title: Sub-cellular localisation of fukutin related protein in different cell lines and in the muscle of patients with MDC1C and LGMD2I.
abstract: MDC1C and LGMD2I are two allelic forms of muscular dystrophies caused by mutations in the gene encoding for fukutin related protein (FKRP). FKRP encodes for a putative glycosyltransferase, the precise function of which is unknown. However, the marked reduction of alpha-dystroglycan glycosylation in the muscle of MDC1C and LGMD2I patients suggests a role for FKRP in dystroglycan processing. Using a polyclonal antibody raised against FKRP we now show that endogenous FKRP locates to the Golgi apparatus of neuronal, oligodendroglial, and the cardiac muscle cell line H9c2. In differentiated C2C12 myotubes and in transverse sections of normal skeletal and cardiac muscle, endogenous FKRP surrounded the myonuclei. This localisation was unaffected in the skeletal muscle of patients with MDC1C and LGMD2I carrying various FKRP mutations. These observations imply a specific role for FKRP during striated muscle, neuronal and glial development and suggest that protein mis-localisation is not a common mechanism of disease in FKRP-related dystrophies.
authors.affiliation: Dubowitz Neuromuscular Unit, Department of Paediatrics, Imperial College London, Hammersmith Campus, UK.
authors.forename: Silvia
authors.initials: S
authors.lastname: Torelli
authors.forename: Susan C
authors.initials: SC
authors.lastname: Brown
authors.forename: Martin
authors.initials: M
authors.lastname: Brockington
authors.forename: Nazanin F
authors.initials: NF
authors.lastname: Dolatshad
authors.forename: Cecilia
authors.initials: C
authors.lastname: Jimenez
authors.forename: Leigh
authors.initials: L
authors.lastname: Skordis
authors.forename: Lucy H
authors.initials: LH
authors.lastname: Feng
authors.forename: Luciano
authors.initials: L
authors.lastname: Merlini
authors.forename: David Hilton
authors.initials: DH
authors.lastname: Jones
authors.forename: Norma
authors.initials: N
authors.lastname: Romero
authors.forename: Ulla
authors.initials: U
authors.lastname: Wewer
authors.forename: Thomas
authors.initials: T
authors.lastname: Voit
authors.forename: Caroline A
authors.initials: CA
authors.lastname: Sewry
authors.forename: Satoru
authors.initials: S
authors.lastname: Noguchi
authors.forename: Ichizo
authors.initials: I
authors.lastname: Nishino
authors.forename: Francesco
authors.initials: F
authors.lastname: Muntoni
mesh_terms: D000818:Animals; D001324:Autoantigens; D015153:Blotting, Western / Q000379:methods; D002460:Cell Line; D003893:Desmin / Q000378:metabolism; D005333:Fetus; D006056:Golgi Apparatus / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D018482:Muscle, Skeletal / Q000473:pathology*; D009136:Muscular Dystrophies / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D009154:Mutation; D032446:Myoblasts / Q000378:metabolism / Q000473:pathology; D009447:Neuroblastoma; D009474:Neurons / Q000378:metabolism / Q000473:pathology*; D010430:Pentosyltransferases; D011506:Proteins / Q000378:metabolism*; D051381:Rats; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D001324:Autoantigens; D003893:Desmin; C097741:Golgin subfamily A member 2; D008565:Membrane Proteins; D011506:Proteins; C443107:FKRP protein, human; D010430:Pentosyltransferases