Dystrophin-associated protein (DAP)

The **dystrophin-associated protein** (DAP) or **dystrophin-associated protein complex** is not a single protein but a large multi-subunit complex primarily found in the muscle cell membrane (sarcolemma), where it forms the core of the costamere structure[5][2][1]. The complex physically links the cytoskeleton inside muscle cells (notably actin filaments) with the extracellular matrix, primarily through interactions with laminin, via a consortium of proteins including dystrophin, dystroglycans, sarcoglycans, syntrophins, dystrobrevin, and sarcospan[1][5][4][6][7]. This linkage is essential for mechanical stability of muscle fibers during contraction and also has roles in cellular signaling and regulation of blood flow[1][2][5]. Mutations in various components of the complex result in different forms of muscular dystrophy, notably Duchenne muscular dystrophy (DMD), due to the loss of effective cytoskeletal-extracellular matrix coupling[2][6][4]. The dystrophin-associated protein complex is not itself a drug target, but a structural and functional assembly critical for muscle integrity. Efforts in DMD therapy focus on restoring dystrophin or stabilizing the complex, sometimes indirectly implicating these components as therapeutic interest points; however, "dystrophin-associated protein" as a generic term is not a single therapeutic target[4][1][5].

Other names

Dystrophin-associated protein complexDystrophin-glycoprotein complexDystrophin-associated glycoprotein complexDGCDAPC