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In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

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Dyschromatosis universalis hereditaria: two cases.

N Kenani¹, N Ghariani, M Denguezli

¹Department of Dermatology, Chu Farhat Hached Sousse, Tunisia.

Dermatology Online Journal

|August 14, 2008

Summary

Dyschromatosis universalis hereditaria (DUH) is a rare genetic skin disorder. This report details two Tunisian pediatric cases, highlighting clinical and histological findings of this condition.

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Area of Science:

Dermatology
Genetics
Rare Diseases

Background:

Dyschromatosis universalis hereditaria (DUH) is a rare genodermatosis, predominantly reported in Japan, characterized by widespread skin pigmentation abnormalities.
While initially described in Japan, DUH cases have since been documented globally, indicating a broader geographical distribution.
Understanding the clinical spectrum and genetic underpinnings of DUH is crucial for accurate diagnosis and management.

Observation:

Two Tunisian pediatric cases of DUH are presented: a 3-year-old and a 3-month-old girl.
Both patients exhibited asymptomatic, progressive, mottled pigmentation on the trunk and limbs since birth, with palms and soles affected in one case.
Clinical examination revealed generalized hyperpigmented and de-pigmented macules, with normal hair, nails, teeth, and mucosae.

Findings:

Histological examination showed basal layer hypermelanosis with focal pigmentary incontinence, consistent with DUH.
The diagnosis was established based on clinical presentation and histological evidence.
Over a 12-month follow-up, no new lesions appeared in the first child, while the second child developed palmoplantar involvement.

Implications:

This report expands the geographical data on DUH, documenting cases in Tunisia.
The findings underscore the importance of clinical and histological evaluation for diagnosing DUH in diverse populations.
Further research into the genetic basis and long-term progression of DUH is warranted.