomeric architecture by interconnecting Z-disks and forming myofibrillar networks that link myofibrils to the sarcolemmal cytoskeleton, nucleus, and mitochondria, thereby providing mechanical strength during muscle contraction [UniProt:25358400]. In adult striated muscle, desmin creates a fibrous network connecting myofibrils to each other and the plasma membrane from Z-line peripheries [UniProt:24200904, UniProt:25394388, UniProt:26724190]. Mechanistically, desmin associates with detyrosinated tubulin-alpha chains to anchor sarcomeric microtubules, generating buckled structures that provide mechanical resistance during contraction. Additionally, desmin maintains nuclear membrane integrity by anchoring at the nuclear envelope, thereby preserving intracellular mechanical forces. Desmin also regulates transcriptional control of NKX2-5 in cardiac progenitor cells during cardiomyogenesis and maintains optimal conformation of nebulette for cardiac alpha-actin recruitment. Disease relevance: DES mutations cause dilated cardiomyopathy (1I), myofibrillar myopathy (1), and neurogenic scapuloperoneal syndrome (Kaeser type), reflecting desmin's critical role in maintaining muscular integrity and function. These associations underscore desmin's essential contribution to both skeletal and cardiac muscle homeostasis.