Mobility shift of beta-dystroglycan as a marker of GMPPB gene-related muscular dystrophy.
J Neurol Neurosurg Psychiatry
; 89(7): 762-768, 2018 07.
Article
em En
| MEDLINE
| ID: mdl-29437916
ABSTRACT
BACKGROUND:
Defects in glycosylation of alpha-dystroglycan (α-DG) cause autosomal-recessive disorders with wide clinical and genetic heterogeneity, with phenotypes ranging from congenital muscular dystrophies to milder limb girdle muscular dystrophies. Patients show variable reduction of immunoreactivity to antibodies specific for glycoepitopes of α-DG on a muscle biopsy. Recessive mutations in 18 genes, including guanosine diphosphate mannose pyrophosphorylase B (GMPPB), have been reported to date. With no specific clinical and pathological handles, diagnosis requires parallel or sequential analysis of all known genes.METHODS:
We describe clinical, genetic and biochemical findings of 21 patients with GMPPB-associated dystroglycanopathy.RESULTS:
We report eight novel mutations and further expand current knowledge on clinical and muscle MRI features of this condition. In addition, we report a consistent shift in the mobility of beta-dystroglycan (ß-DG) on Western blot analysis of all patients analysed by this mean. This was only observed in patients with GMPPB in our large dystroglycanopathy cohort. We further demonstrate that this mobility shift in patients with GMPPB was due to abnormal N-linked glycosylation of ß-DG.CONCLUSIONS:
Our data demonstrate that a change in ß-DG electrophoretic mobility in patients with dystroglycanopathy is a distinctive marker of the molecular defect in GMPPB.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Distroglicanas
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Guanosina Difosfato Manose
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Distrofias Musculares
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Mutação
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Nucleotidiltransferases
Tipo de estudo:
Etiology_studies
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Incidence_studies
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Observational_studies
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Risk_factors_studies
Limite:
Adolescent
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Aged
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Child
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Child, preschool
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
J Neurol Neurosurg Psychiatry
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Reino Unido