Myotilin (MYOT)

Striated muscle sarcomeres are highly organized structures composed of actin (thin) and myosin (thick) filaments that slide past each other during contraction. The integrity of sarcomeres is controlled by a set of structural proteins, among which are titin (TTN), a giant molecule that contains several immunoglobulin (Ig)-like domains and associates with thin and thick filaments, and alpha-actinin (ACTN1), an actin cross-linking protein. Mutations in several sarcomeric and sarcolemmal proteins have been shown to result in muscular dystrophy and cardiomyopathy.

Myotilin (myofibrillar titin-like protein) also known as TTID (TiTin Immunoglobulin Domain) is a skeletal muscle protein that is found within the Z-disc of sarcomeres. It is mutated in various forms of muscular dystrophy: