How are HLA-DQ2 and allergy related?

HLA-DQ2 is a genetic variant complex strongly associated with celiac disease (an autoimmune disorder), not with classic allergies (e.g., pollen or food allergy of the IgE type). Some studies explore a possible link between HLA-DQ2 and atopic conditions like asthma or eczema, but the evidence is weak and inconsistent. Most associations are based on mechanistic hypotheses or small observational studies. Therefore, a DNA test for HLA-DQ2 cannot diagnose allergies or reliably predict allergy risk. The clinical relevance for allergies remains unclear. If an allergy is suspected, specific IgE tests and medical evaluation are required. Be cautious of marketing claims that label HLA-DQ2 as an 'allergy gene'.