Profound differences in IgE and IgG recognition of micro-arrayed allergens in hyper-IgE syndromes

Area of Science:

• Immunology
• Genetics

Background:

• Specificities of IgE and IgG for allergens in inborn errors of immunity (IEI) are not well understood.
• Hyper-IgE syndromes (HIES) represent a group of IEI with significant immune dysregulation.

Purpose of the Study:

• To investigate IgE and IgG antibody specificities against a broad range of allergens in patients with HIES.
• To compare allergen-specific antibody profiles in patients with PGM3 mutations versus STAT3 mutations.

Main Methods:

• Utilized microarray chips with diverse allergen molecules to analyze IgE and IgG in patient sera.
• Employed basophil activation assays to assess the functional relevance of IgE sensitization.
• Included patients with PGM3 mutations, STAT3 mutations, and allergic controls.

Main Results:

• PGM3 patients exhibited higher total and allergen-specific IgE levels compared to STAT3 patients and controls.
• PGM3 patients showed broader IgE sensitization profiles and confirmed IgE functional relevance via basophil activation.
• PGM3 patients had lower specific IgG responses to milk and egg allergens compared to STAT3 patients and controls.

Conclusions:

• Distinct allergen-specific IgE and IgG recognition patterns exist between PGM3 and STAT3 HIES patients.
• These differences in immune response may offer valuable insights for IEI classification and clinical patient characterization.