Expanding horizons for receptors coupled to G proteins: diversity and disease.

The known repertoire of seven transmembrane domain receptors coupled to G proteins has expanded in several interesting directions. Both loss-of-function and activating mutations have been found at the root of a variety of diseases. More will undoubtedly be uncovered. The diversity of ligands which trigger G protein coupled receptors continues to grow, and with it the variety of known strategies for ligand detection. These and other developments promise continued excitement in this field.