– NR3C1 (Nuclear Receptor Subfamily 3 Group C Member 1) is a Protein Coding gene. This gene encodes glucocorticoid receptor, which can function both as a transcription factor that binds to glucocorticoid response elements in the promoters of glucocorticoid responsive genes to activate their transcription, and as a regulator of other transcription factors. NR3C1 is a transcriptional regulator of many drug-metabolizing enzymes and anti-inflammatory molecules. NR3C1 polymorphisms associate with obesity, muscle strength, and cortisol sensitivity. Glucocorticoid receptor gene polymorphism (NR3C1 646 C>G) may play an important role in the development of severe bronchial asthma and resistance to glucocorticoids (GCs). Disturbances in the structure and function of the glucocorticoid receptor (GR) alter the glucocorticoid regulation of the corticotropin-releasing hormone, which leads to nonspecific activation of numerous receptors in the brain and alters the metabolism.