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Type 2 segmental Darier disease.

R Happle1, P H Itin, A M Brun

  • 1Department of Dermatology, University of Marburg, Deutschhausstrasse 9, 35033 Marburg, Germany. happle@mailer.uni-marburg.de

European Journal of Dermatology : EJD
|September 24, 1999
PubMed
Summary
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This study presents a rare case of Darier disease with a unique segmental pattern. The findings suggest a new classification, type 2 segmental Darier disease, potentially linked to genetic mutations.

Area of Science:

  • Dermatology
  • Genetics
  • Medical Science

Background:

  • Darier disease is a rare autosomal dominant genodermatosis.
  • Segmental Darier disease is an uncommon variant, often attributed to somatic mosaicism.

Observation:

  • A 45-year-old man presented with typical disseminated Darier disease and a distinct unilateral, systematized, segmental pattern of more severe lesions.
  • His two sisters also exhibited features suggestive of Darier disease.

Findings:

  • The case is proposed as an example of type 2 segmental Darier disease.
  • Type 2 segmental involvement is hypothesized to arise from postzygotic loss of the normal allele in a heterozygous embryo, leading to homozygous or hemizygous cells for the mutation.
  • This mechanism could explain the exaggerated and superimposed nature of the segmental lesions.

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Implications:

  • This case expands the understanding of Darier disease phenotypes and genetic mechanisms.
  • It proposes a novel classification for segmental Darier disease, differentiating it from type 1.
  • Further molecular studies are warranted to validate the proposed mechanism for type 2 segmental Darier disease.