Structure of the human M(2) muscarinic acetylcholine receptor gene and its promoter.
The M(2) muscarinic receptor inhibits the release of acetylcholine from cholinergic fibers in the lungs and elsewhere. In airway parasympathetic neurons, M(2) receptor expression is decreased by viral infections and by interferon-gamma, increasing actylcholine release. Dexamethasone increases M(2) receptor expression, decreasing acetylcholine release. We carried out 5' rapid amplification of cDNA ends beginning with mRNA from human heart and IMR32 human neuroblastoma cells. This demonstrated a 5' UTR of 100 BP, corresponding to two sequences on chromosome 7, separated by a 22.6 kB intron. The splice acceptor site is at -45 relative to the initiating atg. The 3000 BP upstream of 5' RACE product were subcloned into a pGL3 luciferase reporter vector. Deletional constructs were expressed in IMR32 cells. These demonstrated that 412 BP provided full expression of the reporter gene, and suggested a repressor element between -1848 and -1510.
Zhou
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C
Division of Pulmonary and Critical Care Medicine, School of Medicine, Johns Hopkins University, 615 North Wolfe Street, Baltimore, MD 21205, USA.
Fryer
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AD
Jacoby
D B
DB
D001483:Base Sequence; D004247:DNA / Q000737:chemistry / Q000235:genetics; D005786:Gene Expression Regulation; D005796:Genes / Q000235:genetics*; D015698:Genomic Library; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics*; D043585:Receptor, Muscarinic M2; D011976:Receptors, Muscarinic / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion; D014407:Tumor Cells, Cultured
D043585:Receptor, Muscarinic M2; D011976:Receptors, Muscarinic; D011993:Recombinant Fusion Proteins; D004247:DNA; D008156:Luciferases