COL6A3 and Congenital muscular dystrophy, Ullrich type: For example, collagen type VI myopathies which are caused by mutations in one of three collagen-VI genes, namely COL6A1, COL6A2, and COL6A3, are associated with several disorders, including more severe Ullrich congenital muscular dystrophy (UCMD) (OMIM #254090) and mild to moderate Bethlem myopathy (BM) (OMIM #158810) [3,4,5].