LAMA2 and Bethlem myopathy: In particular, mutations in the LAMA2 gene coding for the laminin α2 chain cause LAMA2-related muscular dystrophy, while mutations in the COL6A1, COL6A2, and COL6A3 genes lead to collagen VI-related myopathies, including Bethlem myopathy and Ullrich congenital muscular dystrophy (Pegoraro et al., 2000; Allamand and Guicheney, 2002; Lampe and Bushby, 2005; Bonnemann, 2011).