Atopic endotype in childhood.

Area of Science:

• Pediatric Allergy and Immunology
• Respiratory Medicine
• Dermatology

Background:

• Atopic disorder is an early concept for classifying children with asthma, eczema, or both, often linked to elevated IgE.
• Understanding distinct endotypes is crucial for targeted treatment strategies in pediatric allergic diseases.

Purpose of the Study:

• To longitudinally analyze the relevance of the atopic endotype from birth to 13 years of age.
• To investigate the temporal relationships between allergic sensitization, asthma, and eczema in children.

Main Methods:

• Longitudinal assessment of allergic sensitization to 28 allergens (skin prick tests, specific IgE) at multiple ages (0.5 to 13 years).
• Longitudinal diagnosis of asthma and eczema using predefined algorithms in 399 children.
• Statistical analysis using logistic regression and machine learning to identify phenotype clusters.

Main Results:

• Allergic sensitization showed no association with asthma in early childhood (0-6 years) but was associated by age 13.
• Sensitization was associated with eczema from infancy to 6 years but not at 13 years.
• Four latent patterns of disease development were identified: sensitization-dominant, eczema-dominant, asthma-dominant, and healthy.

Conclusions:

• Interdependency between asthma, eczema, and allergic sensitization in children is minimal and age-dependent.
• The association strength varies by age, allergen type, and sensitization testing method.
• Current evidence suggests atopy in children may not represent a distinct, stable endotype.