NR3C1 (Nuclear Receptor Subfamily 3 Group C Member 1): NR3C1 is a gene that encodes the glucocorticoid receptor, which mediates the actions of glucocorticoids — a class of steroid hormones. This receptor is essential for regulating stress responses, immune activity, and metabolism. Dysregulation of NR3C1 has been linked to stress-related disorders, inflammatory conditions, and metabolic diseases, making it a key player in the body’s adaptation to stress and inflammation.