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Diffuse nonepidermolytic palmoplantar keratoderma caused by a recurrent nonsense mutation in DSG1
Hannah Keren1, Reuven Bergman, Mordechai Mizrachi
1Department of Dermatology and Laboratory of Molecular Dermatology, Rambam Medical Center, Haifa, Israel.
Archives of Dermatology
|May 18, 2005
Summary
Mutations in the DSG1 gene cause a diffuse, non-striated form of palmoplantar keratoderma, expanding the known spectrum of this genetic skin disorder. This finding highlights the importance of comprehensive genetic testing for accurate diagnosis.
Area of Science:
- Genetics
- Dermatology
- Molecular Biology
Background:
- Autosomal dominant keratoderma palmoplantaris striata is linked to mutations in desmosomal protein genes, including desmoglein 1 (DSG1) and desmoplakin.
- Palmoplantar keratoderma (PPK) presents a spectrum of clinical and genetic subtypes.
Observation:
- A family presented with a diffuse, non-striated variant of palmoplantar keratoderma.
- Histopathology revealed suprabasal epidermal cell-cell disadhesion, a feature also seen in striated PPK.
- Linkage analysis and haplotype screening identified a disease locus at 18q12.1, implicating the DSG1 gene.
Findings:
- A recurrent nonsense mutation in the DSG1 gene was identified as the causative mutation for the diffuse non-striated PPK in this family.
- This mutation disrupts desmoglein 1 function, leading to epidermal cell adhesion defects.
- The genetic basis of PPK is more diverse than previously recognized.
Implications:
- Mutations in DSG1 are associated with both striated and non-striated forms of palmoplantar keratoderma.
- An integrated diagnostic strategy combining clinical, pathological, and molecular analyses is crucial for diagnosing PPK subtypes.
- This study expands the genotypic and phenotypic spectrum of DSG1-related palmoplantar keratoderma.