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Clinical heterogeneity in dysferlinopathy
Hidetsugu Ueyama1, Toshihide Kumamoto, Hideo Horinouchi
1Third Department of Internal Medicine, Oita Medical University.
Internal Medicine (Tokyo, Japan)
|July 23, 2002
Summary
Dysferlinopathy shows varied clinical features and onset ages, with missense mutations linked to more severe outcomes. Other factors beyond the dysferlin gene may influence disease progression.
Area of Science:
- Neurology
- Genetics
- Molecular Biology
Background:
- Dysferlinopathy is a group of inherited neuromuscular disorders.
- It is caused by mutations in the dysferlin gene.
- Clinical presentation is highly variable.
Purpose of the Study:
- To investigate the clinical heterogeneity of dysferlinopathy.
- To explore the genotype-phenotype correlation in dysferlinopathy patients.
Main Methods:
- A literature review was conducted.
- Clinical data from 74 dysferlinopathy patients with known dysferlin gene mutations were analyzed.
- Phenotypic differences were categorized based on initial muscle involvement.
Main Results:
- Onset age ranged from 12 to 59 years (mean 21.7).
- Four subtypes were identified: limb-girdle, Miyoshi's, distal anterior compartment, and scapuloperoneal.
- Missense mutations correlated with worse functional status and higher creatine kinase levels compared to frameshift/nonsense mutations.
Conclusions:
- Dysferlinopathy presents significant heterogeneity in onset, muscle involvement, and progression.
- Intrafamilial variability suggests that factors beyond dysferlin mutations influence the disease.