Ullrich congenital muscular dystrophy (UCMD), Bethlem myopathy (BM), and myosclerosis myopathy (MM) are diseases caused by mutations in each of the three genes (COL6A1, COL6A2, and COL6A3) encoding the extracellular matrix protein collagen VI. This evidence concerns the gene COL6A1 and Congenital muscular dystrophy, Ullrich type.