title: Ultrastructural changes in LGMD1F.
abstract: A large Italo-Spanish kindred with autosomal-dominant inheritance has been reported with proximal limb and axial muscle weakness. Clinical, histological and genetic features have been described. A limb girdle muscular dystrophy 1F (LGMD1F) disease locus at chromosome 7q32.1-32.2 has been previously identified. We report a muscle pathological study of two patients (mother and daughter) from this family. Muscle morphologic findings showed increased fiber size variability, fiber atrophy, and acid-phosphatase-positive vacuoles. Immunofluorescence against desmin, myotilin, p62 and LC3 showed accumulation of myofibrils, ubiquitin binding protein aggregates and autophagosomes. The ultrastructural study confirmed autophagosomal vacuoles. Many alterations of myofibrillar component were detected, such as prominent disarray, rod-like structures with granular aspect, and occasionally, cytoplasmic bodies. Our ultrastructural data and muscle pathological features are peculiar to LGMD1F and support the hypothesis that the genetic defect leads to a myopathy phenotype associated with disarrangement of the cytoskeletal network.
authors.affiliation: Department of Biomedical and Neuromotor Sciences, Alma Mater University of Bologna, Bologna, Italy. giovanna.cenacchi@unibo.it
authors.forename: Giovanna
authors.initials: G
authors.lastname: Cenacchi
authors.forename: Enrico
authors.initials: E
authors.lastname: Peterle
authors.forename: Marina
authors.initials: M
authors.lastname: Fanin
authors.forename: Valentina
authors.initials: V
authors.lastname: Papa
authors.forename: Roberta
authors.initials: R
authors.lastname: Salaroli
authors.forename: Corrado
authors.initials: C
authors.lastname: Angelini
mesh_terms: D017668:Age of Onset; D002648:Child; D003599:Cytoskeleton / Q000473:pathology / Q000648:ultrastructure; D018450:Disease Progression; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D046529:Microscopy, Electron, Transmission; D018482:Muscle, Skeletal / Q000473:pathology* / Q000648:ultrastructure; D049288:Muscular Dystrophies, Limb-Girdle / Q000473:pathology*; D009210:Myofibrils / Q000473:pathology; D010641:Phenotype