Document Detail


Oculopharyngeal muscular dystrophy: phenotypic and genotypic studies in a UK population.
MedLine Citation:
PMID:  11222452     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Oculopharyngeal muscular dystrophy (OPMD) is an autosomal dominant disorder of late onset that commonly presents with ptosis and dysphagia. The genetic basis of the condition has been identified recently as a stable trinucleotide repeat expansion in exon 1 of the poly(A) binding protein 2 gene (PABP2), in which (GCG)(6) is the normal repeat length. The prevalence of OPMD is greatest in patients of French-Canadian origin. It is not clear if expansion repeat length is a reliable test in other populations. In this study, we analysed the phenotypic and genotypic characteristics of 31 patients with OPMD in the UK. Ptosis was the first reported symptom in two-thirds of the patients, and half of the subjects studied had evidence of ophthalmoplegia. All but one family had a pathological expansion in the PABP2 gene, ranging from (GCG)(8) to (GCG)(13). In contrast to the French-Canadian population, (GCG)(10) was almost as common as (GCG)(9), evidence against a strong founder effect in the UK population. There was a weak association between repeat length and age of disease onset. Patients with longer repeat lengths, such as (GCG)(13), developed severe limb weakness early in the disease. We were unable to detect the (GCG)(7) polymorphism in over 200 normal controls, suggesting that the frequency of this expansion is lower than that found in the French-Canadian population. One family was negative for the expansion. Affected members presented with the classical features of OPMD, namely ptosis, dysphagia and cytoplasmic inclusions on muscle biopsy, although with some atypical features, such as early age of onset, high serum levels of creatine kinase and a profound ophthalmoplegia. This family is an example of a GCG expansion-negative oculopharyngeal syndrome requiring further genetic investigation. We conclude that PABP2 analysis is a reliable non-invasive diagnostic test for OPMD in the UK population.
Authors:
M E Hill; G A Creed; T F McMullan; A G Tyers; D Hilton-Jones; D O Robinson; S R Hammans
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain : a journal of neurology     Volume:  124     ISSN:  0006-8950     ISO Abbreviation:  Brain     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2001-03-06     Completed Date:  2001-04-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372537     Medline TA:  Brain     Country:  England    
Other Details:
Languages:  eng     Pagination:  522-6     Citation Subset:  AIM; IM    
Affiliation:
Wessex Neurology Centre, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Aged
DNA Mutational Analysis
Female
Genotype
Great Britain
Humans
Male
Middle Aged
Muscular Dystrophies / genetics*
Phenotype
Poly(A)-Binding Proteins
RNA-Binding Proteins / genetics
Trinucleotide Repeat Expansion / genetics
Chemical
Reg. No./Substance:
0/Poly(A)-Binding Proteins; 0/RNA-Binding Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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