Atypical Localization of Eczema Discriminates DOCK8 or STAT3 Deficiencies from Atopic Dermatitis

Area of Science:

• Immunology
• Genetics
• Dermatology

Background:

• Dedicator of cytokinesis 8 (DOCK8) and signal transducer and activator of transcription 3 (STAT3) deficiencies are inborn errors of immunity presenting with eczema, mimicking atopic dermatitis.
• Accurate differentiation is essential for timely and appropriate management of these conditions.

Purpose of the Study:

• To identify clinical and immunological variables for early differentiation of DOCK8 and STAT3 deficiencies from atopic dermatitis in patients with eczema.
• To establish an approach for distinguishing these inborn errors of immunity from atopic dermatitis.

Main Methods:

• A multicenter study involving 100 patients with DOCK8 or STAT3 deficiencies and moderate/severe atopic dermatitis.
• Data collection included disease manifestations, eczema localization, infections, allergies, and lymphocyte subsets (CD3+, CD4+, CD8+).
• Principle component analysis (PCA) was employed to discriminate between DOCK8/STAT3 deficiencies and atopic dermatitis.

Main Results:

• Pneumonia, severe infections, mucocutaneous candidiasis, and skin abscesses were common in DOCK8 and STAT3 deficiencies.
• Atypical eczema localization (neonatal rash, retro auricular, axillary, sacral, genital) showed high specificity (73.5-94.1%) in differentiating DOCK8/STAT3 deficiencies from atopic dermatitis.
• Combined clinical features and lymphocyte subset counts achieved perfect differentiation via PCA.

Conclusions:

• Specific clinical presentations and immunological markers can effectively differentiate DOCK8 and STAT3 deficiencies from atopic dermatitis.
• The identified features are easily implementable for early diagnosis by physicians.
• This approach facilitates timely intervention for patients with these inborn errors of immunity.