Monosensitization to a novel plane pollen allergen.

Area of Science:

• Allergen immunotherapy
• Molecular allergology
• Clinical immunology

Background:

• Plane pollen (Platanus) is a common cause of seasonal allergic rhinitis.
• Component-resolved diagnostics (CRD) using the ImmunoSolid-phase Allergen Chip (ISAC) can identify specific IgE reactivity to different pollen allergens.
• Pla a 1 and Pla a 2 are major allergens found in plane tree pollen.

Observation:

• A patient diagnosed with monosensitization to plane pollen was investigated.
• ImmunoSolid-phase Allergen Chip (ISAC) analysis indicated IgE reactivity to both Pla a 1 and Pla a 2.
• Subsequent immunoblot analysis demonstrated a single IgE reactivity band at approximately 50 kDa.

Findings:

• The patient's serum exhibited specific IgE binding to a single protein band of about 50 kDa on immunoblot.
• This suggests that the observed IgE reactivity on ISAC to both Pla a 1 and Pla a 2 might be directed towards a single, common 50 kDa allergen or a cross-reactive epitope.

Implications:

• This case highlights the importance of immunoblotting in clarifying specific IgE reactivity patterns identified by multiplex platforms.
• Understanding the precise allergen targets is crucial for accurate diagnosis and potentially for guiding allergen immunotherapy strategies.
• Further characterization of the 50 kDa allergen is warranted to confirm its identity and clinical relevance in plane pollen allergy.