Telethonin

Telethonin, also known as TCAP, is a protein that in humans is encoded by the TCAP gene. It is a crucial component of the Z-disc in muscle cells, where it interacts with titin and actin to maintain the structural integrity of the muscle. Mutations in the TCAP gene can lead to various forms of muscular dystrophy.

Function

Telethonin is a 19 kDa protein that is predominantly expressed in striated muscle. It is located at the Z-disc of the sarcomere, where it binds to the titin protein. This interaction is crucial for the assembly and stability of the sarcomere structure. Telethonin also interacts with myopalladin, a protein that links the sarcomeric Z-disc to the myofibril.

Clinical significance

Mutations in the TCAP gene can cause different forms of muscular dystrophy, including limb-girdle muscular dystrophy type 2G and idiopathic dilated cardiomyopathy. These conditions are characterized by progressive weakness and wasting of the skeletal muscles. In the case of idiopathic dilated cardiomyopathy, the heart muscle is also affected, leading to heart failure.

Research

Research on telethonin has focused on understanding its role in muscle function and disease. Studies have shown that telethonin is crucial for the assembly and stability of the sarcomere, the basic unit of muscle contraction. Other research has investigated the effects of TCAP gene mutations on muscle function and disease progression.

See also

• Z-disc
• Titin
• Actin
• Muscular dystrophy
• Limb-girdle muscular dystrophy
• Idiopathic dilated cardiomyopathy