title: Mutations in the human LARGE gene cause MDC1D, a novel form of congenital muscular dystrophy with severe mental retardation and abnormal glycosylation of alpha-dystroglycan.
abstract: The congenital muscular dystrophies (CMD) are a heterogeneous group of autosomal recessive disorders. A new pathomechanism has recently been identified in a group of these disorders in which known or putative glycosyltransferases are defective. Common to all these conditions is the hypoglycosylation of alpha-dystroglycan. Fukuyama CMD, muscle-eye-brain disease and Walker-Warburg syndrome, each associated with eye abnormalities and neuronal migration defects, result from mutations in fukutin, POMGnT1 and POMT1, respectively, while mutations in the fukutin-related protein (FKRP) gene cause congenital muscular dystrophy 1C, typically lacking brain involvement. Another putative glycosyltransferase, Large, is mutated in the myodystrophy mouse. The human homologue of this gene is therefore a strong candidate for involvement in novel forms of muscular dystrophy. We studied 36 patients with muscular dystrophy and either mental retardation, structural brain changes or abnormal alpha-dystroglycan immunolabelling, unlinked to any reported CMD loci. Linkage analysis in seven informative families excluded involvement of LARGE but sequencing of this gene in the remaining 29 families identified one patient with a G1525A (Glu509Lys) missense mutation and a 1 bp insertion, 1999insT. This 17-year-old girl presented with congenital muscular dystrophy, profound mental retardation, white matter changes and subtle structural abnormalities on brain MRI. Her skeletal muscle biopsy showed reduced immunolabelling of alpha-dystroglycan. Immunoblotting with an antibody to a glycosylated epitope demonstrated a reduced molecular weight form of alpha-dystroglycan that retained some laminin binding activity. This is the first description of mutations in the human LARGE gene and we propose to name this new disorder MDC1D.
authors.affiliation: Dubowitz Neuromuscular Centre, Imperial College, Hammersmith Campus, London, UK.
authors.forename: Cheryl
authors.initials: C
authors.lastname: Longman
authors.forename: Martin
authors.initials: M
authors.lastname: Brockington
authors.forename: Silvia
authors.initials: S
authors.lastname: Torelli
authors.forename: Cecilia
authors.initials: C
authors.lastname: Jimenez-Mallebrera
authors.forename: Colin
authors.initials: C
authors.lastname: Kennedy
authors.forename: Nofal
authors.initials: N
authors.lastname: Khalil
authors.forename: Lucy
authors.initials: L
authors.lastname: Feng
authors.forename: Ravindra K
authors.initials: RK
authors.lastname: Saran
authors.forename: Thomas
authors.initials: T
authors.lastname: Voit
authors.forename: Luciano
authors.initials: L
authors.lastname: Merlini
authors.forename: Caroline A
authors.initials: CA
authors.lastname: Sewry
authors.forename: Susan C
authors.initials: SC
authors.lastname: Brown
authors.forename: Francesco
authors.initials: F
authors.lastname: Muntoni
mesh_terms: D000293:Adolescent; D002874:Chromosome Mapping; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D049030:Dystroglycans; D005260:Female; D006031:Glycosylation; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics* / Q000378:metabolism; D007797:Laminin / Q000378:metabolism; D008279:Magnetic Resonance Imaging; D008562:Membrane Glycoproteins / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000378:metabolism*; D009136:Muscular Dystrophies / Q000235:genetics* / Q000378:metabolism; D009154:Mutation
chemical_list: D003598:Cytoskeletal Proteins; C483081:DAG1 protein, human; D007797:Laminin; D008562:Membrane Glycoproteins; C102645:laminin alpha 2; D049030:Dystroglycans