COL6A1 and Ullrich congenital muscular dystrophy: Other congenital muscular dystrophies such as merosin-deficient congenital muscular dystrophy type 1A (LAMA2 deficiency) or Ullrich congenital muscular dystrophy (mutations in COL6A1, 2 or 3) are also characterized by muscle degeneration and fibrosis accumulation [103–105].