A novel COL6A2 mutation causing late-onset limb-girdle muscular dystrophy

Area of Science:

• Genetics
• Neurology
• Musculoskeletal Diseases

Background:

• Limb-girdle muscular dystrophies (LGMD) are a group of inherited muscle disorders.
• Collagen VI-related myopathies typically present with generalized muscle weakness, contractures, and distal hyperlaxity.

Observation:

• A Finnish family presented with an unusual LGMD phenotype.
• Affected individuals exhibited late-onset symptoms, appearing between 40-60 years of age.
• The inheritance pattern was autosomal dominant.

Findings:

• Genetic analysis revealed a novel mutation in the COL6A2 gene.
• This mutation resulted in a Collagen VI-related muscular dystrophy with an LGMD-like presentation.
• Characteristic muscle MRI findings were instrumental in diagnosis.

Implications:

• This expands the known spectrum of Collagen VI-related myopathies.
• It highlights the importance of muscle MRI in diagnosing rare genetic muscle disorders.
• The findings suggest COL6A2 mutations can cause late-onset LGMD.