FCER1A (High Affinity Immunoglobulin E Receptor Subunit Alpha) is a gene that encodes a protein essential for allergic reactions. It binds to immunoglobulin E (IgE) and activates mast cells and basophils, triggering the release of histamine and other inflammatory mediators. This process contributes to allergy and asthma symptoms, making FCER1A a key target for therapies aimed at reducing allergic responses.