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Galactose-alpha-1,3-galactose syndrome.
1From the Children's Mercy Hospital, Kansas City, Missouri.
Journal of Food Allergy
|July 18, 2024
Summary
Galactose-alpha-1,3-galactose (alpha-Gal) syndrome causes delayed allergic reactions to red meat after tick bites. Diagnosis involves specific IgE testing, and treatment requires meat avoidance and managing tick exposure.
Area of Science:
- Immunology
- Allergology
- Epidemiology
Background:
- The galactose-alpha-1,3-galactose (alpha-Gal) syndrome is an emerging food allergy linked to delayed reactions after consuming mammalian meat.
- Sensitization to alpha-Gal, a carbohydrate found in mammalian tissues, typically occurs following multiple arthropod bites, notably from the lone star tick.
- The geographic distribution of alpha-Gal syndrome cases in the southeastern US correlates with lone star tick prevalence.
Purpose of the Study:
- To describe the characteristics, diagnosis, and management of the galactose-alpha-1,3-galactose (alpha-Gal) syndrome.
- To highlight the association between tick bites, alpha-Gal sensitization, and subsequent allergic reactions to mammalian meat.
- To provide guidance on diagnostic approaches and treatment strategies for this unique food allergy.
Main Methods:
- Diagnostic evaluation based on patient history of delayed reactions post-mammalian meat ingestion (2-6 hours).
- Assessment of alpha-Gal specific IgE (sIgE) levels, considering total IgE values and the percentage of alpha-Gal sIgE.
- Evaluation of skin testing reliability, noting limitations of commercial extracts and potential utility of prick-prick testing with fresh meat.
Main Results:
- Alpha-Gal syndrome presents with symptoms affecting skin, respiratory, gastrointestinal, or cardiovascular systems, ranging from mild to anaphylactic.
- Diagnosis relies on detecting alpha-Gal sIgE, with some patients exhibiting low total IgE but high alpha-Gal sIgE percentages.
- Standard percutaneous testing with commercial meat extracts is unreliable; prick-prick testing with fresh meat may be considered.
Conclusions:
- The primary treatment for alpha-Gal syndrome is strict avoidance of mammalian meat and products containing the alpha-Gal epitope.
- Long-term avoidance of mammalian meat and further tick bites can lead to decreased alpha-Gal sIgE levels, potentially allowing meat reintroduction.
- Some patients may require avoidance of additional meat-containing products if symptoms persist despite mammalian meat exclusion.
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