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IgE antibody specific to galactose-α-1,3-galactose

Molecular classification: Antibody (Immunoglobulin E), Allergen-specific antibody, Immune effector molecule

Overview

IgE antibody specific to galactose-α-1,3-galactose (alpha-gal) recognizes the carbohydrate epitope found on glycoproteins and glycolipids of non-primate mammals. Alpha-gal-specific IgE is neither present nor induced under normal circumstances in humans, but can arise after tick bites, leading to a delayed form of food allergy ("alpha-gal syndrome") characterized by potentially severe allergic reactions after consuming mammalian meat or alpha-gal-containing medications (such as cetuximab). Measurement of these IgE antibodies is used diagnostically to confirm sensitization and risk[4][5][6]. Note: The molecule is not a "receptor", "enzyme", or traditional drug target, but it is a clinically relevant immunological target (antibody class) implicated in pathogenesis and diagnosis of a unique allergy syndrome.

Other names: IgE antibody to alpha-galIgE to galactose-α-1,3-galactoseAnti-alpha-gal IgEIgE anti-Galili antigen

Mechanism of action

IgE-mediated hypersensitivity: Drugs containing alpha-gal (e.g., cetuximab) or foods containing alpha-gal (e.g., mammalian meats) bind to anti-alpha-gal IgE on mast cells/basophils, causing degranulation and allergic symptoms[4][5].

Biological functions

Immune responseType I hypersensitivity (allergic response)

Disease associations

Allergy (specifically, alpha-gal syndrome/red meat allergy)AnaphylaxisOther (acts as a biomarker/mediator in allergic disease rather than direct pathogen)

Safety considerations

Delayed-onset anaphylaxis after mammalian meat ingestion (up to 6 hours after exposure) [4][5][6]Severe, sometimes life-threatening, allergic responses including urticaria, angioedema, and shock [5][6]Misdiagnosis with other food allergies due to atypical delayed presentation [5]Risk of reaction to pharmaceuticals containing alpha-gal (notably cetuximab) [4][5]

Interacting drugs

Cetuximab (not a "drug target" per se, but this drug's allergenicity is mediated by presence of alpha-gal and detected by IgE[4][5][6])

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Biomarkers

Serum anti-galactose-α-1,3-galactose IgE (diagnostic for alpha-gal syndrome) [6][5]Clinical history of delayed allergic reactions after mammalian meat consumptionIncreased serum tryptase (in severe reactions/anaphylaxis) [5]

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