Is FUT2 useful for Allergie?

The question of whether FUT2 is useful for allergies cannot be directly answered from the provided context. FUT2 determines secretor status, which influences mucosal immunity and gut microbiome composition. Some studies link non-secretor status (e.g., rs601338 A allele) to increased risk of allergic conditions like hay fever and eczema, especially in children. However, the associations are modest and vary by population and environment. FUT2 is not a diagnostic tool; it is one of many genetic factors. For personalized allergy management, combining genetic data with clinical history, IgE levels, and microbiome testing is more informative. Evidence level: human-moderate (observational studies, no strong causal proof). Caveat: Lifestyle and diet have greater impact. No direct clinical action is warranted based solely on FUT2 genotype.