This chapter reviews the most common forms of congenital muscular dystrophies, including laminin α-2 (merosin) deficiency, Ullrich congenital muscular dystrophy, fukutin-related proteinopathy, rigid spine syndrome, and glycosylation disorders of α-dystroglycan.
Skin abnormalities, including predisposition to keratosis pilaris and abnormal scarring, were described in Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM) patients carrying mutations in COL6A1, COL6A2, and COL6A3 genes, whereas COL6A5, previously designated as COL29A1, was linked to atopic dermatitis.
Collagen VI microfibril formation is abolished by an {alpha}2(VI) von Willebrand factor type A domain mutation in a patient with Ullrich congenital muscular dystrophy.
In this study, we evaluated the effects of NMD inhibition by siRNA-mediated knockdown of SMG-1 or Upf1 on the phenotype of Ullrich disease, an autosomal recessive congenital muscular dystrophy.
In this study, we evaluated the effects of NMD inhibition by siRNA-mediated knockdown of SMG-1 or Upf1 on the phenotype of Ullrich disease, an autosomal recessive congenital muscular dystrophy.
MCSP/NG2 proteoglycan may be considered an important receptor mediating COL6-sarcolemma interactions, a relationship that is disrupted by the pathogenesis of UCMD muscle.
MCSP/NG2 proteoglycan may be considered an important receptor mediating COL6-sarcolemma interactions, a relationship that is disrupted by the pathogenesis of UCMD muscle.
MCSP/NG2 proteoglycan may be considered an important receptor mediating COL6-sarcolemma interactions, a relationship that is disrupted by the pathogenesis of UCMD muscle.
Eleven and 7 cases, respectively, of phenotypically suspected Ullrich congenital muscular dystrophy and dystrophinopathy underwent simultaneous skin and muscle biopsies, which were subjected to hematoxylin and eosin (H&E) and immunohistochemistry staining for collagen VI and dystrophin 1, 2, and 3.
Recently we found a marked reduction of fibronectin receptors in the skin and cultured fibroblasts of two patients with Ullrich's disease with collagen VI deficiency, and speculated that an abnormality of cell adhesion may be involved in the pathogenesis of the disease.
These results suggest that collagen VI deficiency may lead to the reduction of fibronectin receptors and that an abnormality of cell adhesion may be involved in the pathogenesis of Ullrich's disease.
In vivo, ColVI deficiency causes fragmentation of acetylcholine receptor (AChR) clusters, with abnormal expression of NMJ-enriched proteins and re-expression of fetal AChRγ subunit, both in Col6a1 null mice and in patients affected by Ullrich congenital muscular dystrophy (UCMD), the most severe form of ColVI-related myopathies.
Based on genetic analysis, five patients (five families) comprising four with IM and one with typical UCMD had missense mutations in the triple-helical domain of COL6A1, and ten patients (four families) with BM showed exon-14-skipping mutations.
Collagen VI myopathies are genetic disorders caused by mutations in collagen 6 A1, A2 and A3 genes, ranging from the severe Ullrich congenital muscular dystrophy to the milder Bethlem myopathy, which is recapitulated by collagen-VI-null (Col6a1(-/-)) mice.
Ullrich congenital muscular dystrophy (UCMD) is caused by mutations in either COL6A1, COL6A2 or COL6A3 gene, thereby leading to collagen VI deficiency in the ECM.
Characterization of a rare case of Ullrich congenital muscular dystrophy due to truncating mutations within the COL6A1 gene C-terminal domain: a case report.
Position of glycine substitutions in the triple helix of COL6A1, COL6A2, and COL6A3 is correlated with severity and mode of inheritance in collagen VI myopathies.