Hyperimmunoglobulin E syndromes in pediatrics.

Area of Science:

• Immunology
• Genetics
• Clinical Medicine

Background:

• Hyper-IgE syndromes (HIES) are primary immunodeficiencies marked by eczema, recurrent sinopulmonary infections, and high serum IgE levels.
• HIES presents clinically with overlapping features but distinct underlying genetic causes and disease mechanisms.
• Understanding these differences is crucial for accurate diagnosis and effective patient management.

Purpose of the Study:

• To review the clinical similarities and differences between autosomal dominant HIES (AD-HIES) and autosomal recessive HIES (AR-HIES).
• To discuss the causative genetic defects and pathophysiological mechanisms underlying different forms of HIES.
• To highlight the importance of molecular diagnosis for optimal patient care.

Main Methods:

• Review of recent scientific literature on HIES genetics and pathophysiology.
• Comparison of clinical manifestations and infectious profiles between AD-HIES and AR-HIES.
• Analysis of identified genetic mutations (STAT3, DOCK8, TYK2) and their functional consequences.

Main Results:

• STAT3 mutations are linked to AD-HIES, while DOCK8 and TYK2 mutations are associated with AR-HIES.
• Reduced T helper 17 cell counts can predict STAT3 mutations.
• DOCK8 deficiency impairs T cell expansion and B cell antibody production, contributing to susceptibility to viral infections, allergies, and malignancies in AR-HIES.

Conclusions:

• Molecular diagnosis is essential for tailoring HIES patient management.
• AD-HIES infections are generally manageable with antibiotics.
• AR-HIES presents significant challenges with viral infections and has higher mortality, necessitating early identification for potential hematopoietic cell transplantation.