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Mutations in GPR101 as a potential cause of X-linked acrogigantism and acromegaly.
X-linked acrogigantism (XLAG) is a recently described early-onset gigantism due to GPR101 duplication that induces growth hormone (GH) oversecretion. GPR101, which belongs to Family A rhodopsin-like family of G protein-coupled receptors, is predominantly expressed in hypothalamus and pituitary, suggesting that GPR101 might be important in regulating diverse functions such as energy balance and reproduction. Most mammalian GPR101s have extremely long third intracellular loops (ICL3); however, zebrafish GPR101 has a much shorter ICL3, but a longer C-terminus. GnRH-(1-5), a GnRH metabolite, can modulate the hypothalamus-pituitary-gonad axis and cancer cell migration via activating GPR101. GPR101 couples to both Gαs and Gαi proteins. GPR101 duplication has a causative role in XLAG, while GPR101 variants, especially c.924G>C (E308D), located at ICL3, are attributed to acromegaly. Some GPR101 mutations that are associated with a small proportion of pituitary tumors without GH oversecretion have also been identified recently. This chapter will summarize studies on GPR101, including its molecular cloning and tissue distribution, physiology, pharmacology, and pathophysiology.
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