This collection of cutting-edge chapters summarizes in depth the state of our knowledge today concerning how cells communicate via G protein-coupled signal transduction and how defects in these proteins and their receptors can cause serious human disease involving many different organ systems. Written by leading investigators, each chapter describes in detail the structure and function of a particular G protein or receptor, lists possible mutations, and discusses fully the molecular pathogenesis of associated diseases. Full advantage is taken of insights from artificially created disorders using transgenic and gene knockout approaches. Diagnostic and therapeutic implications are also discussed where relevant. In its unique blend of basic science and clinical medicine, G Proteins, Receptors, and Disease offers deep insights into the physiological significance of this key signal transduction pathway and into the molecular basis of diseases ranging from obesity to malignancy.