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An intronless gene encoding an additional human serotonin (5-HT) 5-HT1-like receptor subtype was isolated from a human genomic library with probes obtained from degenerate PCR primers used to amplify 5-HT-receptor-specific sequences. The highest degree of homology was found with the 5-HT1E subtype (70%) and the 5-HT1D alpha (63%) and 5-HT1D beta (60%) receptors. RNA for this gene was detected in the human brain but was not detected in kidney, liver, spleen, heart, pancreas, and testes. High-affinity (Kd = 9.2 nM) 3H-labeled 5-HT binding was detected. Competition studies revealed the following rank order of potencies for serotonergic ligands: 5-HT &gt; sumatriptan &gt;&gt; 5-carboxyamidotryptamine &gt; 8-hydroxy-2(di-1-propylamino)tetralin &gt; spiperone. 5-HT produced a dose-dependent inhibition of forskolin-stimulated cAMP accumulation (EC50 = 7.9 nM) in transfected cells. These properties distinguish this receptor from any previously characterized and establish a fifth 5-HT1-like receptor subtype (5-HT1F) coupled to the inhibition of adenylate cyclase.

Cloning of another human serotonin receptor (5-HT1F): a fifth 5-HT1 receptor subtype coupled to the inhibition of adenylate cyclase.