X-linked ectodermal dysplasia with immunodeficiency caused by NEMO mutation: early recognition and diagnosis

Area of Science:

• Genetics and Molecular Biology
• Immunology
• Dermatology

Background:

• X-linked ectodermal dysplasia with immunodeficiency (XL-EDA-ID) is caused by IKBKG gene mutations, affecting the nuclear factor kappaB essential modulator (NEMO).
• Key features include hypohidrosis, dental anomalies, alopecia, and recurrent infections, with early diagnosis in infancy being rare.
• Cutaneous manifestations in these patients are not well-documented.

Observation:

• A 12-week-old male infant presented with severe, persistent skin conditions including intertrigo, atopiclike dermatitis, and erythroderma.
• Physical examination revealed alopecia, frontal bossing, and periorbital wrinkling; family history noted incontinentia pigmenti in the mother.
• Laboratory tests showed leukocytosis with eosinophilia, low immunoglobulin levels (IgG, IgM), absent IgA, and altered lymphocyte subsets.

Findings:

• Genetic analysis identified a frameshift mutation (1167-1168insC) in the IKBKG gene's zinc-finger domain.
• The patient underwent peripheral blood stem cell transplantation, showing initial improvement in skin findings and engraftment, though a second transplant was planned due to diminished cell counts.

Implications:

• NEMO mutations should be suspected in male infants with severe seborrheic or atopic dermatitislike eruptions and intertrigo, particularly with ectodermal dysplasia features.
• Prompt recognition and diagnosis of NEMO mutations are essential to prevent severe immunodeficiency manifestations.
• This case highlights the importance of considering genetic causes for complex dermatological and immunological presentations in infancy.