Human Molecular Genetics, Vol 8, 855-861, Copyright © 1999 by Oxford University Press
LV Anderson, K Davison, JA Moss, C Young, MJ Cullen, J Walsh, MA Johnson, R Bashir, S Britton, S Keers, Z Argov, I Mahjneh, F Fougerousse, JS Beckmann and KM Bushby
Recently, a single gene, DYSF, has been identified which is mutated in
patients with limb-girdle muscular dystrophy type 2B (LGMD2B) and with
Miyoshi myopathy (MM). This is of interest because these diseases have been
considered as two distinct clinical conditions since different muscle
groups are the initial targets. Dysferlin, the protein product of the gene,
is a novel molecule without homology to any known mammalian protein. We
have now raised a monoclonal antibody to dysferlin and report on the
expression of this new protein: immunolabelling with the antibody
(designated NCL-hamlet) demonstrated a polypeptide of approximately 230 kDa
on western blots of skeletal muscle, with localization to the muscle fibre
membrane by microscopy at both the light and electron microscopic level. A
specific loss of dysferlin labelling was observed in patients with
mutations in the LGMD2B/MM gene. Furthermore, patients with two different
frameshifting mutations demonstrated very low levels of immunoreactive
protein in a manner reminiscent of the dystrophin expressed in many
Duchenne patients. Analysis of human fetal tissue showed that dysferlin was
expressed at the earliest stages of development examined, at Carnegie stage
15 or 16 (embryonic age 5-6 weeks). Dysferlin is present, therefore, at a
time when the limbs start to show regional differentiation. Lack of
dysferlin at this critical time may contribute to the pattern of muscle
involvement that develops later, with the onset of a muscular dystrophy
primarily affecting proximal or distal muscles.
ARTICLES
Dysferlin is a plasma membrane protein and is expressed early in human development [published erratum appears in Hum Mol Genet 1999 Jun;8(6):1141]
Neurobiology Department, University Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK. l.v.b.anderson@ncl.ac.uk
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