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Variable pathogenic potentials of mutations located in the desmin alpha-helical domain
Bertrand Goudeau1, Fernando Rodrigues-Lima, Dirk Fischer
1EA300, Université Paris 7 Denis Diderot, Paris, France.
Human Mutation
|July 26, 2006
Summary
Desmin mutations cause desminopathy, leading to muscle weakness. Specific mutations in the desmin alpha-helical domain can impair filament function and cause disease, with severity depending on mutation type and location.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Desminopathy is a muscle disorder caused by mutations in the desmin gene (DES).
- Histopathology reveals abnormal desmin accumulation within cells.
- Understanding genotype-phenotype correlations is crucial for diagnosis and treatment.
Observation:
- This study analyzed seven desmin mutations, focusing on the alpha-helical domain.
- Four novel and three previously reported mutations were characterized.
- Mutations were assessed for their phenotypic, molecular, and functional impacts.
Findings:
- Certain mutations (e.g., p.A213V, p.N393I) are conditionally pathogenic, requiring combination with other genetic factors.
- Other mutations (e.g., p.A337P, p.L338R, p.D399Y, p.E401K) directly impair desmin filament function and cause disease.
- Pathogenicity correlates with mutation type and location within the desmin molecule, particularly in the alpha-helical domain.
Implications:
- The integrity of the desmin alpha-helix is critical for filament assembly and stability.
- Identifying specific pathogenic mutations aids in understanding disease mechanisms.
- This research contributes to the genetic basis of desminopathies and related muscle disorders.
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