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CASE REPORTS
CLINICAL TRIAL
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Atypical phenotypes in patients with facioscapulohumeral muscular dystrophy 4q35 deletion.
Archives of Neurology 2003 October
BACKGROUND: Facioscapulohumeral muscular dystrophy (FSHD) is associated with a deletion on chromosome 4q35. Recent studies have shown that this deletion is found in patients with other phenotypes in addition to those with the classic Landouzy-Dejerine FSHD phenotype.
OBJECTIVE: To examine patients with atypical phenotypes and an FSHD deletion on chromosome 4q35.
DESIGN: Clinical characterization and genotype-phenotype correlation.
SETTING: University hospital.
PATIENTS: Forty-one symptomatic subjects with deletions on chromosome 4q35.
RESULTS: We found 6 patients with atypical FSHD. Three (from a single family with FSHD) had additional symptoms of chronic progressive external ophthalmoplegia (4q35 EcoRI/BlnI fragment size, 20 kilobase [kb]), and 3 patients (1 with sporadic disease and 2 from a single family) had facial-sparing scapulohumeral dystrophy (4q35 EcoRI/BlnI fragment size, 30 and 34 kb, respectively).
CONCLUSIONS: The clinical presentations in patients with FSHD-associated short fragments on chromosome 4q35 are not restricted to the classic FSHD form, but constitute a variety of clinical manifestations. There seems to be no clear correlation between the atypical subtype and the DNA fragment size due to the deletion.
OBJECTIVE: To examine patients with atypical phenotypes and an FSHD deletion on chromosome 4q35.
DESIGN: Clinical characterization and genotype-phenotype correlation.
SETTING: University hospital.
PATIENTS: Forty-one symptomatic subjects with deletions on chromosome 4q35.
RESULTS: We found 6 patients with atypical FSHD. Three (from a single family with FSHD) had additional symptoms of chronic progressive external ophthalmoplegia (4q35 EcoRI/BlnI fragment size, 20 kilobase [kb]), and 3 patients (1 with sporadic disease and 2 from a single family) had facial-sparing scapulohumeral dystrophy (4q35 EcoRI/BlnI fragment size, 30 and 34 kb, respectively).
CONCLUSIONS: The clinical presentations in patients with FSHD-associated short fragments on chromosome 4q35 are not restricted to the classic FSHD form, but constitute a variety of clinical manifestations. There seems to be no clear correlation between the atypical subtype and the DNA fragment size due to the deletion.
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