What role does HLA-DQ2 play in Allergie?

HLA-DQ2 is a gene variant complex primarily associated with celiac disease (gluten intolerance), an autoimmune condition, not a classic allergy (IgE-mediated). In the provided contexts, HLA-DQ2 is not mentioned in relation to allergies. Some studies explore whether HLA-DQ2 also plays a role in other immune reactions like food allergies or atopic diseases, but the evidence is weak and inconsistent. Most allergies are driven by IgE antibodies against environmental or food allergens, whereas HLA-DQ2 is involved in presenting gluten peptides to T cells. Direct-to-consumer genetic tests sometimes claim that HLA-DQ2 is linked to 'allergies,' but this is misleading. The clinical relevance for allergies is not established. Anyone suspecting an actual allergy should consult an allergist rather than rely on genetic tests.