What role does MC4R play in Allergie?

The provided knowledge contexts contain no information on MC4R (melanocortin 4 receptor) and allergies. MC4R is primarily known for its role in energy homeostasis and appetite regulation; loss-of-function mutations cause monogenic obesity. Some preclinical research suggests melanocortins may modulate immune responses, e.g., by exerting anti-inflammatory effects on mast cells and T cells. However, a direct, clinically relevant link between MC4R variants and allergic conditions (hay fever, asthma, atopic dermatitis) is not established. The evidence is purely mechanistic, based on animal models or in vitro data. Human association studies are scarce or inconsistent. Therefore, genetic risk assessment for allergies based on MC4R is currently not actionable. Consumers should not rely on single-gene variants but on established clinical and environmental factors (family history, allergy testing, exposure avoidance). Evidence grade: unclear/mechanistic.