COL6A6 and Ullrich congenital muscular dystrophy: Mutations of the COL6A1-COL6A6 genes, encoding COL6 subunits, are known to be causative for a distinct subtype of congenital muscular dystrophies, including Bethlem myopathy (BM) and Ullrich congenital muscular dystrophy (UCMD) (Jöbsis et al., 1996; Camacho Vanegas et al., 2001; Merlini et al., 2008).