Pistachio Allergy: Integrating Molecular Diagnostics and Clinical Phenotypes

Area of Science:

• Allergy and Immunology
• Food Allergy Research
• Diagnostic Medicine

Background:

• Pistachio allergy is a growing concern within tree nut allergies, often linked to cashew allergy due to molecular cross-reactivity.
• While not highly prevalent, pistachio allergy can cause severe reactions and poses diagnostic difficulties, especially in patients with multiple allergies.

Purpose of the Study:

• To review and assess current diagnostic methods for pistachio allergy.
• Focus on molecular allergens, cross-reactivity, clinical patterns, and advanced tools for risk assessment.

Main Methods:

• A narrative literature review was performed, synthesizing data from various studies.
• Included population studies, clinical cohorts, component-resolved diagnostics, basophil activation tests, and oral food challenges.
• Evaluated extract-based, molecular, and functional assays for diagnostic performance.

Main Results:

• Pistachio allergy is often linked to sensitization to 2S albumins, 7S vicilins, and 11S legumins, similar to cashew allergens, explaining cross-reactivity.
• Standard extract tests lack specificity; component-resolved diagnostics and functional assays offer greater precision.
• These advanced methods aid in risk stratification and may reduce the need for oral food challenges.

Conclusions:

• An integrated diagnostic approach combining clinical history with molecular and functional tests is crucial for pistachio allergy.
• Component-resolved diagnostics and basophil activation testing enhance the differentiation between sensitization and clinical allergy.
• These tools support personalized patient management and safer clinical decisions.